path: root/external/easylogging++/easylogging++.h

//
//  Bismillah ar-Rahmaan ar-Raheem
//
//  Easylogging++ v9.84
//  Single-header only, cross-platform logging library for C++ applications
//
//  Copyright (c) 2016 muflihun.com
//
//  This library is released under the MIT Licence.
//  http://easylogging.muflihun.com/licence.php
//
//  easylogging@muflihun.com
//
//  https://github.com/easylogging/easyloggingpp
//  http://easylogging.muflihun.com
//  http://muflihun.com
//
#ifndef EASYLOGGINGPP_H
#define EASYLOGGINGPP_H
// Compilers and C++0x/C++11 Evaluation
#if (defined(__GNUC__))
#   define ELPP_COMPILER_GCC 1
#else
#   define ELPP_COMPILER_GCC 0
#endif
#if ELPP_COMPILER_GCC
#    define ELPP_GCC_VERSION (__GNUC__ * 10000 \
+ __GNUC_MINOR__ * 100 \
+ __GNUC_PATCHLEVEL__)
#   if defined(__GXX_EXPERIMENTAL_CXX0X__)
#      define ELPP_CXX0X 1
#   elif(ELPP_GCC_VERSION >= 40801)
#      define ELPP_CXX11 1
#   endif
#endif
// Visual C++
#if defined(_MSC_VER)
#   define ELPP_COMPILER_MSVC 1
#else
#   define ELPP_COMPILER_MSVC 0
#endif
#define ELPP_CRT_DBG_WARNINGS ELPP_COMPILER_MSVC
#if ELPP_COMPILER_MSVC
#   if (_MSC_VER == 1600)
#      define ELPP_CXX0X 1
#   elif(_MSC_VER >= 1700)
#      define ELPP_CXX11 1
#   endif
#endif
// Clang++
#if (defined(__clang__) && (__clang__ == 1))
#   define ELPP_COMPILER_CLANG 1
#else
#   define ELPP_COMPILER_CLANG 0
#endif
#if ELPP_COMPILER_CLANG
#   define ELPP_CLANG_VERSION (__clang_major__ * 10000 \
+ __clang_minor__ * 100 \
+ __clang_patchlevel__)
#   if (ELPP_CLANG_VERSION >= 30300)
#      define ELPP_CXX11 1
#   endif  // (ELPP_CLANG_VERSION >= 30300)
#endif
#if (defined(__MINGW32__) || defined(__MINGW64__))
#   define ELPP_MINGW 1
#else
#   define ELPP_MINGW 0
#endif
#if (defined(__CYGWIN__) && (__CYGWIN__ == 1))
#   define ELPP_CYGWIN 1
#else
#   define ELPP_CYGWIN 0
#endif
#if (defined(__INTEL_COMPILER))
#   define ELPP_COMPILER_INTEL 1
#else
#   define ELPP_COMPILER_INTEL 0
#endif
// Operating System Evaluation
// Windows
#if (defined(_WIN32) || defined(_WIN64))
#   define ELPP_OS_WINDOWS 1
#else
#   define ELPP_OS_WINDOWS 0
#endif
// Linux
#if (defined(__linux) || defined(__linux__))
#   define ELPP_OS_LINUX 1
#else
#   define ELPP_OS_LINUX 0
#endif
#if (defined(__APPLE__))
#   define ELPP_OS_MAC 1
#else
#   define ELPP_OS_MAC 0
#endif
#if (defined(__FreeBSD__))
#   define ELPP_OS_FREEBSD 1
#else
#   define ELPP_OS_FREEBSD 0
#endif
#if (defined(__sun))
#   define ELPP_OS_SOLARIS 1
#else
#   define ELPP_OS_SOLARIS 0
#endif
// Unix
#if ((ELPP_OS_LINUX || ELPP_OS_MAC || ELPP_OS_FREEBSD || ELPP_OS_SOLARIS) && (!ELPP_OS_WINDOWS))
#   define ELPP_OS_UNIX 1
#else
#   define ELPP_OS_UNIX 0
#endif
#if (defined(__ANDROID__))
#   define ELPP_OS_ANDROID 1
#else
#   define ELPP_OS_ANDROID 0
#endif
// Evaluating Cygwin as *nix OS
#if !ELPP_OS_UNIX && !ELPP_OS_WINDOWS && ELPP_CYGWIN
#   undef ELPP_OS_UNIX
#   undef ELPP_OS_LINUX
#   define ELPP_OS_UNIX 1
#   define ELPP_OS_LINUX 1
#endif //  !ELPP_OS_UNIX && !ELPP_OS_WINDOWS && ELPP_CYGWIN
#if !defined(ELPP_INTERNAL_DEBUGGING_OUT_INFO)
#   define ELPP_INTERNAL_DEBUGGING_OUT_INFO std::cout
#endif // !defined(ELPP_INTERNAL_DEBUGGING_OUT)
#if !defined(ELPP_INTERNAL_DEBUGGING_OUT_ERROR)
#   define ELPP_INTERNAL_DEBUGGING_OUT_ERROR std::cerr
#endif // !defined(ELPP_INTERNAL_DEBUGGING_OUT)
#if !defined(ELPP_INTERNAL_DEBUGGING_ENDL)
#   define ELPP_INTERNAL_DEBUGGING_ENDL std::endl
#endif // !defined(ELPP_INTERNAL_DEBUGGING_OUT)
#if !defined(ELPP_INTERNAL_DEBUGGING_MSG)
#   define ELPP_INTERNAL_DEBUGGING_MSG(msg) msg
#endif // !defined(ELPP_INTERNAL_DEBUGGING_OUT)
// Internal Assertions and errors
#if !defined(ELPP_DISABLE_ASSERT)
#   if (defined(ELPP_DEBUG_ASSERT_FAILURE))
#      define ELPP_ASSERT(expr, msg) if (!(expr)) { \
std::stringstream internalInfoStream; internalInfoStream << msg; \
ELPP_INTERNAL_DEBUGGING_OUT_ERROR \
<< "EASYLOGGING++ ASSERTION FAILED (LINE: " << __LINE__ << ") [" #expr << "] WITH MESSAGE \"" \
<< ELPP_INTERNAL_DEBUGGING_MSG(internalInfoStream.str()) << "\"" << ELPP_INTERNAL_DEBUGGING_ENDL; base::utils::abort(1, \
"ELPP Assertion failure, please define ELPP_DEBUG_ASSERT_FAILURE"); }
#   else
#      define ELPP_ASSERT(expr, msg) if (!(expr)) { \
std::stringstream internalInfoStream; internalInfoStream << msg; \
ELPP_INTERNAL_DEBUGGING_OUT_ERROR\
<< "ASSERTION FAILURE FROM EASYLOGGING++ (LINE: " \
<< __LINE__ << ") [" #expr << "] WITH MESSAGE \"" << ELPP_INTERNAL_DEBUGGING_MSG(internalInfoStream.str()) << "\"" \
<< ELPP_INTERNAL_DEBUGGING_ENDL; }
#   endif  // (defined(ELPP_DEBUG_ASSERT_FAILURE))
#else
#   define ELPP_ASSERT(x, y)
#endif  //(!defined(ELPP_DISABLE_ASSERT)
#if ELPP_COMPILER_MSVC
#   define ELPP_INTERNAL_DEBUGGING_WRITE_PERROR \
{ char buff[256]; strerror_s(buff, 256, errno); \
ELPP_INTERNAL_DEBUGGING_OUT_ERROR << ": " << buff << " [" << errno << "]";} (void)0
#else
#   define ELPP_INTERNAL_DEBUGGING_WRITE_PERROR \
ELPP_INTERNAL_DEBUGGING_OUT_ERROR << ": " << strerror(errno) << " [" << errno << "]"; (void)0
#endif  // ELPP_COMPILER_MSVC
#if defined(ELPP_DEBUG_ERRORS)
#   if !defined(ELPP_INTERNAL_ERROR)
#      define ELPP_INTERNAL_ERROR(msg, pe) { \
std::stringstream internalInfoStream; internalInfoStream << "<ERROR> " << msg; \
ELPP_INTERNAL_DEBUGGING_OUT_ERROR \
<< "ERROR FROM EASYLOGGING++ (LINE: " << __LINE__ << ") " \
<< ELPP_INTERNAL_DEBUGGING_MSG(internalInfoStream.str()) << ELPP_INTERNAL_DEBUGGING_ENDL; \
if (pe) { ELPP_INTERNAL_DEBUGGING_OUT_ERROR << "    "; ELPP_INTERNAL_DEBUGGING_WRITE_PERROR; }} (void)0
#   endif
#else
#   undef ELPP_INTERNAL_INFO
#   define ELPP_INTERNAL_ERROR(msg, pe)
#endif  // defined(ELPP_DEBUG_ERRORS)
#if (defined(ELPP_DEBUG_INFO))
#   if !(defined(ELPP_INTERNAL_INFO_LEVEL))
#      define ELPP_INTERNAL_INFO_LEVEL 9
#   endif  // !(defined(ELPP_INTERNAL_INFO_LEVEL))
#   if !defined(ELPP_INTERNAL_INFO)
#      define ELPP_INTERNAL_INFO(lvl, msg) { if (lvl <= ELPP_INTERNAL_INFO_LEVEL) { \
std::stringstream internalInfoStream; internalInfoStream << "<INFO> " << msg; \
ELPP_INTERNAL_DEBUGGING_OUT_INFO << ELPP_INTERNAL_DEBUGGING_MSG(internalInfoStream.str()) \
<< ELPP_INTERNAL_DEBUGGING_ENDL; }}
#   endif
#else
#   undef ELPP_INTERNAL_INFO
#   define ELPP_INTERNAL_INFO(lvl, msg)
#endif  // (defined(ELPP_DEBUG_INFO))
#if defined(ELPP_STACKTRACE_ON_CRASH)
#   if (ELPP_COMPILER_GCC && !ELPP_MINGW)
#      define ELPP_STACKTRACE 1
#   else
#      if ELPP_COMPILER_MSVC
#         pragma message("Stack trace not available for this compiler")
#      else
#         warning "Stack trace not available for this compiler";
#      endif  // ELPP_COMPILER_MSVC
#   endif  // ELPP_COMPILER_GCC
#endif  // (defined(ELPP_STACKTRACE_ON_CRASH))
// Miscellaneous macros
#define ELPP_UNUSED(x) (void)x
#if ELPP_OS_UNIX
// Log file permissions for unix-based systems
#   define ELPP_LOG_PERMS S_IRUSR | S_IWUSR | S_IXUSR | S_IWGRP | S_IRGRP | S_IXGRP | S_IWOTH | S_IXOTH
#endif  // ELPP_OS_UNIX
#if defined(ELPP_AS_DLL) && ELPP_COMPILER_MSVC
#   if defined(ELPP_EXPORT_SYMBOLS)
#      define ELPP_EXPORT __declspec(dllexport)
#   else
#      define ELPP_EXPORT __declspec(dllimport)
#   endif  // defined(ELPP_EXPORT_SYMBOLS)
#else
#   define ELPP_EXPORT
#endif  // defined(ELPP_AS_DLL) && ELPP_COMPILER_MSVC
// Some special functions that are VC++ specific
#undef STRTOK
#undef STRERROR
#undef STRCAT
#undef STRCPY
#if ELPP_CRT_DBG_WARNINGS
#   define STRTOK(a, b, c) strtok_s(a, b, c)
#   define STRERROR(a, b, c) strerror_s(a, b, c)
#   define STRCAT(a, b, len) strcat_s(a, len, b)
#   define STRCPY(a, b, len) strcpy_s(a, len, b)
#else
#   define STRTOK(a, b, c) strtok(a, b)
#   define STRERROR(a, b, c) strerror(c)
#   define STRCAT(a, b, len) strcat(a, b)
#   define STRCPY(a, b, len) strcpy(a, b)
#endif
// Compiler specific support evaluations
#if ((!ELPP_MINGW && !ELPP_COMPILER_CLANG) || defined(ELPP_FORCE_USE_STD_THREAD))
#   define ELPP_USE_STD_THREADING 1
#else
#   define ELPP_USE_STD_THREADING 0
#endif
#undef ELPP_FINAL
#if ELPP_COMPILER_INTEL || (ELPP_GCC_VERSION < 40702)
#   define ELPP_FINAL
#else
#   define ELPP_FINAL final
#endif  // ELPP_COMPILER_INTEL || (ELPP_GCC_VERSION < 40702)
#if defined(ELPP_EXPERIMENTAL_ASYNC)
#   define ELPP_ASYNC_LOGGING 1
#else
#   define ELPP_ASYNC_LOGGING 0
#endif // defined(ELPP_EXPERIMENTAL_ASYNC)
#if defined(ELPP_THREAD_SAFE) || ELPP_ASYNC_LOGGING
#   define ELPP_THREADING_ENABLED 1
#else
#   define ELPP_THREADING_ENABLED 0
#endif  // defined(ELPP_THREAD_SAFE) || ELPP_ASYNC_LOGGING
// Function macro ELPP_FUNC
#undef ELPP_FUNC
#if ELPP_COMPILER_MSVC  // Visual C++
#   define ELPP_FUNC __FUNCSIG__
#elif ELPP_COMPILER_GCC  // GCC
#   define ELPP_FUNC __PRETTY_FUNCTION__
#elif ELPP_COMPILER_INTEL  // Intel C++
#   define ELPP_FUNC __PRETTY_FUNCTION__
#elif ELPP_COMPILER_CLANG  // Clang++
#   define ELPP_FUNC __PRETTY_FUNCTION__
#else
#   if defined(__func__)
#      define ELPP_FUNC __func__
#   else
#      define ELPP_FUNC ""
#   endif  // defined(__func__)
#endif  // defined(_MSC_VER)
#undef ELPP_VARIADIC_TEMPLATES_SUPPORTED
// Keep following line commented until features are fixed
#define ELPP_VARIADIC_TEMPLATES_SUPPORTED \
(ELPP_COMPILER_GCC || ELPP_COMPILER_CLANG || ELPP_COMPILER_INTEL || (ELPP_COMPILER_MSVC && _MSC_VER >= 1800))
// Logging Enable/Disable macros
#define ELPP_LOGGING_ENABLED (!defined(ELPP_DISABLE_LOGS))
#if (!defined(ELPP_DISABLE_DEBUG_LOGS) && (ELPP_LOGGING_ENABLED) && ((defined(_DEBUG)) || (!defined(NDEBUG))))
#   define ELPP_DEBUG_LOG 1
#else
#   define ELPP_DEBUG_LOG 0
#endif  // (!defined(ELPP_DISABLE_DEBUG_LOGS) && (ELPP_LOGGING_ENABLED) && ((defined(_DEBUG)) || (!defined(NDEBUG))))
#if (!defined(ELPP_DISABLE_INFO_LOGS) && (ELPP_LOGGING_ENABLED))
#   define ELPP_INFO_LOG 1
#else
#   define ELPP_INFO_LOG 0
#endif  // (!defined(ELPP_DISABLE_INFO_LOGS) && (ELPP_LOGGING_ENABLED))
#if (!defined(ELPP_DISABLE_WARNING_LOGS) && (ELPP_LOGGING_ENABLED))
#   define ELPP_WARNING_LOG 1
#else
#   define ELPP_WARNING_LOG 0
#endif  // (!defined(ELPP_DISABLE_WARNING_LOGS) && (ELPP_LOGGING_ENABLED))
#if (!defined(ELPP_DISABLE_ERROR_LOGS) && (ELPP_LOGGING_ENABLED))
#   define ELPP_ERROR_LOG 1
#else
#   define ELPP_ERROR_LOG 0
#endif  // (!defined(ELPP_DISABLE_ERROR_LOGS) && (ELPP_LOGGING_ENABLED))
#if (!defined(ELPP_DISABLE_FATAL_LOGS) && (ELPP_LOGGING_ENABLED))
#   define ELPP_FATAL_LOG 1
#else
#   define ELPP_FATAL_LOG 0
#endif  // (!defined(ELPP_DISABLE_FATAL_LOGS) && (ELPP_LOGGING_ENABLED))
#if (!defined(ELPP_DISABLE_TRACE_LOGS) && (ELPP_LOGGING_ENABLED))
#   define ELPP_TRACE_LOG 1
#else
#   define ELPP_TRACE_LOG 0
#endif  // (!defined(ELPP_DISABLE_TRACE_LOGS) && (ELPP_LOGGING_ENABLED))
#if (!defined(ELPP_DISABLE_VERBOSE_LOGS) && (ELPP_LOGGING_ENABLED))
#   define ELPP_VERBOSE_LOG 1
#else
#   define ELPP_VERBOSE_LOG 0
#endif  // (!defined(ELPP_DISABLE_VERBOSE_LOGS) && (ELPP_LOGGING_ENABLED))
#if (!(ELPP_CXX0X || ELPP_CXX11))
#   error "Easylogging++ 9.0+ is only compatible with C++0x (or higher) compliant compiler"
#endif  // (!(ELPP_CXX0X || ELPP_CXX11))
// Headers
#if defined(ELPP_SYSLOG)
#   include <syslog.h>
#endif  // defined(ELPP_SYSLOG)
#include <ctime>
#include <cstring>
#include <cstdlib>
#include <cctype>
#include <cwchar>
#include <csignal>
#include <cerrno>
#include <cstdarg>
#if defined(ELPP_UNICODE)
#   include <locale>
#   if ELPP_OS_WINDOWS
#      include <codecvt>
#   endif // ELPP_OS_WINDOWS
#endif  // defined(ELPP_UNICODE)
#if ELPP_STACKTRACE
#   include <cxxabi.h>
#   include <execinfo.h>
#endif  // ELPP_STACKTRACE
#if ELPP_OS_ANDROID
#   include <sys/system_properties.h>
#endif  // ELPP_OS_ANDROID
#if ELPP_OS_UNIX
#   include <sys/stat.h>
#   include <sys/time.h>
#elif ELPP_OS_WINDOWS
#   include <direct.h>
#   include <windows.h>
#   if defined(WIN32_LEAN_AND_MEAN)
#      if defined(ELPP_WINSOCK2)
#         include <winsock2.h>
#      else
#         include <winsock.h>
#      endif // defined(ELPP_WINSOCK2)
#   endif // defined(WIN32_LEAN_AND_MEAN)
#endif  // ELPP_OS_UNIX
#include <string>
#include <vector>
#include <map>
#include <utility>
#include <functional>
#include <algorithm>
#include <fstream>
#include <iostream>
#include <sstream>
#include <memory>
#include <type_traits>
#if ELPP_THREADING_ENABLED
#   if ELPP_USE_STD_THREADING
#      include <mutex>
#      include <thread>
#   else
#      if ELPP_OS_UNIX
#         include <pthread.h>
#      endif  // ELPP_OS_UNIX
#   endif  // ELPP_USE_STD_THREADING
#endif  // ELPP_THREADING_ENABLED
#if ELPP_ASYNC_LOGGING
#   if defined(ELPP_NO_SLEEP_FOR)
#      include <unistd.h>
#   endif  // defined(ELPP_NO_SLEEP_FOR)
#   include <thread>
#   include <queue>
#   include <condition_variable>
#endif  // ELPP_ASYNC_LOGGING
#if defined(ELPP_STL_LOGGING)
// For logging STL based templates
#   include <list>
#   include <queue>
#   include <deque>
#   include <set>
#   include <bitset>
#   include <stack>
#   if defined(ELPP_LOG_STD_ARRAY)
#      include <array>
#   endif  // defined(ELPP_LOG_STD_ARRAY)
#   if defined(ELPP_LOG_UNORDERED_MAP)
#      include <unordered_map>
#   endif  // defined(ELPP_LOG_UNORDERED_MAP)
#   if defined(ELPP_LOG_UNORDERED_SET)
#      include <unordered_set>
#   endif  // defined(ELPP_UNORDERED_SET)
#endif  // defined(ELPP_STL_LOGGING)
#if defined(ELPP_QT_LOGGING)
// For logging Qt based classes & templates
#   include <QString>
#   include <QByteArray>
#   include <QVector>
#   include <QList>
#   include <QPair>
#   include <QMap>
#   include <QQueue>
#   include <QSet>
#   include <QLinkedList>
#   include <QHash>
#   include <QMultiHash>
#   include <QStack>
#endif  // defined(ELPP_QT_LOGGING)
#if defined(ELPP_BOOST_LOGGING)
// For logging boost based classes & templates
#   include <boost/container/vector.hpp>
#   include <boost/container/stable_vector.hpp>
#   include <boost/container/list.hpp>
#   include <boost/container/deque.hpp>
#   include <boost/container/map.hpp>
#   include <boost/container/flat_map.hpp>
#   include <boost/container/set.hpp>
#   include <boost/container/flat_set.hpp>
#endif  // defined(ELPP_BOOST_LOGGING)
#if defined(ELPP_WXWIDGETS_LOGGING)
// For logging wxWidgets based classes & templates
#   include <wx/vector.h>
#endif  // defined(ELPP_WXWIDGETS_LOGGING)
// Forward declarations
namespace el {
    class Logger;
    class LogMessage;
    class PerformanceTrackingData;
    class Loggers;
    class Helpers;
    template <typename T> class Callback;
    class LogDispatchCallback;
    class PerformanceTrackingCallback;
    class LogDispatchData;
    namespace base {
        class Storage;
        class RegisteredLoggers;
        class PerformanceTracker;
        class MessageBuilder;
        class Writer;
        class PErrorWriter;
        class LogDispatcher;
        class DefaultLogBuilder;
        class DefaultLogDispatchCallback;
#if ELPP_ASYNC_LOGGING
        class AsyncLogDispatchCallback;
        class AsyncDispatchWorker;
#endif // ELPP_ASYNC_LOGGING
        class DefaultPerformanceTrackingCallback;
    }  // namespace base
}  // namespace el
/// @brief Easylogging++ entry namespace
namespace el {
    /// @brief Namespace containing base/internal functionality used by Easylogging++
    namespace base {
        /// @brief Data types used by Easylogging++
        namespace type {
#undef ELPP_LITERAL
#undef ELPP_STRLEN
#undef ELPP_COUT
#if defined(ELPP_UNICODE)
#   define ELPP_LITERAL(txt) L##txt
#   define ELPP_STRLEN wcslen
#   if defined ELPP_CUSTOM_COUT
#      define ELPP_COUT ELPP_CUSTOM_COUT
#   else
#      define ELPP_COUT std::wcout
#   endif  // defined ELPP_CUSTOM_COUT
            typedef wchar_t char_t;
            typedef std::wstring string_t;
            typedef std::wstringstream stringstream_t;
            typedef std::wfstream fstream_t;
            typedef std::wostream ostream_t;
#else
#   define ELPP_LITERAL(txt) txt
#   define ELPP_STRLEN strlen
#   if defined ELPP_CUSTOM_COUT
#      define ELPP_COUT ELPP_CUSTOM_COUT
#   else
#      define ELPP_COUT std::cout
#   endif  // defined ELPP_CUSTOM_COUT
            typedef char char_t;
            typedef std::string string_t;
            typedef std::stringstream stringstream_t;
            typedef std::fstream fstream_t;
            typedef std::ostream ostream_t;
#endif  // defined(ELPP_UNICODE)
#if defined(ELPP_CUSTOM_COUT_LINE)
#   define ELPP_COUT_LINE(logLine) ELPP_CUSTOM_COUT_LINE(logLine)
#else
#   define ELPP_COUT_LINE(logLine) logLine << std::flush
#endif // defined(ELPP_CUSTOM_COUT_LINE)
            typedef unsigned short EnumType;
            typedef std::shared_ptr<base::Storage> StoragePointer;
            typedef int VerboseLevel;
            typedef std::shared_ptr<LogDispatchCallback> LogDispatchCallbackPtr;
            typedef std::shared_ptr<PerformanceTrackingCallback> PerformanceTrackingCallbackPtr;
        }  // namespace type
        /// @brief Internal helper class that prevent copy constructor for class
        ///
        /// @detail When using this class simply inherit it privately
        class NoCopy {
        protected:
            NoCopy(void) {}
        private:
            NoCopy(const NoCopy&);
            NoCopy& operator=(const NoCopy&);
        };
        /// @brief Internal helper class that makes all default constructors private.
        ///
        /// @detail This prevents initializing class making it static unless an explicit constructor is declared.
        /// When using this class simply inherit it privately
        class StaticClass {
        private:
            StaticClass(void);
            StaticClass(const StaticClass&);
            StaticClass& operator=(const StaticClass&);
        };
    }  // namespace base
    /// @brief Represents enumeration for severity level used to determine level of logging
    ///
    /// @detail With Easylogging++, developers may disable or enable any level regardless of
    /// what the severity is. Or they can choose to log using hierarchical logging flag
    enum class Level : base::type::EnumType {
        /// @brief Generic level that represents all the levels. Useful when setting global configuration for all levels
        Global = 1,
        /// @brief Information that can be useful to back-trace certain events - mostly useful than debug logs.
        Trace = 2,
        /// @brief Informational events most useful for developers to debug application
        Debug = 4,
        /// @brief Severe error information that will presumably abort application
        Fatal = 8,
        /// @brief Information representing errors in application but application will keep running
        Error = 16,
        /// @brief Useful when application has potentially harmful situtaions
        Warning = 32,
        /// @brief Information that can be highly useful and vary with verbose logging level.
        Verbose = 64,
        /// @brief Mainly useful to represent current progress of application
        Info = 128,
        /// @brief Represents unknown level
        Unknown = 1010
        };
        /// @brief Static class that contains helper functions for el::Level
        class LevelHelper : base::StaticClass {
        public:
            /// @brief Represents minimum valid level. Useful when iterating through enum.
            static const base::type::EnumType kMinValid = static_cast<base::type::EnumType>(Level::Trace);
            /// @brief Represents maximum valid level. This is used internally and you should not need it.
            static const base::type::EnumType kMaxValid = static_cast<base::type::EnumType>(Level::Info);
            /// @brief Casts level to int, useful for iterating through enum.
            static base::type::EnumType castToInt(Level level) {
                return static_cast<base::type::EnumType>(level);
            }
            /// @brief Casts int(ushort) to level, useful for iterating through enum.
            static Level castFromInt(base::type::EnumType l) {
                return static_cast<Level>(l);
            }
            /// @brief Converts level to associated const char*
            /// @return Upper case string based level.
            static const char* convertToString(Level level) {
                // Do not use switch over strongly typed enums because Intel C++ compilers dont support them yet.
                if (level == Level::Global) return "GLOBAL";
                if (level == Level::Debug) return "DEBUG";
                if (level == Level::Info) return "INFO";
                if (level == Level::Warning) return "WARNING";
                if (level == Level::Error) return "ERROR";
                if (level == Level::Fatal) return "FATAL";
                if (level == Level::Verbose) return "VERBOSE";
                if (level == Level::Trace) return "TRACE";
                return "UNKNOWN";
            }
            /// @brief Converts from levelStr to Level
            /// @param levelStr Upper case string based level.
            ///        Lower case is also valid but providing upper case is recommended.
            static Level convertFromString(const char* levelStr) {
                if ((strcmp(levelStr, "GLOBAL") == 0) || (strcmp(levelStr, "global") == 0))
                    return Level::Global;
                if ((strcmp(levelStr, "DEBUG") == 0) || (strcmp(levelStr, "debug") == 0))
                    return Level::Debug;
                if ((strcmp(levelStr, "INFO") == 0) || (strcmp(levelStr, "info") == 0))
                    return Level::Info;
                if ((strcmp(levelStr, "WARNING") == 0) || (strcmp(levelStr, "warning") == 0))
                    return Level::Warning;
                if ((strcmp(levelStr, "ERROR") == 0) || (strcmp(levelStr, "error") == 0))
                    return Level::Error;
                if ((strcmp(levelStr, "FATAL") == 0) || (strcmp(levelStr, "fatal") == 0))
                    return Level::Fatal;
                if ((strcmp(levelStr, "VERBOSE") == 0) || (strcmp(levelStr, "verbose") == 0))
                    return Level::Verbose;
                if ((strcmp(levelStr, "TRACE") == 0) || (strcmp(levelStr, "trace") == 0))
                    return Level::Trace;
                return Level::Unknown;
            }
            /// @brief Applies specified function to each level starting from startIndex
            /// @param startIndex initial value to start the iteration from. This is passed as pointer and
            ///        is left-shifted so this can be used inside function (fn) to represent current level.
            /// @param fn function to apply with each level. This bool represent whether or not to stop iterating through levels.
            static inline void forEachLevel(base::type::EnumType* startIndex, const std::function<bool(void)>& fn) {
                base::type::EnumType lIndexMax = LevelHelper::kMaxValid;
                do {
                    if (fn()) {
                        break;
                    }
                    *startIndex = static_cast<base::type::EnumType>(*startIndex << 1);
                } while (*startIndex <= lIndexMax);
            }
        };
        /// @brief Represents enumeration of ConfigurationType used to configure or access certain aspect
        /// of logging
        enum class ConfigurationType : base::type::EnumType {
            /// @brief Determines whether or not corresponding level and logger of logging is enabled
            /// You may disable all logs by using el::Level::Global
            Enabled = 1,
            /// @brief Whether or not to write corresponding log to log file
            ToFile = 2,
            /// @brief Whether or not to write corresponding level and logger log to standard output.
            /// By standard output meaning termnal, command prompt etc
            ToStandardOutput = 4,
            /// @brief Determines format of logging corresponding level and logger.
            Format = 8,
            /// @brief Determines log file (full path) to write logs to for correponding level and logger
            Filename = 16,
            /// @brief Specifies milliseconds width. Width can be within range (1-6)
            MillisecondsWidth = 32,
            /// @brief Determines whether or not performance tracking is enabled.
            ///
            /// @detail This does not depend on logger or level. Performance tracking always uses 'performance' logger
            PerformanceTracking = 64,
            /// @brief Specifies log file max size.
            ///
            /// @detail If file size of corresponding log file (for corresponding level) is >= specified size, log file will
            /// be truncated and re-initiated.
            MaxLogFileSize = 128,
            /// @brief Specifies number of log entries to hold until we flush pending log data
            LogFlushThreshold = 256,
            /// @brief Represents unknown configuration
            Unknown = 1010
            };
            /// @brief Static class that contains helper functions for el::ConfigurationType
            class ConfigurationTypeHelper : base::StaticClass {
            public:
                /// @brief Represents minimum valid configuration type. Useful when iterating through enum.
                static const base::type::EnumType kMinValid = static_cast<base::type::EnumType>(ConfigurationType::Enabled);
                /// @brief Represents maximum valid configuration type. This is used internally and you should not need it.
                static const base::type::EnumType kMaxValid = static_cast<base::type::EnumType>(ConfigurationType::MaxLogFileSize);
                /// @brief Casts configuration type to int, useful for iterating through enum.
                static base::type::EnumType castToInt(ConfigurationType configurationType) {
                    return static_cast<base::type::EnumType>(configurationType);
                }
                /// @brief Casts int(ushort) to configurationt type, useful for iterating through enum.
                static ConfigurationType castFromInt(base::type::EnumType c) {
                    return static_cast<ConfigurationType>(c);
                }
                /// @brief Converts configuration type to associated const char*
                /// @returns Upper case string based configuration type.
                static const char* convertToString(ConfigurationType configurationType) {
                    // Do not use switch over strongly typed enums because Intel C++ compilers dont support them yet.
                    if (configurationType == ConfigurationType::Enabled) return "ENABLED";
                    if (configurationType == ConfigurationType::Filename) return "FILENAME";
                    if (configurationType == ConfigurationType::Format) return "FORMAT";
                    if (configurationType == ConfigurationType::ToFile) return "TO_FILE";
                    if (configurationType == ConfigurationType::ToStandardOutput) return "TO_STANDARD_OUTPUT";
                    if (configurationType == ConfigurationType::MillisecondsWidth) return "MILLISECONDS_WIDTH";
                    if (configurationType == ConfigurationType::PerformanceTracking) return "PERFORMANCE_TRACKING";
                    if (configurationType == ConfigurationType::MaxLogFileSize) return "MAX_LOG_FILE_SIZE";
                    if (configurationType == ConfigurationType::LogFlushThreshold) return "LOG_FLUSH_THRESHOLD";
                    return "UNKNOWN";
                }
                /// @brief Converts from configStr to ConfigurationType
                /// @param configStr Upper case string based configuration type.
                ///        Lower case is also valid but providing upper case is recommended.
                static ConfigurationType convertFromString(const char* configStr) {
                    if ((strcmp(configStr, "ENABLED") == 0) || (strcmp(configStr, "enabled") == 0))
                        return ConfigurationType::Enabled;
                    if ((strcmp(configStr, "TO_FILE") == 0) || (strcmp(configStr, "to_file") == 0))
                        return ConfigurationType::ToFile;
                    if ((strcmp(configStr, "TO_STANDARD_OUTPUT") == 0) || (strcmp(configStr, "to_standard_output") == 0))
                        return ConfigurationType::ToStandardOutput;
                    if ((strcmp(configStr, "FORMAT") == 0) || (strcmp(configStr, "format") == 0))
                        return ConfigurationType::Format;
                    if ((strcmp(configStr, "FILENAME") == 0) || (strcmp(configStr, "filename") == 0))
                        return ConfigurationType::Filename;
                    if ((strcmp(configStr, "MILLISECONDS_WIDTH") == 0) || (strcmp(configStr, "milliseconds_width") == 0))
                        return ConfigurationType::MillisecondsWidth;
                    if ((strcmp(configStr, "PERFORMANCE_TRACKING") == 0) || (strcmp(configStr, "performance_tracking") == 0))
                        return ConfigurationType::PerformanceTracking;
                    if ((strcmp(configStr, "MAX_LOG_FILE_SIZE") == 0) || (strcmp(configStr, "max_log_file_size") == 0))
                        return ConfigurationType::MaxLogFileSize;
                    if ((strcmp(configStr, "LOG_FLUSH_THRESHOLD") == 0) || (strcmp(configStr, "log_flush_threshold") == 0))
                        return ConfigurationType::LogFlushThreshold;
                    return ConfigurationType::Unknown;
                }
                /// @brief Applies specified function to each configuration type starting from startIndex
                /// @param startIndex initial value to start the iteration from. This is passed by pointer and is left-shifted
                ///        so this can be used inside function (fn) to represent current configuration type.
                /// @param fn function to apply with each configuration type.
                ///        This bool represent whether or not to stop iterating through configurations.
                static inline void forEachConfigType(base::type::EnumType* startIndex, const std::function<bool(void)>& fn) {
                    base::type::EnumType cIndexMax = ConfigurationTypeHelper::kMaxValid;
                    do {
                        if (fn()) {
                            break;
                        }
                        *startIndex = static_cast<base::type::EnumType>(*startIndex << 1);
                    } while (*startIndex <= cIndexMax);
                }
            };
            /// @brief Flags used while writing logs. This flags are set by user
            enum class LoggingFlag : base::type::EnumType {
                /// @brief Makes sure we have new line for each container log entry
                NewLineForContainer = 1,
                /// @brief Makes sure if -vmodule is used and does not specifies a module, then verbose
                /// logging is allowed via that module.
                AllowVerboseIfModuleNotSpecified = 2,
                /// @brief When handling crashes by default, detailed crash reason will be logged as well
                LogDetailedCrashReason = 4,
                /// @brief Allows to disable application abortion when logged using FATAL level
                DisableApplicationAbortOnFatalLog = 8,
                /// @brief Flushes log with every log-entry (performance sensative) - Disabled by default
                ImmediateFlush = 16,
                /// @brief Enables strict file rolling
                StrictLogFileSizeCheck = 32,
                /// @brief Make terminal output colorful for supported terminals
                ColoredTerminalOutput = 64,
                /// @brief Supports use of multiple logging in same macro, e.g, CLOG(INFO, "default", "network")
                MultiLoggerSupport = 128,
                /// @brief Disables comparing performance tracker's checkpoints
                DisablePerformanceTrackingCheckpointComparison = 256,
                /// @brief Disable VModules
                DisableVModules = 512,
                /// @brief Disable VModules extensions
                DisableVModulesExtensions = 1024,
                /// @brief Enables hierarchical logging
                HierarchicalLogging = 2048,
                /// @brief Creates logger automatically when not available
                CreateLoggerAutomatically = 4096,
                /// @brief Adds spaces b/w logs that separated by left-shift operator
                AutoSpacing = 8192,
                /// @brief Preserves time format and does not convert it to sec, hour etc (performance tracking only)
                FixedTimeFormat = 16384
                };
                namespace base {
                    /// @brief Namespace containing constants used internally.
                    namespace consts {
                        // Level log values - These are values that are replaced in place of %level format specifier
                        static const base::type::char_t* kInfoLevelLogValue     =   ELPP_LITERAL("INFO ");
                        static const base::type::char_t* kDebugLevelLogValue    =   ELPP_LITERAL("DEBUG");
                        static const base::type::char_t* kWarningLevelLogValue  =   ELPP_LITERAL("WARN ");
                        static const base::type::char_t* kErrorLevelLogValue    =   ELPP_LITERAL("ERROR");
                        static const base::type::char_t* kFatalLevelLogValue    =   ELPP_LITERAL("FATAL");
                        static const base::type::char_t* kVerboseLevelLogValue  =   ELPP_LITERAL("VER");
                        static const base::type::char_t* kTraceLevelLogValue    =   ELPP_LITERAL("TRACE");
                        static const base::type::char_t* kInfoLevelShortLogValue     =   ELPP_LITERAL("I");
                        static const base::type::char_t* kDebugLevelShortLogValue    =   ELPP_LITERAL("D");
                        static const base::type::char_t* kWarningLevelShortLogValue  =   ELPP_LITERAL("W");
                        static const base::type::char_t* kErrorLevelShortLogValue    =   ELPP_LITERAL("E");
                        static const base::type::char_t* kFatalLevelShortLogValue    =   ELPP_LITERAL("F");
                        static const base::type::char_t* kVerboseLevelShortLogValue  =   ELPP_LITERAL("V");
                        static const base::type::char_t* kTraceLevelShortLogValue    =   ELPP_LITERAL("T");
                        // Format specifiers - These are used to define log format
                        static const base::type::char_t* kAppNameFormatSpecifier          =      ELPP_LITERAL("%app");
                        static const base::type::char_t* kLoggerIdFormatSpecifier         =      ELPP_LITERAL("%logger");
                        static const base::type::char_t* kThreadIdFormatSpecifier         =      ELPP_LITERAL("%thread");
                        static const base::type::char_t* kSeverityLevelFormatSpecifier    =      ELPP_LITERAL("%level");
                        static const base::type::char_t* kSeverityLevelShortFormatSpecifier    =      ELPP_LITERAL("%levshort");
                        static const base::type::char_t* kDateTimeFormatSpecifier         =      ELPP_LITERAL("%datetime");
                        static const base::type::char_t* kLogFileFormatSpecifier          =      ELPP_LITERAL("%file");
                        static const base::type::char_t* kLogFileBaseFormatSpecifier      =      ELPP_LITERAL("%fbase");
                        static const base::type::char_t* kLogLineFormatSpecifier          =      ELPP_LITERAL("%line");
                        static const base::type::char_t* kLogLocationFormatSpecifier      =      ELPP_LITERAL("%loc");
                        static const base::type::char_t* kLogFunctionFormatSpecifier      =      ELPP_LITERAL("%func");
                        static const base::type::char_t* kCurrentUserFormatSpecifier      =      ELPP_LITERAL("%user");
                        static const base::type::char_t* kCurrentHostFormatSpecifier      =      ELPP_LITERAL("%host");
                        static const base::type::char_t* kMessageFormatSpecifier          =      ELPP_LITERAL("%msg");
                        static const base::type::char_t* kVerboseLevelFormatSpecifier     =      ELPP_LITERAL("%vlevel");
                        static const char* kDateTimeFormatSpecifierForFilename            =      "%datetime";
                        // Date/time
                        static const char* kDays[7]                         =      { "Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday" };
                        static const char* kDaysAbbrev[7]                   =      { "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat" };
                        static const char* kMonths[12]                      =      { "January", "February", "March", "Apri", "May", "June", "July", "August",
                            "September", "October", "November", "December" };
                        static const char* kMonthsAbbrev[12]                =      { "Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec" };
                        static const char* kDefaultDateTimeFormat           =      "%Y-%M-%d %H:%m:%s,%g";
                        static const char* kDefaultDateTimeFormatInFilename =      "%Y-%M-%d_%H-%m";
                        static const int kYearBase                          =      1900;
                        static const char* kAm                              =      "AM";
                        static const char* kPm                              =      "PM";
                        // Miscellaneous constants
                        static const char* kDefaultLoggerId                        =      "default";
                        static const char* kPerformanceLoggerId                    =      "performance";
#if defined(ELPP_SYSLOG)
                        static const char* kSysLogLoggerId                         =      "syslog";
#endif  // defined(ELPP_SYSLOG)
                        static const char* kNullPointer                            =      "nullptr";
                        static const char  kFormatSpecifierChar                    =      '%';
#if ELPP_VARIADIC_TEMPLATES_SUPPORTED
                        static const char  kFormatSpecifierCharValue               =      'v';
#endif  // ELPP_VARIADIC_TEMPLATES_SUPPORTED
                        static const unsigned int kMaxLogPerContainer              =      100;
                        static const unsigned int kMaxLogPerCounter                =      100000;
                        static const unsigned int  kDefaultMillisecondsWidth       =      3;
                        static const base::type::VerboseLevel kMaxVerboseLevel     =      9;
                        static const char* kUnknownUser                            =      "user";
                        static const char* kUnknownHost                            =      "unknown-host";
#if defined(ELPP_DEFAULT_LOG_FILE)
                        static const char* kDefaultLogFile                         =      ELPP_DEFAULT_LOG_FILE;
#else
#   if ELPP_OS_UNIX
#      if ELPP_OS_ANDROID
                        static const char* kDefaultLogFile                         =      "logs/myeasylog.log";
#      else
                        static const char* kDefaultLogFile                         =      "logs/myeasylog.log";
#      endif  // ELPP_OS_ANDROID
#   elif ELPP_OS_WINDOWS
                        static const char* kDefaultLogFile                         =      "logs\\myeasylog.log";
#   endif  // ELPP_OS_UNIX
#endif  // defined(ELPP_DEFAULT_LOG_FILE)
#if !defined(ELPP_DISABLE_LOG_FILE_FROM_ARG)
                        static const char* kDefaultLogFileParam                    =      "--default-log-file";
#endif  // !defined(ELPP_DISABLE_LOG_FILE_FROM_ARG)
#if defined(ELPP_LOGGING_FLAGS_FROM_ARG)
                        static const char* kLoggingFlagsParam                      =      "--logging-flags";
#endif  // defined(ELPP_LOGGING_FLAGS_FROM_ARG)
#if ELPP_OS_WINDOWS
                        static const char* kFilePathSeperator                      =      "\\";
#else
                        static const char* kFilePathSeperator                      =      "/";
#endif  // ELPP_OS_WINDOWS
                        static const char* kValidLoggerIdSymbols                   =      "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789-._";
                        static const char* kConfigurationComment                   =      "##";
                        static const char* kConfigurationLevel                     =      "*";
                        static const char* kConfigurationLoggerId                  =      "--";
                        static const std::size_t kSourceFilenameMaxLength          =      100;
                        static const std::size_t kSourceLineMaxLength              =      10;
                        static const Level kPerformanceTrackerDefaultLevel         =      Level::Info;
                        const struct {
                            double value;
                            const base::type::char_t* unit;
                        } kTimeFormats[] = {
                            { 1000.0f, ELPP_LITERAL("mis") },
                            { 1000.0f, ELPP_LITERAL("ms") },
                            { 60.0f, ELPP_LITERAL("seconds") },
                            { 60.0f, ELPP_LITERAL("minutes") },
                            { 24.0f, ELPP_LITERAL("hours") },
                            { 7.0f, ELPP_LITERAL("days") }
                        };
                        static const int kTimeFormatsCount                           =      sizeof(kTimeFormats) / sizeof(kTimeFormats[0]);
                        const struct {
                            int numb;
                            const char* name;
                            const char* brief;
                            const char* detail;
                        } kCrashSignals[] = {
                            // NOTE: Do not re-order, if you do please check CrashHandler(bool) constructor and CrashHandler::setHandler(..)
                            { SIGABRT, "SIGABRT", "Abnormal termination",
                                "Program was abnormally terminated." },
                            { SIGFPE, "SIGFPE", "Erroneous arithmetic operation",
                                "Arithemetic operation issue such as division by zero or operation resulting in overflow." },
                            { SIGILL, "SIGILL", "Illegal instruction",
                                "Generally due to a corruption in the code or to an attempt to execute data."},
                            { SIGSEGV, "SIGSEGV", "Invalid access to memory",
                                "Program is trying to read an invalid (unallocated, deleted or corrupted) or inaccessible memory." },
                            { SIGINT, "SIGINT", "Interactive attention signal",
                                "Interruption generated (generally) by user or operating system." },
                        };
                        static const int kCrashSignalsCount                          =      sizeof(kCrashSignals) / sizeof(kCrashSignals[0]);
                    }  // namespace consts
                }  // namespace base
                typedef std::function<void(const char*, std::size_t)> PreRollOutCallback;
                namespace base {
                    static inline void defaultPreRollOutCallback(const char*, std::size_t) {}
                    /// @brief Enum to represent timestamp unit
                    enum class TimestampUnit : base::type::EnumType {
                        Microsecond = 0, Millisecond = 1, Second = 2, Minute = 3, Hour = 4, Day = 5
                        };
                        /// @brief Format flags used to determine specifiers that are active for performance improvements.
                        enum class FormatFlags : base::type::EnumType {
                            DateTime = 1<<1, LoggerId = 1<<2, File = 1<<3, Line = 1<<4, Location = 1<<5, Function = 1<<6,
                            User = 1<<7, Host = 1<<8, LogMessage = 1<<9, VerboseLevel = 1<<10, AppName = 1<<11, ThreadId = 1<<12,
                            Level = 1<<13, FileBase = 1<<14, LevelShort = 1<<15
                            };
                            /// @brief A milliseconds width class containing actual width and offset for date/time
                            class MillisecondsWidth {
                            public:
                                MillisecondsWidth(void) { init(base::consts::kDefaultMillisecondsWidth); }
                                explicit MillisecondsWidth(int width) { init(width); }
                                bool operator==(const MillisecondsWidth& msWidth) { return m_width == msWidth.m_width && m_offset == msWidth.m_offset; }
                                int m_width; unsigned int m_offset;
                            private:
                                void init(int width) {
                                    if (width < 1 || width > 6) {
                                        width = base::consts::kDefaultMillisecondsWidth;
                                    }
                                    m_width = width;
                                    switch (m_width) {
                                        case 3: m_offset = 1000; break;
                                        case 4: m_offset = 100; break;
                                        case 5: m_offset = 10; break;
                                        case 6: m_offset = 1; break;
                                        default: m_offset = 1000; break;
                                    }
                                }
                            };
                            /// @brief Namespace containing utility functions/static classes used internally
                            namespace utils {
                                /// @brief Deletes memory safely and points to null
                                template <typename T>
                                static inline
                                typename std::enable_if<std::is_pointer<T*>::value, void>::type
                                safeDelete(T*& pointer) {
                                    if (pointer == nullptr)
                                        return;
                                    delete pointer;
                                    pointer = nullptr;
                                }
                                /// @brief Gets value of const char* but if it is nullptr, a string nullptr is returned
                                static inline const char* charPtrVal(const char* pointer) {
                                    return pointer == nullptr ? base::consts::kNullPointer : pointer;
                                }
                                /// @brief Aborts application due with user-defined status
                                static inline void abort(int status, const std::string& reason = std::string()) {
                                    // Both status and reason params are there for debugging with tools like gdb etc
                                    ELPP_UNUSED(status);
                                    ELPP_UNUSED(reason);
#if defined(ELPP_COMPILER_MSVC) && defined(_M_IX86) && defined(_DEBUG)
                                    // Ignore msvc critical error dialog - break instead (on debug mode)
                                    _asm int 3
#else
                                    ::abort();
#endif  // defined(ELPP_COMPILER_MSVC) && defined(_M_IX86) && defined(_DEBUG)
                                }
                                /// @brief Bitwise operations for C++11 strong enum class. This casts e into Flag_T and returns value after bitwise operation
                                /// Use these function as <pre>flag = bitwise::Or<MyEnum>(MyEnum::val1, flag);</pre>
                                namespace bitwise {
                                    template <typename Enum>
                                    static inline base::type::EnumType And(Enum e, base::type::EnumType flag) {
                                        return static_cast<base::type::EnumType>(flag) & static_cast<base::type::EnumType>(e);
                                    }
                                    template <typename Enum>
                                    static inline base::type::EnumType Not(Enum e, base::type::EnumType flag) {
                                        return static_cast<base::type::EnumType>(flag) & ~(static_cast<base::type::EnumType>(e));
                                    }
                                    template <typename Enum>
                                    static inline base::type::EnumType Or(Enum e, base::type::EnumType flag) {
                                        return static_cast<base::type::EnumType>(flag) | static_cast<base::type::EnumType>(e);
                                    }
                                }  // namespace bitwise
                                template <typename Enum>
                                static inline void addFlag(Enum e, base::type::EnumType* flag) {
                                    *flag = base::utils::bitwise::Or<Enum>(e, *flag);
                                }
                                template <typename Enum>
                                static inline void removeFlag(Enum e, base::type::EnumType* flag) {
                                    *flag = base::utils::bitwise::Not<Enum>(e, *flag);
                                }
                                template <typename Enum>
                                static inline bool hasFlag(Enum e, base::type::EnumType flag) {
                                    return base::utils::bitwise::And<Enum>(e, flag) > 0x0;
                                }
                            }  // namespace utils
                            namespace threading {
#if ELPP_THREADING_ENABLED
#   if !ELPP_USE_STD_THREADING
                                namespace internal {
                                    /// @brief A mutex wrapper for compiler that dont yet support std::mutex
                                    class Mutex : base::NoCopy {
                                    public:
                                        Mutex(void) {
#   if ELPP_OS_UNIX
                                            pthread_mutex_init(&m_underlyingMutex, nullptr);
#   elif ELPP_OS_WINDOWS
                                            InitializeCriticalSection(&m_underlyingMutex);
#   endif  // ELPP_OS_UNIX
                                        }
                                        
                                        virtual ~Mutex(void) {
#   if ELPP_OS_UNIX
                                            pthread_mutex_destroy(&m_underlyingMutex);
#   elif ELPP_OS_WINDOWS
                                            DeleteCriticalSection(&m_underlyingMutex);
#   endif  // ELPP_OS_UNIX
                                        }
                                        
                                        inline void lock(void) {
#   if ELPP_OS_UNIX
                                            pthread_mutex_lock(&m_underlyingMutex);
#   elif ELPP_OS_WINDOWS
                                            EnterCriticalSection(&m_underlyingMutex);
#   endif  // ELPP_OS_UNIX
                                        }
                                        
                                        inline bool try_lock(void) {
#   if ELPP_OS_UNIX
                                            return (pthread_mutex_trylock(&m_underlyingMutex) == 0);
#   elif ELPP_OS_WINDOWS
                                            return TryEnterCriticalSection(&m_underlyingMutex);
#   endif  // ELPP_OS_UNIX
                                        }
                                        
                                        inline void unlock(void) {
#   if ELPP_OS_UNIX
                                            pthread_mutex_unlock(&m_underlyingMutex);
#   elif ELPP_OS_WINDOWS
                                            LeaveCriticalSection(&m_underlyingMutex);
#   endif  // ELPP_OS_UNIX
                                        }
                                        
                                    private:
#   if ELPP_OS_UNIX
                                        pthread_mutex_t m_underlyingMutex;
#   elif ELPP_OS_WINDOWS
                                        CRITICAL_SECTION m_underlyingMutex;
#   endif  // ELPP_OS_UNIX
                                    };
                                    /// @brief Scoped lock for compiler that dont yet support std::lock_guard
                                    template <typename M>
                                    class ScopedLock : base::NoCopy {
                                    public:
                                        explicit ScopedLock(M& mutex) {
                                            m_mutex = &mutex;
                                            m_mutex->lock();
                                        }
                                        
                                        virtual ~ScopedLock(void) {
                                            m_mutex->unlock();
                                        }
                                    private:
                                        M* m_mutex;
                                        ScopedLock(void);
                                    };
                                } // namespace internal
                                /// @brief Gets ID of currently running threading in windows systems. On unix, nothing is returned.
                                static inline std::string getCurrentThreadId(void) {
                                    std::stringstream ss;
#      if (ELPP_OS_WINDOWS)
                                    ss << GetCurrentThreadId();
#      endif  // (ELPP_OS_WINDOWS)
                                    return ss.str();
                                }
                                static inline void msleep(int) {
                                    // No implementation for non std::thread version
                                }
                                typedef base::threading::internal::Mutex Mutex;
                                typedef base::threading::internal::ScopedLock<base::threading::Mutex> ScopedLock;
#   else
                                /// @brief Gets ID of currently running threading using std::this_thread::get_id()
                                static inline std::string getCurrentThreadId(void) {
                                    std::stringstream ss;
                                    ss << std::this_thread::get_id();
                                    return ss.str();
                                }
                                static inline void msleep(int ms) {
                                    // Only when async logging enabled - this is because async is strict on compiler
#      if ELPP_ASYNC_LOGGING
#         if defined(ELPP_NO_SLEEP_FOR)
                                    usleep(ms * 1000);
#         else
                                    std::this_thread::sleep_for(std::chrono::milliseconds(ms));
#         endif  // defined(ELPP_NO_SLEEP_FOR)
#      else
                                    ELPP_UNUSED(ms);
#      endif  // ELPP_ASYNC_LOGGING
                                }
                                typedef std::mutex Mutex;
                                typedef std::lock_guard<std::mutex> ScopedLock;
#   endif  // !ELPP_USE_STD_THREADING
#else
                                namespace internal {
                                    /// @brief Mutex wrapper used when multi-threading is disabled.
                                    class NoMutex : base::NoCopy {
                                    public:
                                        NoMutex(void) {}
                                        inline void lock(void) {}
                                        inline bool try_lock(void) { return true; }
                                        inline void unlock(void) {}
                                    };
                                    /// @brief Lock guard wrapper used when multi-threading is disabled.
                                    template <typename Mutex>
                                    class NoScopedLock : base::NoCopy {
                                    public:
                                        explicit NoScopedLock(Mutex&) {
                                        }
                                        virtual ~NoScopedLock(void) {
                                        }
                                    private:
                                        NoScopedLock(void);
                                    };
                                }  // namespace internal
                                static inline std::string getCurrentThreadId(void) {
                                    return std::string();
                                }
                                static inline void msleep(int) {
                                    // No custom implementation
                                }
                                typedef base::threading::internal::NoMutex Mutex;
                                typedef base::threading::internal::NoScopedLock<base::threading::Mutex> ScopedLock;
#endif  // ELPP_THREADING_ENABLED
                                /// @brief Base of thread safe class, this class is inheritable-only
                                class ThreadSafe {
                                public:
                                    virtual inline void acquireLock(void) ELPP_FINAL { m_mutex.lock(); }
                                    virtual inline void releaseLock(void) ELPP_FINAL { m_mutex.unlock(); }
                                    virtual inline base::threading::Mutex& lock(void) ELPP_FINAL { return m_mutex; }
                                protected:
                                    ThreadSafe(void) {}
                                    virtual ~ThreadSafe(void) {}
                                private:
                                    base::threading::Mutex m_mutex;
                                };
                            }  // namespace threading
                            namespace utils {
                                class File : base::StaticClass {
                                public:
                                    /// @brief Creates new out file stream for specified filename.
                                    /// @return Pointer to newly created fstream or nullptr
                                    static base::type::fstream_t* newFileStream(const std::string& filename) {
                                        base::type::fstream_t *fs = new base::type::fstream_t(filename.c_str(),
                                                                                              base::type::fstream_t::out
#if !defined(ELPP_FRESH_LOG_FILE)
                                                                                              | base::type::fstream_t::app
#endif
                                                                                              );
#if defined(ELPP_UNICODE)
                                        std::locale elppUnicodeLocale("");
#   if ELPP_OS_WINDOWS
                                        std::locale elppUnicodeLocaleWindows(elppUnicodeLocale, new std::codecvt_utf8_utf16<wchar_t>);
                                        elppUnicodeLocale = elppUnicodeLocaleWindows;
#   endif // ELPP_OS_WINDOWS
                                        fs->imbue(elppUnicodeLocale);
#endif  // defined(ELPP_UNICODE)
                                        if (fs->is_open()) {
                                            fs->flush();
                                        } else {
                                            base::utils::safeDelete(fs);
                                            ELPP_INTERNAL_ERROR("Bad file [" << filename << "]", true);
                                        }
                                        return fs;
                                    }
                                    
                                    /// @brief Gets size of file provided in stream
                                    static std::size_t getSizeOfFile(base::type::fstream_t* fs) {
                                        if (fs == nullptr) {
                                            return 0;
                                        }
                                        std::streampos currPos = fs->tellg();
                                        fs->seekg(0, fs->end);
                                        std::size_t size = static_cast<std::size_t>(fs->tellg());
                                        fs->seekg(currPos);
                                        return size;
                                    }
                                    
                                    /// @brief Determines whether or not provided path exist in current file system
                                    static inline bool pathExists(const char* path, bool considerFile = false) {
                                        if (path == nullptr) {
                                            return false;
                                        }
#if ELPP_OS_UNIX
                                        ELPP_UNUSED(considerFile);
                                        struct stat st;
                                        return (stat(path, &st) == 0);
#elif ELPP_OS_WINDOWS
                                        DWORD fileType = GetFileAttributesA(path);
                                        if (fileType == INVALID_FILE_ATTRIBUTES) {
                                            return false;
                                        }
                                        return considerFile ? true : ((fileType & FILE_ATTRIBUTE_DIRECTORY) == 0 ? false : true);
#endif  // ELPP_OS_UNIX
                                    }
                                    
                                    /// @brief Creates specified path on file system
                                    /// @param path Path to create.
                                    static bool createPath(const std::string& path) {
                                        if (path.empty()) {
                                            return false;
                                        }
                                        if (base::utils::File::pathExists(path.c_str())) {
                                            return true;
                                        }
                                        int status = -1;
                                        
                                        char* currPath = const_cast<char*>(path.c_str());
                                        std::string builtPath = std::string();
#if ELPP_OS_UNIX
                                        if (path[0] == '/') {
                                            builtPath = "/";
                                        }
                                        currPath = STRTOK(currPath, base::consts::kFilePathSeperator, 0);
#elif ELPP_OS_WINDOWS
                                        // Use secure functions API
                                        char* nextTok_ = nullptr;
                                        currPath = STRTOK(currPath, base::consts::kFilePathSeperator, &nextTok_);
                                        ELPP_UNUSED(nextTok_);
#endif  // ELPP_OS_UNIX
                                        while (currPath != nullptr) {
                                            builtPath.append(currPath);
                                            builtPath.append(base::consts::kFilePathSeperator);
#if ELPP_OS_UNIX
                                            status = mkdir(builtPath.c_str(), ELPP_LOG_PERMS);
                                            currPath = STRTOK(nullptr, base::consts::kFilePathSeperator, 0);
#elif ELPP_OS_WINDOWS
                                            status = _mkdir(builtPath.c_str());
                                            currPath = STRTOK(nullptr, base::consts::kFilePathSeperator, &nextTok_);
#endif  // ELPP_OS_UNIX
                                        }
                                        if (status == -1) {
                                            ELPP_INTERNAL_ERROR("Error while creating path [" << path << "]", true);
                                            return false;
                                        }
                                        return true;
                                    }
                                    /// @brief Extracts path of filename with leading slash
                                    static std::string extractPathFromFilename(const std::string& fullPath,
                                                                               const char* seperator = base::consts::kFilePathSeperator) {
                                        if ((fullPath == "") || (fullPath.find(seperator) == std::string::npos)) {
                                            return fullPath;
                                        }
                                        std::size_t lastSlashAt = fullPath.find_last_of(seperator);
                                        if (lastSlashAt == 0) {
                                            return std::string(seperator);
                                        }
                                        return fullPath.substr(0, lastSlashAt + 1);
                                    }
                                    /// @brief builds stripped filename and puts it in buff
                                    static void buildStrippedFilename(const char* filename, char buff[],
                                                                      std::size_t limit = base::consts::kSourceFilenameMaxLength) {
                                        std::size_t sizeOfFilename = strlen(filename);
                                        if (sizeOfFilename >= limit) {
                                            filename += (sizeOfFilename - limit);
                                            if (filename[0] != '.' && filename[1] != '.') {  // prepend if not already
                                                filename += 3;  // 3 = '..'
                                                STRCAT(buff, "..", limit);
                                            }
                                        }
                                        STRCAT(buff, filename, limit);
                                    }
                                    /// @brief builds base filename and puts it in buff
                                    static void buildBaseFilename(const std::string& fullPath, char buff[],
                                                                  std::size_t limit = base::consts::kSourceFilenameMaxLength,
                                                                  const char* seperator = base::consts::kFilePathSeperator) {
                                        const char *filename = fullPath.c_str();
                                        std::size_t lastSlashAt = fullPath.find_last_of(seperator);
                                        filename += lastSlashAt ? lastSlashAt+1 : 0;
                                        std::size_t sizeOfFilename = strlen(filename);
                                        if (sizeOfFilename >= limit) {
                                            filename += (sizeOfFilename - limit);
                                            if (filename[0] != '.' && filename[1] != '.') {  // prepend if not already
                                                filename += 3;  // 3 = '..'
                                                STRCAT(buff, "..", limit);
                                            }
                                        }
                                        STRCAT(buff, filename, limit);
                                    }
                                };
                                /// @brief String utilities helper class used internally. You should not use it.
                                class Str : base::StaticClass {
                                public:
                                    /// @brief Checks if character is digit. Dont use libc implementation of it to prevent locale issues.
                                    static inline bool isDigit(char c) {
                                        return c >= '0' && c <= '9';
                                    }
                                    
                                    /// @brief Matches wildcards, '*' and '?' only supported.
                                    static bool wildCardMatch(const char* str, const char* pattern) {
                                        while (*pattern) {
                                            switch (*pattern) {
                                                case '?':
                                                    if (!*str)
                                                        return false;
                                                    ++str;
                                                    ++pattern;
                                                    break;
                                                case '*':
                                                    if (wildCardMatch(str, pattern + 1))
                                                        return true;
                                                    if (*str && wildCardMatch(str + 1, pattern))
                                                        return true;
                                                    return false;
                                                default:
                                                    if (*str++ != *pattern++)
                                                        return false;
                                                    break;
                                            }
                                        }
                                        return !*str && !*pattern;
                                    }
                                    
                                    /// @brief Trims string from start
                                    /// @param [in,out] str String to trim
                                    static inline std::string& ltrim(std::string& str) {
                                        str.erase(str.begin(), std::find_if(str.begin(), str.end(), std::not1(std::ptr_fun<int, int>(&std::isspace))));
                                        return str;
                                    }
                                    
                                    /// @brief Trim string from end
                                    /// @param [in,out] str String to trim
                                    static inline std::string& rtrim(std::string& str) {
                                        str.erase(std::find_if(str.rbegin(), str.rend(), std::not1(std::ptr_fun<int, int>(&std::isspace))).base(), str.end());
                                        return str;
                                    }
                                    
                                    /// @brief Trims string from left and right
                                    /// @param [in,out] str String to trim
                                    static inline std::string& trim(std::string& str) {
                                        return ltrim(rtrim(str));
                                    }
                                    
                                    /// @brief Determines whether or not str starts with specified string
                                    /// @param str String to check
                                    /// @param start String to check against
                                    /// @return Returns true if starts with specified string, false otherwise
                                    static inline bool startsWith(const std::string& str, const std::string& start) {
                                        return (str.length() >= start.length()) && (str.compare(0, start.length(), start) == 0);
                                    }
                                    
                                    /// @brief Determines whether or not str ends with specified string
                                    /// @param str String to check
                                    /// @param end String to check against
                                    /// @return Returns true if ends with specified string, false otherwise
                                    static inline bool endsWith(const std::string& str, const std::string& end) {
                                        return (str.length() >= end.length()) && (str.compare(str.length() - end.length(), end.length(), end) == 0);
                                    }
                                    
                                    /// @brief Replaces all instances of replaceWhat with 'replaceWith'. Original variable is changed for performance.
                                    /// @param [in,out] str String to replace from
                                    /// @param replaceWhat Character to replace
                                    /// @param replaceWith Character to replace with
                                    /// @return Modified version of str
                                    static inline std::string& replaceAll(std::string& str, char replaceWhat, char replaceWith) {
                                        std::replace(str.begin(), str.end(), replaceWhat, replaceWith);
                                        return str;
                                    }
                                    
                                    /// @brief Replaces all instances of 'replaceWhat' with 'replaceWith'. (String version) Replaces in place
                                    /// @param str String to replace from
                                    /// @param replaceWhat Character to replace
                                    /// @param replaceWith Character to replace with
                                    /// @return Modified (original) str
                                    static inline std::string& replaceAll(std::string& str, const std::string& replaceWhat, // NOLINT
                                                                          const std::string& replaceWith) {
                                        if (replaceWhat == replaceWith)
                                            return str;
                                        std::size_t foundAt = std::string::npos;
                                        while ((foundAt = str.find(replaceWhat, foundAt + 1)) != std::string::npos) {
                                            str.replace(foundAt, replaceWhat.length(), replaceWith);
                                        }
                                        return str;
                                    }
                                    
                                    static void replaceFirstWithEscape(base::type::string_t& str, const base::type::string_t& replaceWhat, // NOLINT
                                                                       const base::type::string_t& replaceWith) {
                                        std::size_t foundAt = base::type::string_t::npos;
                                        while ((foundAt = str.find(replaceWhat, foundAt + 1)) != base::type::string_t::npos) {
                                            if (foundAt > 0 && str[foundAt - 1] == base::consts::kFormatSpecifierChar) {
                                                str.erase(foundAt > 0 ? foundAt - 1 : 0, 1);
                                                ++foundAt;
                                            } else {
                                                str.replace(foundAt, replaceWhat.length(), replaceWith);
                                                return;
                                            }
                                        }
                                    }
#if defined(ELPP_UNICODE)
                                    static void replaceFirstWithEscape(base::type::string_t& str, const base::type::string_t& replaceWhat, // NOLINT
                                                                       const std::string& replaceWith) {
                                        replaceFirstWithEscape(str, replaceWhat, base::type::string_t(replaceWith.begin(), replaceWith.end()));
                                    }
#endif  // defined(ELPP_UNICODE)
                                    /// @brief Converts string to uppercase
                                    /// @param str String to convert
                                    /// @return Uppercase string
                                    static inline std::string& toUpper(std::string& str) {
                                        std::transform(str.begin(), str.end(), str.begin(), ::toupper);
                                        return str;
                                    }
                                    
                                    /// @brief Compares cstring equality - uses strcmp
                                    static inline bool cStringEq(const char* s1, const char* s2) {
                                        if (s1 == nullptr && s2 == nullptr) return true;
                                        if (s1 == nullptr || s2 == nullptr) return false;
                                        return strcmp(s1, s2) == 0;
                                    }
                                    
                                    /// @brief Compares cstring equality (case-insensitive) - uses toupper(char)
                                    /// Dont use strcasecmp because of CRT (VC++)
                                    static bool cStringCaseEq(const char* s1, const char* s2) {
                                        if (s1 == nullptr && s2 == nullptr) return true;
                                        if (s1 == nullptr || s2 == nullptr) return false;
                                        if (strlen(s1) != strlen(s2)) return false;
                                        while (*s1 != '\0' && *s2 != '\0') {
                                            if (::toupper(*s1) != ::toupper(*s2)) return false;
                                            ++s1;
                                            ++s2;
                                        }
                                        return true;
                                    }
                                    
                                    /// @brief Returns true if c exist in str
                                    static inline bool contains(const char* str, char c) {
                                        for (; *str; ++str) {
                                            if (*str == c)
                                                return true;
                                        }
                                        return false;
                                    }
                                    
                                    static inline char* convertAndAddToBuff(std::size_t n, int len, char* buf, const char* bufLim, bool zeroPadded = true) {
                                        char localBuff[10] = "";
                                        char* p = localBuff + sizeof(localBuff) - 2;
                                        if (n > 0) {
                                            for (; n > 0 && p > localBuff && len > 0; n /= 10, --len)
                                                *--p = static_cast<char>(n % 10 + '0');
                                        } else {
                                            *--p = '0';
                                            --len;
                                        }
                                        if (zeroPadded)
                                            while (p > localBuff && len-- > 0) *--p = static_cast<char>('0');
                                        return addToBuff(p, buf, bufLim);
                                    }
                                    
                                    static inline char* addToBuff(const char* str, char* buf, const char* bufLim) {
                                        while ((buf < bufLim) && ((*buf = *str++) != '\0'))
                                            ++buf;
                                        return buf;
                                    }
                                    
                                    static inline char* clearBuff(char buff[], std::size_t lim) {
                                        STRCPY(buff, "", lim);
                                        ELPP_UNUSED(lim);  // For *nix we dont have anything using lim in above STRCPY macro
                                        return buff;
                                    }
                                    
                                    /// @brief Converst wchar* to char*
                                    ///        NOTE: Need to free return value after use!
                                    static char* wcharPtrToCharPtr(const wchar_t* line) {
                                        std::size_t len_ = wcslen(line) + 1;
                                        char* buff_ = static_cast<char*>(malloc(len_ + 1));
#      if ELPP_OS_UNIX || (ELPP_OS_WINDOWS && !ELPP_CRT_DBG_WARNINGS)
                                        std::wcstombs(buff_, line, len_);
#      elif ELPP_OS_WINDOWS
                                        std::size_t convCount_ = 0;
                                        mbstate_t mbState_;
                                        ::memset(static_cast<void*>(&mbState_), 0, sizeof(mbState_));
                                        wcsrtombs_s(&convCount_, buff_, len_, &line, len_, &mbState_);
#      endif  // ELPP_OS_UNIX || (ELPP_OS_WINDOWS && !ELPP_CRT_DBG_WARNINGS)
                                        return buff_;
                                    }
                                };
                                /// @brief Operating System helper static class used internally. You should not use it.
                                class OS : base::StaticClass {
                                public:
#if ELPP_OS_WINDOWS
                                    /// @brief Gets environment variables for Windows based OS.
                                    ///        We are not using <code>getenv(const char*)</code> because of CRT deprecation
                                    /// @param varname Variable name to get environment variable value for
                                    /// @return If variable exist the value of it otherwise nullptr
                                    static const char* getWindowsEnvironmentVariable(const char* varname) {
                                        const DWORD bufferLen = 50;
                                        static char buffer[bufferLen];
                                        if (GetEnvironmentVariableA(varname, buffer, bufferLen)) {
                                            return buffer;
                                        }
                                        return nullptr;
                                    }
#endif  // ELPP_OS_WINDOWS
#if ELPP_OS_ANDROID
                                    /// @brief Reads android property value
                                    static inline std::string getProperty(const char* prop) {
                                        char propVal[PROP_VALUE_MAX + 1];
                                        int ret = __system_property_get(prop, propVal);
                                        return ret == 0 ? std::string() : std::string(propVal);
                                    }
                                    
                                    /// @brief Reads android device name
                                    static std::string getDeviceName(void) {
                                        std::stringstream ss;
                                        std::string manufacturer = getProperty("ro.product.manufacturer");
                                        std::string model = getProperty("ro.product.model");
                                        if (manufacturer.empty() || model.empty()) {
                                            return std::string();
                                        }
                                        ss << manufacturer << "-" << model;
                                        return ss.str();
                                    }
#endif  // ELPP_OS_ANDROID
                                    
                                    /// @brief Runs command on terminal and returns the output.
                                    ///
                                    /// @detail This is applicable only on unix based systems, for all other OS, an empty string is returned.
                                    /// @param command Bash command
                                    /// @return Result of bash output or empty string if no result found.
                                    static const std::string getBashOutput(const char* command) {
#if (ELPP_OS_UNIX && !ELPP_OS_ANDROID && !ELPP_CYGWIN)
                                        if (command == nullptr) {
                                            return std::string();
                                        }
                                        FILE* proc = nullptr;
                                        if ((proc = popen(command, "r")) == nullptr) {
                                            ELPP_INTERNAL_ERROR("\nUnable to run command [" << command << "]", true);
                                            return std::string();
                                        }
                                        char hBuff[4096];
                                        if (fgets(hBuff, sizeof(hBuff), proc) != nullptr) {
                                            pclose(proc);
                                            if (hBuff[strlen(hBuff) - 1] == '\n') {
                                                hBuff[strlen(hBuff) - 1] = '\0';
                                            }
                                            return std::string(hBuff);
                                        }
                                        return std::string();
#else
                                        ELPP_UNUSED(command);
                                        return std::string();
#endif  // (ELPP_OS_UNIX && !ELPP_OS_ANDROID && !ELPP_CYGWIN)
                                    }
                                    
                                    /// @brief Gets environment variable. This is cross-platform and CRT safe (for VC++)
                                    /// @param variableName Environment variable name
                                    /// @param defaultVal If no environment variable or value found the value to return by default
                                    /// @param alternativeBashCommand If environment variable not found what would be alternative bash command
                                    ///        in order to look for value user is looking for. E.g, for 'user' alternative command will 'whoami'
                                    static std::string getEnvironmentVariable(const char* variableName, const char* defaultVal, const char* alternativeBashCommand = nullptr) {
#if ELPP_OS_UNIX
                                        const char* val = getenv(variableName);
#elif ELPP_OS_WINDOWS
                                        const char* val = getWindowsEnvironmentVariable(variableName);
#endif  // ELPP_OS_UNIX
                                        if ((val == nullptr) || ((strcmp(val, "") == 0))) {
#if ELPP_OS_UNIX && defined(ELPP_FORCE_ENV_VAR_FROM_BASH)
                                            // Try harder on unix-based systems
                                            std::string valBash = base::utils::OS::getBashOutput(alternativeBashCommand);
                                            if (valBash.empty()) {
                                                return std::string(defaultVal);
                                            } else {
                                                return valBash;
                                            }
#elif ELPP_OS_WINDOWS || ELPP_OS_UNIX
                                            ELPP_UNUSED(alternativeBashCommand);
                                            return std::string(defaultVal);
#endif  // ELPP_OS_UNIX && defined(ELPP_FORCE_ENV_VAR_FROM_BASH)
                                        }
                                        return std::string(val);
                                    }
                                    /// @brief Gets current username.
                                    static inline std::string currentUser(void) {
#if ELPP_OS_UNIX && !ELPP_OS_ANDROID
                                        return getEnvironmentVariable("USER", base::consts::kUnknownUser, "whoami");
#elif ELPP_OS_WINDOWS
                                        return getEnvironmentVariable("USERNAME", base::consts::kUnknownUser);
#elif ELPP_OS_ANDROID
                                        ELPP_UNUSED(base::consts::kUnknownUser);
                                        return std::string("android");
#else
                                        return std::string();
#endif  // ELPP_OS_UNIX && !ELPP_OS_ANDROID
                                    }
                                    
                                    /// @brief Gets current host name or computer name.
                                    ///
                                    /// @detail For android systems this is device name with its manufacturer and model seperated by hyphen
                                    static inline std::string currentHost(void) {
#if ELPP_OS_UNIX && !ELPP_OS_ANDROID
                                        return getEnvironmentVariable("HOSTNAME", base::consts::kUnknownHost, "hostname");
#elif ELPP_OS_WINDOWS
                                        return getEnvironmentVariable("COMPUTERNAME", base::consts::kUnknownHost);
#elif ELPP_OS_ANDROID
                                        ELPP_UNUSED(base::consts::kUnknownHost);
                                        return getDeviceName();
#else
                                        return std::string();
#endif  // ELPP_OS_UNIX && !ELPP_OS_ANDROID
                                    }
                                    /// @brief Whether or not terminal supports colors
                                    static inline bool termSupportsColor(void) {
                                        std::string term = getEnvironmentVariable("TERM", "");
                                        return term == "xterm" || term == "xterm-color" || term == "xterm-256color"
                                        || term == "screen" || term == "linux" || term == "cygwin"
                                        || term == "screen-256color";
                                    }
                                };
                                extern std::string s_currentUser;
                                extern std::string s_currentHost;
                                extern bool s_termSupportsColor;
#define ELPP_INITI_BASIC_DECLR \
namespace el {\
namespace base {\
namespace utils {\
std::string s_currentUser = el::base::utils::OS::currentUser(); \
std::string s_currentHost = el::base::utils::OS::currentHost(); \
bool s_termSupportsColor = el::base::utils::OS::termSupportsColor(); \
}\
}\
}
                                /// @brief Contains utilities for cross-platform date/time. This class make use of el::base::utils::Str
                                class DateTime : base::StaticClass {
                                public:
                                    /// @brief Cross platform gettimeofday for Windows and unix platform. This can be used to determine current millisecond.
                                    ///
                                    /// @detail For unix system it uses gettimeofday(timeval*, timezone*) and for Windows, a seperate implementation is provided
                                    /// @param [in,out] tv Pointer that gets updated
                                    static void gettimeofday(struct timeval* tv) {
#if ELPP_OS_WINDOWS
                                        if (tv != nullptr) {
#   if ELPP_COMPILER_MSVC || defined(_MSC_EXTENSIONS)
                                            const unsigned __int64 delta_ = 11644473600000000Ui64;
#   else
                                            const unsigned __int64 delta_ = 11644473600000000ULL;
#   endif  // ELPP_COMPILER_MSVC || defined(_MSC_EXTENSIONS)
                                            const double secOffSet = 0.000001;
                                            const unsigned long usecOffSet = 1000000;
                                            FILETIME fileTime;
                                            GetSystemTimeAsFileTime(&fileTime);
                                            unsigned __int64 present = 0;
                                            present |= fileTime.dwHighDateTime;
                                            present = present << 32;
                                            present |= fileTime.dwLowDateTime;
                                            present /= 10;  // mic-sec
                                            // Subtract the difference
                                            present -= delta_;
                                            tv->tv_sec = static_cast<long>(present * secOffSet);
                                            tv->tv_usec = static_cast<long>(present % usecOffSet);
                                        }
#else
                                        ::gettimeofday(tv, nullptr);
#endif  // ELPP_OS_WINDOWS
                                    }
                                    
                                    /// @brief Gets current date and time with milliseconds.
                                    /// @param format User provided date/time format
                                    /// @param msWidth A pointer to base::MillisecondsWidth from configuration (non-null)
                                    /// @returns string based date time in specified format.
                                    static inline std::string getDateTime(const char* format, const base::MillisecondsWidth* msWidth) {
                                        struct timeval currTime;
                                        gettimeofday(&currTime);
                                        struct ::tm timeInfo;
                                        buildTimeInfo(&currTime, &timeInfo);
                                        const int kBuffSize = 30;
                                        char buff_[kBuffSize] = "";
                                        parseFormat(buff_, kBuffSize, format, &timeInfo, static_cast<std::size_t>(currTime.tv_usec / msWidth->m_offset), msWidth);
                                        return std::string(buff_);
                                    }
                                    
                                    /// @brief Formats time to get unit accordingly, units like second if > 1000 or minutes if > 60000 etc
                                    static base::type::string_t formatTime(unsigned long long time, base::TimestampUnit timestampUnit) {
                                        double result = static_cast<double>(time);
                                        base::type::EnumType start = static_cast<base::type::EnumType>(timestampUnit);
                                        const base::type::char_t* unit = base::consts::kTimeFormats[start].unit;
                                        for (base::type::EnumType i = start; i < base::consts::kTimeFormatsCount - 1; ++i) {
                                            if (result <= base::consts::kTimeFormats[i].value) {
                                                break;
                                            }
                                            result /= base::consts::kTimeFormats[i].value;
                                            unit = base::consts::kTimeFormats[i + 1].unit;
                                        }
                                        base::type::stringstream_t ss;
                                        ss << result << " " << unit;
                                        return ss.str();
                                    }
                                    
                                    /// @brief Gets time difference in milli/micro second depending on timestampUnit
                                    static inline unsigned long long getTimeDifference(const struct timeval& endTime, const struct timeval& startTime, base::TimestampUnit timestampUnit) {
                                        if (timestampUnit == base::TimestampUnit::Microsecond) {
                                            return static_cast<unsigned long long>(static_cast<unsigned long long>(1000000 * endTime.tv_sec + endTime.tv_usec) -
                                                                                   static_cast<unsigned long long>(1000000 * startTime.tv_sec + startTime.tv_usec));
                                        } else {
                                            return static_cast<unsigned long long>((((endTime.tv_sec - startTime.tv_sec) * 1000000) + (endTime.tv_usec - startTime.tv_usec)) / 1000);
                                        }
                                    }
                                    
                                private:
                                    static inline struct ::tm* buildTimeInfo(struct timeval* currTime, struct ::tm* timeInfo) {
#if ELPP_OS_UNIX
                                        time_t rawTime = currTime->tv_sec;
                                        ::localtime_r(&rawTime, timeInfo);
                                        return timeInfo;
#else
#   if ELPP_COMPILER_MSVC
                                        ELPP_UNUSED(currTime);
                                        time_t t;
                                        _time64(&t);
                                        localtime_s(timeInfo, &t);
                                        return timeInfo;
#   else
                                        // For any other compilers that don't have CRT warnings issue e.g, MinGW or TDM GCC- we use different method
                                        time_t rawTime = currTime->tv_sec;
                                        struct tm* tmInf = localtime(&rawTime);
                                        *timeInfo = *tmInf;
                                        return timeInfo;
#   endif  // ELPP_COMPILER_MSVC
#endif  // ELPP_OS_UNIX
                                    }
                                    static char* parseFormat(char* buf, std::size_t bufSz, const char* format, const struct tm* tInfo,
                                                             std::size_t msec, const base::MillisecondsWidth* msWidth) {
                                        const char* bufLim = buf + bufSz;
                                        for (; *format; ++format) {
                                            if (*format == base::consts::kFormatSpecifierChar) {
                                                switch (*++format) {
                                                    case base::consts::kFormatSpecifierChar:  // Escape
                                                        break;
                                                    case '\0':  // End
                                                        --format;
                                                        break;
                                                    case 'd':  // Day
                                                        buf = base::utils::Str::convertAndAddToBuff(tInfo->tm_mday, 2, buf, bufLim);
                                                        continue;
                                                    case 'a':  // Day of week (short)
                                                        buf = base::utils::Str::addToBuff(base::consts::kDaysAbbrev[tInfo->tm_wday], buf, bufLim);
                                                        continue;
                                                    case 'A':  // Day of week (long)
                                                        buf = base::utils::Str::addToBuff(base::consts::kDays[tInfo->tm_wday], buf, bufLim);
                                                        continue;
                                                    case 'M':  // month
                                                        buf = base::utils::Str::convertAndAddToBuff(tInfo->tm_mon + 1, 2, buf, bufLim);
                                                        continue;
                                                    case 'b':  // month (short)
                                                        buf = base::utils::Str::addToBuff(base::consts::kMonthsAbbrev[tInfo->tm_mon], buf, bufLim);
                                                        continue;
                                                    case 'B':  // month (long)
                                                        buf = base::utils::Str::addToBuff(base::consts::kMonths[tInfo->tm_mon], buf, bufLim);
                                                        continue;
                                                    case 'y':  // year (two digits)
                                                        buf = base::utils::Str::convertAndAddToBuff(tInfo->tm_year + base::consts::kYearBase, 2, buf, bufLim);
                                                        continue;
                                                    case 'Y':  // year (four digits)
                                                        buf = base::utils::Str::convertAndAddToBuff(tInfo->tm_year + base::consts::kYearBase, 4, buf, bufLim);
                                                        continue;
                                                    case 'h':  // hour (12-hour)
                                                        buf = base::utils::Str::convertAndAddToBuff(tInfo->tm_hour % 12, 2, buf, bufLim);
                                                        continue;
                                                    case 'H':  // hour (24-hour)
                                                        buf = base::utils::Str::convertAndAddToBuff(tInfo->tm_hour, 2, buf, bufLim);
                                                        continue;
                                                    case 'm':  // minute
                                                        buf = base::utils::Str::convertAndAddToBuff(tInfo->tm_min, 2, buf, bufLim);
                                                        continue;
                                                    case 's':  // second
                                                        buf = base::utils::Str::convertAndAddToBuff(tInfo->tm_sec, 2, buf, bufLim);
                                                        continue;
                                                    case 'z':  // milliseconds
                                                    case 'g':
                                                        buf = base::utils::Str::convertAndAddToBuff(msec, msWidth->m_width, buf, bufLim);
                                                        continue;
                                                    case 'F':  // AM/PM
                                                        buf = base::utils::Str::addToBuff((tInfo->tm_hour >= 12) ? base::consts::kPm : base::consts::kAm, buf, bufLim);
                                                        continue;
                                                    default:
                                                        continue;
                                                }
                                            }
                                            if (buf == bufLim) break;
                                            *buf++ = *format;
                                        }
                                        return buf;
                                    }
                                };
                                /// @brief Command line arguments for application if specified using el::Helpers::setArgs(..) or START_EASYLOGGINGPP(..)
                                class CommandLineArgs {
                                public:
                                    CommandLineArgs(void) {
                                        setArgs(0, static_cast<char**>(nullptr));
                                    }
                                    CommandLineArgs(int argc, const char** argv) {
                                        setArgs(argc, argv);
                                    }
                                    CommandLineArgs(int argc, char** argv) {
                                        setArgs(argc, argv);
                                    }
                                    virtual ~CommandLineArgs(void) {}
                                    /// @brief Sets arguments and parses them
                                    inline void setArgs(int argc, const char** argv) {
                                        setArgs(argc, const_cast<char**>(argv));
                                    }
                                    /// @brief Sets arguments and parses them
                                    inline void setArgs(int argc, char** argv) {
                                        m_params.clear();
                                        m_paramsWithValue.clear();
                                        if (argc == 0 || argv == nullptr) {
                                            return;
                                        }
                                        m_argc = argc;
                                        m_argv = argv;
                                        for (int i = 1; i < m_argc; ++i) {
                                            const char* v = (strstr(m_argv[i], "="));
                                            if (v != nullptr && strlen(v) > 0) {
                                                std::string key = std::string(m_argv[i]);
                                                key = key.substr(0, key.find_first_of('='));
                                                if (hasParamWithValue(key.c_str())) {
                                                    ELPP_INTERNAL_INFO(1, "Skipping [" << key << "] arg since it already has value ["
                                                                       << getParamValue(key.c_str()) << "]");
                                                } else {
                                                    m_paramsWithValue.insert(std::make_pair(key, std::string(v + 1)));
                                                }
                                            }
                                            if (v == nullptr) {
                                                if (hasParam(m_argv[i])) {
                                                    ELPP_INTERNAL_INFO(1, "Skipping [" << m_argv[i] << "] arg since it already exists");
                                                } else {
                                                    m_params.push_back(std::string(m_argv[i]));
                                                }
                                            }
                                        }
                                    }
                                    /// @brief Returns true if arguments contain paramKey with a value (seperated by '=')
                                    inline bool hasParamWithValue(const char* paramKey) const {
                                        return m_paramsWithValue.find(std::string(paramKey)) != m_paramsWithValue.end();
                                    }
                                    /// @brief Returns value of arguments
                                    /// @see hasParamWithValue(const char*)
                                    inline const char* getParamValue(const char* paramKey) const {
                                        return m_paramsWithValue.find(std::string(paramKey))->second.c_str();
                                    }
                                    /// @brief Return true if arguments has a param (not having a value) i,e without '='
                                    inline bool hasParam(const char* paramKey) const {
                                        return std::find(m_params.begin(), m_params.end(), std::string(paramKey)) != m_params.end();
                                    }
                                    /// @brief Returns true if no params available. This exclude argv[0]
                                    inline bool empty(void) const {
                                        return m_params.empty() && m_paramsWithValue.empty();
                                    }
                                    /// @brief Returns total number of arguments. This exclude argv[0]
                                    inline std::size_t size(void) const {
                                        return m_params.size() + m_paramsWithValue.size();
                                    }
                                    inline friend base::type::ostream_t& operator<<(base::type::ostream_t& os, const CommandLineArgs& c) {
                                        for (int i = 1; i < c.m_argc; ++i) {
                                            os << ELPP_LITERAL("[") << c.m_argv[i] << ELPP_LITERAL("]");
                                            if (i < c.m_argc - 1) {
                                                os << ELPP_LITERAL(" ");
                                            }
                                        }
                                        return os;
                                    }
                                    
                                private:
                                    int m_argc;
                                    char** m_argv;
                                    std::map<std::string, std::string> m_paramsWithValue;
                                    std::vector<std::string> m_params;
                                };
                                /// @brief Abstract registry (aka repository) that provides basic interface for pointer repository specified by T_Ptr type.
                                ///
                                /// @detail Most of the functions are virtual final methods but anything implementing this abstract class should implement
                                /// unregisterAll() and deepCopy(const AbstractRegistry<T_Ptr, Container>&) and write registerNew() method according to container
                                /// and few more methods; get() to find element, unregister() to unregister single entry.
                                /// Please note that this is thread-unsafe and should also implement thread-safety mechanisms in implementation.
                                template <typename T_Ptr, typename Container>
                                class AbstractRegistry : public base::threading::ThreadSafe {
                                public:
                                    typedef typename Container::iterator iterator;
                                    typedef typename Container::const_iterator const_iterator;
                                    
                                    /// @brief Default constructor
                                    AbstractRegistry(void) {}
                                    
                                    /// @brief Move constructor that is useful for base classes
                                    AbstractRegistry(AbstractRegistry&& sr) {
                                        if (this == &sr) {
                                            return;
                                        }
                                        unregisterAll();
                                        m_list = std::move(sr.m_list);
                                    }
                                    
                                    bool operator==(const AbstractRegistry<T_Ptr, Container>& other) {
                                        if (size() != other.size()) {
                                            return false;
                                        }
                                        for (std::size_t i = 0; i < m_list.size(); ++i) {
                                            if (m_list.at(i) != other.m_list.at(i)) {
                                                return false;
                                            }
                                        }
                                        return true;
                                    }
                                    
                                    bool operator!=(const AbstractRegistry<T_Ptr, Container>& other) {
                                        if (size() != other.size()) {
                                            return true;
                                        }
                                        for (std::size_t i = 0; i < m_list.size(); ++i) {
                                            if (m_list.at(i) != other.m_list.at(i)) {
                                                return true;
                                            }
                                        }
                                        return false;
                                    }
                                    
                                    /// @brief Assignment move operator
                                    AbstractRegistry& operator=(AbstractRegistry&& sr) {
                                        if (this == &sr) {
                                            return *this;
                                        }
                                        unregisterAll();
                                        m_list = std::move(sr.m_list);
                                        return *this;
                                    }
                                    
                                    virtual ~AbstractRegistry(void) {
                                    }
                                    
                                    /// @return Iterator pointer from start of repository
                                    virtual inline iterator begin(void) ELPP_FINAL {
                                    return m_list.begin();
                                }
                                
                                /// @return Iterator pointer from end of repository
                                virtual inline iterator end(void) ELPP_FINAL {
                                return m_list.end();
                            }
                            
                            
                            /// @return Constant iterator pointer from start of repository
                            virtual inline const_iterator cbegin(void) const ELPP_FINAL {
                            return m_list.cbegin();
                        }
                        
                        /// @return End of repository
                        virtual inline const_iterator cend(void) const ELPP_FINAL {
                        return m_list.cend();
                    }
                    
                    /// @return Whether or not repository is empty
                    virtual inline bool empty(void) const ELPP_FINAL {
                    return m_list.empty();
                }
                
                /// @return Size of repository
                virtual inline std::size_t size(void) const ELPP_FINAL {
                return m_list.size();
            }
            
            /// @brief Returns underlying container by reference
            virtual inline Container& list(void) ELPP_FINAL {
            return m_list;
        }
        
        /// @brief Returns underlying container by constant reference.
        virtual inline const Container& list(void) const ELPP_FINAL {
        return m_list;
    }
    
    /// @brief Unregisters all the pointers from current repository.
    virtual void unregisterAll(void) = 0;
    
protected:
    virtual void deepCopy(const AbstractRegistry<T_Ptr, Container>&) = 0;
    void reinitDeepCopy(const AbstractRegistry<T_Ptr, Container>& sr) {
        unregisterAll();
        deepCopy(sr);
    }
    
private:
    Container m_list;
};

/// @brief A pointer registry mechanism to manage memory and provide search functionalities. (non-predicate version)
///
/// @detail NOTE: This is thread-unsafe implementation (although it contains lock function, it does not use these functions)
///         of AbstractRegistry<T_Ptr, Container>. Any implementation of this class should be
///         explicitly (by using lock functions)
template <typename T_Ptr, typename T_Key = const char*>
class Registry : public AbstractRegistry<T_Ptr, std::map<T_Key, T_Ptr*>> {
public:
    typedef typename Registry<T_Ptr, T_Key>::iterator iterator;
    typedef typename Registry<T_Ptr, T_Key>::const_iterator const_iterator;
    
    Registry(void) {}
    
    /// @brief Copy constructor that is useful for base classes. Try to avoid this constructor, use move constructor.
    Registry(const Registry& sr) : AbstractRegistry<T_Ptr, std::vector<T_Ptr*>>() {
        if (this == &sr) {
            return;
        }
        this->reinitDeepCopy(sr);
    }
    
    /// @brief Assignment operator that unregisters all the existing registeries and deeply copies each of repo element
    /// @see unregisterAll()
    /// @see deepCopy(const AbstractRegistry&)
    Registry& operator=(const Registry& sr) {
        if (this == &sr) {
            return *this;
        }
        this->reinitDeepCopy(sr);
        return *this;
    }
    
    virtual ~Registry(void) {
        unregisterAll();
    }
    
protected:
    virtual inline void unregisterAll(void) ELPP_FINAL {
    if (!this->empty()) {
        for (auto&& curr : this->list()) {
            base::utils::safeDelete(curr.second);
        }
        this->list().clear();
    }
}

/// @brief Registers new registry to repository.
virtual inline void registerNew(const T_Key& uniqKey, T_Ptr* ptr) ELPP_FINAL {
unregister(uniqKey);
this->list().insert(std::make_pair(uniqKey, ptr));
}

/// @brief Unregisters single entry mapped to specified unique key
inline void unregister(const T_Key& uniqKey) {
    T_Ptr* existing = get(uniqKey);
    if (existing != nullptr) {
        base::utils::safeDelete(existing);
        this->list().erase(uniqKey);
    }
}

/// @brief Gets pointer from repository. If none found, nullptr is returned.
inline T_Ptr* get(const T_Key& uniqKey) {
    iterator it = this->list().find(uniqKey);
    return it == this->list().end()
    ? nullptr
    : it->second;
}

private:
virtual inline void deepCopy(const AbstractRegistry<T_Ptr, std::map<T_Key, T_Ptr*>>& sr) ELPP_FINAL {
for (const_iterator it = sr.cbegin(); it != sr.cend(); ++it) {
    registerNew(it->first, new T_Ptr(*it->second));
}
}
};

/// @brief A pointer registry mechanism to manage memory and provide search functionalities. (predicate version)
///
/// @detail NOTE: This is thread-unsafe implementation of AbstractRegistry<T_Ptr, Container>. Any implementation of this class
/// should be made thread-safe explicitly
template <typename T_Ptr, typename Pred>
class RegistryWithPred : public AbstractRegistry<T_Ptr, std::vector<T_Ptr*>> {
public:
    typedef typename RegistryWithPred<T_Ptr, Pred>::iterator iterator;
    typedef typename RegistryWithPred<T_Ptr, Pred>::const_iterator const_iterator;
    
    RegistryWithPred(void) {
    }
    
    virtual ~RegistryWithPred(void) {
        unregisterAll();
    }
    
    /// @brief Copy constructor that is useful for base classes. Try to avoid this constructor, use move constructor.
    RegistryWithPred(const RegistryWithPred& sr) : AbstractRegistry<T_Ptr, std::vector<T_Ptr*>>() {
        if (this == &sr) {
            return;
        }
        this->reinitDeepCopy(sr);
    }
    
    /// @brief Assignment operator that unregisters all the existing registeries and deeply copies each of repo element
    /// @see unregisterAll()
    /// @see deepCopy(const AbstractRegistry&)
    RegistryWithPred& operator=(const RegistryWithPred& sr) {
        if (this == &sr) {
            return *this;
        }
        this->reinitDeepCopy(sr);
        return *this;
    }
    
    friend inline base::type::ostream_t& operator<<(base::type::ostream_t& os, const RegistryWithPred& sr) {
        for (const_iterator it = sr.list().begin(); it != sr.list().end(); ++it) {
            os << ELPP_LITERAL("    ") << **it << ELPP_LITERAL("\n");
        }
        return os;
    }
    
protected:
    virtual inline void unregisterAll(void) ELPP_FINAL {
    if (!this->empty()) {
        for (auto&& curr : this->list()) {
            base::utils::safeDelete(curr);
        }
        this->list().clear();
    }
}

virtual void unregister(T_Ptr*& ptr) ELPP_FINAL {
if (ptr) {
    iterator iter = this->begin();
    for (; iter != this->end(); ++iter) {
        if (ptr == *iter) {
            break;
        }
    }
    if (iter != this->end() && *iter != nullptr) {
        this->list().erase(iter);
        base::utils::safeDelete(*iter);
    }
}
}

virtual inline void registerNew(T_Ptr* ptr) ELPP_FINAL {
this->list().push_back(ptr);
}

/// @brief Gets pointer from repository with speicifed arguments. Arguments are passed to predicate
/// in order to validate pointer.
template <typename T, typename T2>
inline T_Ptr* get(const T& arg1, const T2 arg2) {
    iterator iter = std::find_if(this->list().begin(), this->list().end(), Pred(arg1, arg2));
    if (iter != this->list().end() && *iter != nullptr) {
        return *iter;
    }
    return nullptr;
}

private:
virtual inline void deepCopy(const AbstractRegistry<T_Ptr, std::vector<T_Ptr*>>& sr) {
    for (const_iterator it = sr.list().begin(); it != sr.list().end(); ++it) {
        registerNew(new T_Ptr(**it));
    }
}
};

}  // namespace utils
} // namespace base
/// @brief Base of Easylogging++ friendly class
///
/// @detail After inheriting this class publicly, implement pure-virtual function `void log(std::ostream&) const`
class Loggable {
public:
    virtual ~Loggable(void) {}
    virtual void log(el::base::type::ostream_t&) const = 0;
private:
    friend inline el::base::type::ostream_t& operator<<(el::base::type::ostream_t& os, const Loggable& loggable) {
        loggable.log(os);
        return os;
    }
};
namespace base {
    /// @brief Represents log format containing flags and date format. This is used internally to start initial log
    class LogFormat : public Loggable {
    public:
        LogFormat(void) :
        m_level(Level::Unknown),
        m_userFormat(base::type::string_t()),
        m_format(base::type::string_t()),
        m_dateTimeFormat(std::string()),
        m_flags(0x0) {
        }
        
        LogFormat(Level level, const base::type::string_t& format)
        : m_level(level), m_userFormat(format) {
            parseFromFormat(m_userFormat);
        }
        
        LogFormat(const LogFormat& logFormat) {
            m_level = logFormat.m_level;
            m_userFormat = logFormat.m_userFormat;
            m_format = logFormat.m_format;
            m_dateTimeFormat = logFormat.m_dateTimeFormat;
            m_flags = logFormat.m_flags;
        }
        
        LogFormat(LogFormat&& logFormat) {
            m_level = std::move(logFormat.m_level);
            m_userFormat = std::move(logFormat.m_userFormat);
            m_format = std::move(logFormat.m_format);
            m_dateTimeFormat = std::move(logFormat.m_dateTimeFormat);
            m_flags = std::move(logFormat.m_flags);
        }
        
        LogFormat& operator=(const LogFormat& logFormat) {
            m_level = logFormat.m_level;
            m_userFormat = logFormat.m_userFormat;
            m_dateTimeFormat = logFormat.m_dateTimeFormat;
            m_flags = logFormat.m_flags;
            return *this;
        }
        
        virtual ~LogFormat(void) {
        }
        
        inline bool operator==(const LogFormat& other) {
            return m_level == other.m_level && m_userFormat == other.m_userFormat && m_format == other.m_format &&
            m_dateTimeFormat == other.m_dateTimeFormat && m_flags == other.m_flags;
        }
        
        /// @brief Updates format to be used while logging.
        /// @param userFormat User provided format
        void parseFromFormat(const base::type::string_t& userFormat) {
            // We make copy because we will be changing the format
            // i.e, removing user provided date format from original format
            // and then storing it.
            base::type::string_t formatCopy = userFormat;
            m_flags = 0x0;
            auto conditionalAddFlag = [&](const base::type::char_t* specifier, base::FormatFlags flag) {
                std::size_t foundAt = base::type::string_t::npos;
                while ((foundAt = formatCopy.find(specifier, foundAt + 1)) != base::type::string_t::npos){
                    if (foundAt > 0 && formatCopy[foundAt - 1] == base::consts::kFormatSpecifierChar) {
                        if (hasFlag(flag)) {
                            // If we already have flag we remove the escape chars so that '%%' is turned to '%'
                            // even after specifier resolution - this is because we only replaceFirst specifier
                            formatCopy.erase(foundAt > 0 ? foundAt - 1 : 0, 1);
                            ++foundAt;
                        }
                    } else {
                        if (!hasFlag(flag)) addFlag(flag);
                    }
                }
            };
            conditionalAddFlag(base::consts::kAppNameFormatSpecifier, base::FormatFlags::AppName);
            conditionalAddFlag(base::consts::kSeverityLevelFormatSpecifier, base::FormatFlags::Level);
            conditionalAddFlag(base::consts::kSeverityLevelShortFormatSpecifier, base::FormatFlags::LevelShort);
            conditionalAddFlag(base::consts::kLoggerIdFormatSpecifier, base::FormatFlags::LoggerId);
            conditionalAddFlag(base::consts::kThreadIdFormatSpecifier, base::FormatFlags::ThreadId);
            conditionalAddFlag(base::consts::kLogFileFormatSpecifier, base::FormatFlags::File);
            conditionalAddFlag(base::consts::kLogFileBaseFormatSpecifier, base::FormatFlags::FileBase);
            conditionalAddFlag(base::consts::kLogLineFormatSpecifier, base::FormatFlags::Line);
            conditionalAddFlag(base::consts::kLogLocationFormatSpecifier, base::FormatFlags::Location);
            conditionalAddFlag(base::consts::kLogFunctionFormatSpecifier, base::FormatFlags::Function);
            conditionalAddFlag(base::consts::kCurrentUserFormatSpecifier, base::FormatFlags::User);
            conditionalAddFlag(base::consts::kCurrentHostFormatSpecifier, base::FormatFlags::Host);
            conditionalAddFlag(base::consts::kMessageFormatSpecifier, base::FormatFlags::LogMessage);
            conditionalAddFlag(base::consts::kVerboseLevelFormatSpecifier, base::FormatFlags::VerboseLevel);
            // For date/time we need to extract user's date format first
            std::size_t dateIndex = std::string::npos;
            if ((dateIndex = formatCopy.find(base::consts::kDateTimeFormatSpecifier)) != std::string::npos) {
                while (dateIndex > 0 && formatCopy[dateIndex - 1] == base::consts::kFormatSpecifierChar) {
                    dateIndex = formatCopy.find(base::consts::kDateTimeFormatSpecifier, dateIndex + 1);
                }
                if (dateIndex != std::string::npos) {
                    addFlag(base::FormatFlags::DateTime);
                    updateDateFormat(dateIndex, formatCopy);
                }
            }
            m_format = formatCopy;
            updateFormatSpec();
        }
        
        inline Level level(void) const {
            return m_level;
        }
        
        inline const base::type::string_t& userFormat(void) const {
            return m_userFormat;
        }
        
        inline const base::type::string_t& format(void) const {
            return m_format;
        }
        
        inline const std::string& dateTimeFormat(void) const {
            return m_dateTimeFormat;
        }
        
        inline base::type::EnumType flags(void) const {
            return m_flags;
        }
        
        inline bool hasFlag(base::FormatFlags flag) const {
            return base::utils::hasFlag(flag, m_flags);
        }
        
        virtual void log(el::base::type::ostream_t& os) const {
            os << m_format;
        }
        
    protected:
        /// @brief Updates date time format if available in currFormat.
        /// @param index Index where %datetime, %date or %time was found
        /// @param [in,out] currFormat current format that is being used to format
        virtual void updateDateFormat(std::size_t index, base::type::string_t& currFormat) ELPP_FINAL {
            if (hasFlag(base::FormatFlags::DateTime)) {
                index += ELPP_STRLEN(base::consts::kDateTimeFormatSpecifier);
            }
            const base::type::char_t* ptr = currFormat.c_str() + index;
            if ((currFormat.size() > index) && (ptr[0] == '{')) {
                // User has provided format for date/time
                ++ptr;
                int count = 1;  // Start by 1 in order to remove starting brace
                std::stringstream ss;
                for (; *ptr; ++ptr, ++count) {
                    if (*ptr == '}') {
                        ++count;  // In order to remove ending brace
                        break;
                    }
                    ss << *ptr;
                }
                currFormat.erase(index, count);
                m_dateTimeFormat = ss.str();
            } else {
                // No format provided, use default
                if (hasFlag(base::FormatFlags::DateTime)) {
                    m_dateTimeFormat = std::string(base::consts::kDefaultDateTimeFormat);
                }
            }
        }
        
        /// @brief Updates %level from format. This is so that we dont have to do it at log-writing-time. It uses m_format and m_level
        virtual void updateFormatSpec(void) ELPP_FINAL {
            // Do not use switch over strongly typed enums because Intel C++ compilers dont support them yet.
            if (m_level == Level::Debug) {
                base::utils::Str::replaceFirstWithEscape(m_format, base::consts::kSeverityLevelFormatSpecifier,
                                                         base::consts::kDebugLevelLogValue);
                base::utils::Str::replaceFirstWithEscape(m_format, base::consts::kSeverityLevelShortFormatSpecifier,
                                                         base::consts::kDebugLevelShortLogValue);
            } else if (m_level == Level::Info) {
                base::utils::Str::replaceFirstWithEscape(m_format, base::consts::kSeverityLevelFormatSpecifier,
                                                         base::consts::kInfoLevelLogValue);
                base::utils::Str::replaceFirstWithEscape(m_format, base::consts::kSeverityLevelShortFormatSpecifier,
                                                         base::consts::kInfoLevelShortLogValue);
            } else if (m_level == Level::Warning) {
                base::utils::Str::replaceFirstWithEscape(m_format, base::consts::kSeverityLevelFormatSpecifier,
                                                         base::consts::kWarningLevelLogValue);
                base::utils::Str::replaceFirstWithEscape(m_format, base::consts::kSeverityLevelShortFormatSpecifier,
                                                         base::consts::kWarningLevelShortLogValue);
            } else if (m_level == Level::Error) {
                base::utils::Str::replaceFirstWithEscape(m_format, base::consts::kSeverityLevelFormatSpecifier,
                                                         base::consts::kErrorLevelLogValue);
                base::utils::Str::replaceFirstWithEscape(m_format, base::consts::kSeverityLevelShortFormatSpecifier,
                                                         base::consts::kErrorLevelShortLogValue);
            } else if (m_level == Level::Fatal) {
                base::utils::Str::replaceFirstWithEscape(m_format, base::consts::kSeverityLevelFormatSpecifier,
                                                         base::consts::kFatalLevelLogValue);
                base::utils::Str::replaceFirstWithEscape(m_format, base::consts::kSeverityLevelShortFormatSpecifier,
                                                         base::consts::kFatalLevelShortLogValue);
            } else if (m_level == Level::Verbose) {
                base::utils::Str::replaceFirstWithEscape(m_format, base::consts::kSeverityLevelFormatSpecifier,
                                                         base::consts::kVerboseLevelLogValue);
                base::utils::Str::replaceFirstWithEscape(m_format, base::consts::kSeverityLevelShortFormatSpecifier,
                                                         base::consts::kVerboseLevelShortLogValue);
            } else if (m_level == Level::Trace) {
                base::utils::Str::replaceFirstWithEscape(m_format, base::consts::kSeverityLevelFormatSpecifier,
                                                         base::consts::kTraceLevelLogValue);
                base::utils::Str::replaceFirstWithEscape(m_format, base::consts::kSeverityLevelShortFormatSpecifier,
                                                         base::consts::kTraceLevelShortLogValue);
            }
            if (hasFlag(base::FormatFlags::User)) {
                std::string s = base::utils::s_currentUser;
                base::utils::Str::replaceFirstWithEscape(m_format, base::consts::kCurrentUserFormatSpecifier,
                                                         base::utils::s_currentUser);
            }
            if (hasFlag(base::FormatFlags::Host)) {
                base::utils::Str::replaceFirstWithEscape(m_format, base::consts::kCurrentHostFormatSpecifier,
                                                         base::utils::s_currentHost);
            }
            // Ignore Level::Global and Level::Unknown
        }
        
        inline void addFlag(base::FormatFlags flag) {
            base::utils::addFlag(flag, &m_flags);
        }
        
    private:
        Level m_level;
        base::type::string_t m_userFormat;
        base::type::string_t m_format;
        std::string m_dateTimeFormat;
        base::type::EnumType m_flags;
        friend class el::Logger;  // To resolve loggerId format specifier easily
    };
}  // namespace base
/// @brief Resolving function for format specifier
typedef std::function<const char*(void)> FormatSpecifierValueResolver;
/// @brief User-provided custom format specifier
/// @see el::Helpers::installCustomFormatSpecifier
/// @see FormatSpecifierValueResolver
class CustomFormatSpecifier {
public:
    CustomFormatSpecifier(const char* formatSpecifier, const FormatSpecifierValueResolver& resolver) :
    m_formatSpecifier(formatSpecifier), m_resolver(resolver) {}
    inline const char* formatSpecifier(void) const { return m_formatSpecifier; }
    inline const FormatSpecifierValueResolver& resolver(void) const { return m_resolver; }
    inline bool operator==(const char* formatSpecifier) {
        return strcmp(m_formatSpecifier, formatSpecifier) == 0;
    }
    
private:
    const char* m_formatSpecifier;
    FormatSpecifierValueResolver m_resolver;
};
/// @brief Represents single configuration that has representing level, configuration type and a string based value.
///
/// @detail String based value means any value either its boolean, integer or string itself, it will be embedded inside quotes
/// and will be parsed later.
///
/// Consider some examples below:
///   * el::Configuration confEnabledInfo(el::Level::Info, el::ConfigurationType::Enabled, "true");
///   * el::Configuration confMaxLogFileSizeInfo(el::Level::Info, el::ConfigurationType::MaxLogFileSize, "2048");
///   * el::Configuration confFilenameInfo(el::Level::Info, el::ConfigurationType::Filename, "/var/log/my.log");
class Configuration : public Loggable {
public:
    Configuration(const Configuration& c) :
    m_level(c.m_level),
    m_configurationType(c.m_configurationType),
    m_value(c.m_value) {
    }
    
    Configuration& operator=(const Configuration& c) {
        m_level = c.m_level;
        m_configurationType = c.m_configurationType;
        m_value = c.m_value;
        return *this;
    }
    
    virtual ~Configuration(void) {
    }
    
    /// @brief Full constructor used to sets value of configuration
    Configuration(Level level, ConfigurationType configurationType, const std::string& value) :
    m_level(level),
    m_configurationType(configurationType),
    m_value(value) {
    }
    
    /// @brief Gets level of current configuration
    inline Level level(void) const {
        return m_level;
    }
    
    /// @brief Gets configuration type of current configuration
    inline ConfigurationType configurationType(void) const {
        return m_configurationType;
    }
    
    /// @brief Gets string based configuration value
    inline const std::string& value(void) const {
        return m_value;
    }
    
    /// @brief Set string based configuration value
    /// @param value Value to set. Values have to be std::string; For boolean values use "true", "false", for any integral values
    ///        use them in quotes. They will be parsed when configuring
    inline void setValue(const std::string& value) {
        m_value = value;
    }
    
    virtual inline void log(el::base::type::ostream_t& os) const {
        os << LevelHelper::convertToString(m_level)
        << ELPP_LITERAL(" ") << ConfigurationTypeHelper::convertToString(m_configurationType)
        << ELPP_LITERAL(" = ") << m_value.c_str();
    }
    
    /// @brief Used to find configuration from configuration (pointers) repository. Avoid using it.
    class Predicate {
    public:
        Predicate(Level level, ConfigurationType configurationType) :
        m_level(level),
        m_configurationType(configurationType) {
        }
        
        inline bool operator()(const Configuration* conf) const {
            return ((conf != nullptr) && (conf->level() == m_level) && (conf->configurationType() == m_configurationType));
        }
        
    private:
        Level m_level;
        ConfigurationType m_configurationType;
    };
    
private:
    Level m_level;
    ConfigurationType m_configurationType;
    std::string m_value;
};

/// @brief Thread-safe Configuration repository
///
/// @detail This repository represents configurations for all the levels and configuration type mapped to a value.
class Configurations : public base::utils::RegistryWithPred<Configuration, Configuration::Predicate> {
public:
    /// @brief Default constructor with empty repository
    Configurations(void) :
    m_configurationFile(std::string()),
    m_isFromFile(false) {
    }
    
    /// @brief Constructor used to set configurations using configuration file.
    /// @param configurationFile Full path to configuration file
    /// @param useDefaultsForRemaining Lets you set the remaining configurations to default.
    /// @param base If provided, this configuration will be based off existing repository that this argument is pointing to.
    /// @see parseFromFile(const std::string&, Configurations* base)
    /// @see setRemainingToDefault()
    Configurations(const std::string& configurationFile, bool useDefaultsForRemaining = true, Configurations* base = nullptr) :
    m_configurationFile(configurationFile),
    m_isFromFile(false) {
        parseFromFile(configurationFile, base);
        if (useDefaultsForRemaining) {
            setRemainingToDefault();
        }
    }
    
    virtual ~Configurations(void) {
    }
    
    /// @brief Parses configuration from file.
    /// @param configurationFile Full path to configuration file
    /// @param base Configurations to base new configuration repository off. This value is used when you want to use
    ///        existing Configurations to base all the values and then set rest of configuration via configuration file.
    /// @return True if successfully parsed, false otherwise. You may define 'ELPP_DEBUG_ASSERT_FAILURE' to make sure you
    ///         do not proceed without successful parse.
    inline bool parseFromFile(const std::string& configurationFile, Configurations* base = nullptr) {
        // We initial assertion with true because if we have assertion diabled, we want to pass this
        // check and if assertion is enabled we will have values re-assigned any way.
        bool assertionPassed = true;
        ELPP_ASSERT((assertionPassed = base::utils::File::pathExists(configurationFile.c_str(), true)),
                    "Configuration file [" << configurationFile << "] does not exist!");
        if (!assertionPassed) {
            return false;
        }
        bool success = Parser::parseFromFile(configurationFile, this, base);
        m_isFromFile = success;
        return success;
    }
    
    /// @brief Parse configurations from configuration string.
    ///
    /// @detail This configuration string has same syntax as configuration file contents. Make sure all the necessary
    /// new line characters are provided.
    /// @param base Configurations to base new configuration repository off. This value is used when you want to use
    ///        existing Configurations to base all the values and then set rest of configuration via configuration text.
    /// @return True if successfully parsed, false otherwise. You may define 'ELPP_DEBUG_ASSERT_FAILURE' to make sure you
    ///         do not proceed without successful parse.
    inline bool parseFromText(const std::string& configurationsString, Configurations* base = nullptr) {
        bool success = Parser::parseFromText(configurationsString, this, base);
        if (success) {
            m_isFromFile = false;
        }
        return success;
    }
    
    /// @brief Sets configuration based-off an existing configurations.
    /// @param base Pointer to existing configurations.
    inline void setFromBase(Configurations* base) {
        if (base == nullptr || base == this) {
            return;
        }
        base::threading::ScopedLock scopedLock(base->lock());
        for (Configuration*& conf : base->list()) {
            set(conf);
        }
    }
    
    /// @brief Determines whether or not specified configuration type exists in the repository.
    ///
    /// @detail Returns as soon as first level is found.
    /// @param configurationType Type of configuration to check existence for.
    bool hasConfiguration(ConfigurationType configurationType) {
        base::type::EnumType lIndex = LevelHelper::kMinValid;
        bool result = false;
        LevelHelper::forEachLevel(&lIndex, [&](void) -> bool {
            if (hasConfiguration(LevelHelper::castFromInt(lIndex), configurationType)) {
                result = true;
            }
            return result;
        });
        return result;
    }
    
    /// @brief Determines whether or not specified configuration type exists for specified level
    /// @param level Level to check
    /// @param configurationType Type of configuration to check existence for.
    inline bool hasConfiguration(Level level, ConfigurationType configurationType) {
        base::threading::ScopedLock scopedLock(lock());
#if ELPP_COMPILER_INTEL
        // We cant specify template types here, Intel C++ throws compilation error
        // "error: type name is not allowed"
        return RegistryWithPred::get(level, configurationType) != nullptr;
#else
        return RegistryWithPred<Configuration, Configuration::Predicate>::get(level, configurationType) != nullptr;
#endif  // ELPP_COMPILER_INTEL
    }
    
    /// @brief Sets value of configuration for specified level.
    ///
    /// @detail Any existing configuration for specified level will be replaced. Also note that configuration types
    /// ConfigurationType::MillisecondsWidth and ConfigurationType::PerformanceTracking will be ignored if not set for
    /// Level::Global because these configurations are not dependant on level.
    /// @param level Level to set configuration for (el::Level).
    /// @param configurationType Type of configuration (el::ConfigurationType)
    /// @param value A string based value. Regardless of what the data type of configuration is, it will always be string
    /// from users' point of view. This is then parsed later to be used internally.
    /// @see Configuration::setValue(const std::string& value)
    /// @see el::Level
    /// @see el::ConfigurationType
    inline void set(Level level, ConfigurationType configurationType, const std::string& value) {
        base::threading::ScopedLock scopedLock(lock());
        unsafeSet(level, configurationType, value);  // This is not unsafe anymore as we have locked mutex
        if (level == Level::Global) {
            unsafeSetGlobally(configurationType, value, false);  // Again this is not unsafe either
        }
    }
    
    /// @brief Sets single configuration based on other single configuration.
    /// @see set(Level level, ConfigurationType configurationType, const std::string& value)
    inline void set(Configuration* conf) {
        if (conf == nullptr) {
            return;
        }
        set(conf->level(), conf->configurationType(), conf->value());
    }
    
    inline Configuration* get(Level level, ConfigurationType configurationType) {
        base::threading::ScopedLock scopedLock(lock());
        return RegistryWithPred<Configuration, Configuration::Predicate>::get(level, configurationType);
    }
    
    /// @brief Sets configuration for all levels.
    /// @param configurationType Type of configuration
    /// @param value String based value
    /// @see Configurations::set(Level level, ConfigurationType configurationType, const std::string& value)
    inline void setGlobally(ConfigurationType configurationType, const std::string& value) {
        setGlobally(configurationType, value, false);
    }
    
    /// @brief Clears repository so that all the configurations are unset
    inline void clear(void) {
        base::threading::ScopedLock scopedLock(lock());
        unregisterAll();
    }
    
    /// @brief Gets configuration file used in parsing this configurations.
    ///
    /// @detail If this repository was set manually or by text this returns empty string.
    inline const std::string& configurationFile(void) const {
        return m_configurationFile;
    }
    
    /// @brief Sets configurations to "factory based" configurations.
    void setToDefault(void) {
        setGlobally(ConfigurationType::Enabled, std::string("true"), true);
#if !defined(ELPP_NO_DEFAULT_LOG_FILE)
        setGlobally(ConfigurationType::Filename, std::string(base::consts::kDefaultLogFile), true);
#else
        ELPP_UNUSED(base::consts::kDefaultLogFile);
#endif  // !defined(ELPP_NO_DEFAULT_LOG_FILE)
        setGlobally(ConfigurationType::ToFile, std::string("true"), true);
        setGlobally(ConfigurationType::ToStandardOutput, std::string("true"), true);
        setGlobally(ConfigurationType::MillisecondsWidth, std::string("3"), true);
        setGlobally(ConfigurationType::PerformanceTracking, std::string("true"), true);
        setGlobally(ConfigurationType::MaxLogFileSize, std::string("0"), true);
        setGlobally(ConfigurationType::LogFlushThreshold, std::string("0"), true);
        
        setGlobally(ConfigurationType::Format, std::string("%datetime %level [%logger] %msg"), true);
        set(Level::Debug, ConfigurationType::Format, std::string("%datetime %level [%logger] [%user@%host] [%func] [%loc] %msg"));
        // INFO and WARNING are set to default by Level::Global
        set(Level::Error, ConfigurationType::Format, std::string("%datetime %level [%logger] %msg"));
        set(Level::Fatal, ConfigurationType::Format, std::string("%datetime %level [%logger] %msg"));
        set(Level::Verbose, ConfigurationType::Format, std::string("%datetime %level-%vlevel [%logger] %msg"));
        set(Level::Trace, ConfigurationType::Format, std::string("%datetime %level [%logger] [%func] [%loc] %msg"));
    }
    
    /// @brief Lets you set the remaining configurations to default.
    ///
    /// @detail By remaining, it means that the level/type a configuration does not exist for.
    /// This function is useful when you want to minimize chances of failures, e.g, if you have a configuration file that sets
    /// configuration for all the configurations except for Enabled or not, we use this so that ENABLED is set to default i.e,
    /// true. If you dont do this explicitley (either by calling this function or by using second param in Constructor
    /// and try to access a value, an error is thrown
    void setRemainingToDefault(void) {
        base::threading::ScopedLock scopedLock(lock());
        unsafeSetIfNotExist(Level::Global, ConfigurationType::Enabled, std::string("true"));
#if !defined(ELPP_NO_DEFAULT_LOG_FILE)
        unsafeSetIfNotExist(Level::Global, ConfigurationType::Filename, std::string(base::consts::kDefaultLogFile));
#endif  // !defined(ELPP_NO_DEFAULT_LOG_FILE)
        unsafeSetIfNotExist(Level::Global, ConfigurationType::ToFile, std::string("true"));
        unsafeSetIfNotExist(Level::Global, ConfigurationType::ToStandardOutput, std::string("true"));
        unsafeSetIfNotExist(Level::Global, ConfigurationType::MillisecondsWidth, std::string("3"));
        unsafeSetIfNotExist(Level::Global, ConfigurationType::PerformanceTracking, std::string("true"));
        unsafeSetIfNotExist(Level::Global, ConfigurationType::MaxLogFileSize, std::string("0"));
        unsafeSetIfNotExist(Level::Global, ConfigurationType::Format, std::string("%datetime %level [%logger] %msg"));
        unsafeSetIfNotExist(Level::Debug, ConfigurationType::Format,
                            std::string("%datetime %level [%logger] [%user@%host] [%func] [%loc] %msg"));
        // INFO and WARNING are set to default by Level::Global
        unsafeSetIfNotExist(Level::Error, ConfigurationType::Format, std::string("%datetime %level [%logger] %msg"));
        unsafeSetIfNotExist(Level::Fatal, ConfigurationType::Format, std::string("%datetime %level [%logger] %msg"));
        unsafeSetIfNotExist(Level::Verbose, ConfigurationType::Format, std::string("%datetime %level-%vlevel [%logger] %msg"));
        unsafeSetIfNotExist(Level::Trace, ConfigurationType::Format, std::string("%datetime %level [%logger] [%func] [%loc] %msg"));
    }
    
    /// @brief Parser used internally to parse configurations from file or text.
    ///
    /// @detail This class makes use of base::utils::Str.
    /// You should not need this unless you are working on some tool for Easylogging++
    class Parser : base::StaticClass {
    public:
        /// @brief Parses configuration from file.
        /// @param configurationFile Full path to configuration file
        /// @param sender Sender configurations pointer. Usually 'this' is used from calling class
        /// @param base Configurations to base new configuration repository off. This value is used when you want to use
        ///        existing Configurations to base all the values and then set rest of configuration via configuration file.
        /// @return True if successfully parsed, false otherwise. You may define '_STOP_ON_FIRSTELPP_ASSERTION' to make sure you
        ///         do not proceed without successful parse.
        static bool parseFromFile(const std::string& configurationFile, Configurations* sender, Configurations* base = nullptr) {
            sender->setFromBase(base);
            std::ifstream fileStream_(configurationFile.c_str(), std::ifstream::in);
            ELPP_ASSERT(fileStream_.is_open(), "Unable to open configuration file [" << configurationFile << "] for parsing.");
            bool parsedSuccessfully = false;
            std::string line = std::string();
            Level currLevel = Level::Unknown;
            std::string currConfigStr = std::string();
            std::string currLevelStr = std::string();
            while (fileStream_.good()) {
                std::getline(fileStream_, line);
                parsedSuccessfully = parseLine(&line, &currConfigStr, &currLevelStr, &currLevel, sender);
                ELPP_ASSERT(parsedSuccessfully, "Unable to parse configuration line: " << line);
            }
            return parsedSuccessfully;
        }
        
        /// @brief Parse configurations from configuration string.
        ///
        /// @detail This configuration string has same syntax as configuration file contents. Make sure all the necessary
        /// new line characters are provided. You may define '_STOP_ON_FIRSTELPP_ASSERTION' to make sure you
        /// do not proceed without successful parse (This is recommended)
        /// @param configurationsString
        /// @param sender Sender configurations pointer. Usually 'this' is used from calling class
        /// @param base Configurations to base new configuration repository off. This value is used when you want to use
        ///        existing Configurations to base all the values and then set rest of configuration via configuration text.
        /// @return True if successfully parsed, false otherwise.
        static bool parseFromText(const std::string& configurationsString, Configurations* sender, Configurations* base = nullptr) {
            sender->setFromBase(base);
            bool parsedSuccessfully = false;
            std::stringstream ss(configurationsString);
            std::string line = std::string();
            Level currLevel = Level::Unknown;
            std::string currConfigStr = std::string();
            std::string currLevelStr = std::string();
            while (std::getline(ss, line)) {
                parsedSuccessfully = parseLine(&line, &currConfigStr, &currLevelStr, &currLevel, sender);
                ELPP_ASSERT(parsedSuccessfully, "Unable to parse configuration line: " << line);
            }
            return parsedSuccessfully;
        }
        
    private:
        friend class el::Loggers;
        static void ignoreComments(std::string* line) {
            std::size_t foundAt = 0;
            std::size_t quotesStart = line->find("\"");
            std::size_t quotesEnd = std::string::npos;
            if (quotesStart != std::string::npos) {
                quotesEnd = line->find("\"", quotesStart + 1);
                while (quotesEnd != std::string::npos && line->at(quotesEnd - 1) == '\\') {
                    // Do not erase slash yet - we will erase it in parseLine(..) while loop
                    quotesEnd = line->find("\"", quotesEnd + 2);
                }
            }
            if ((foundAt = line->find(base::consts::kConfigurationComment)) != std::string::npos) {
                if (foundAt < quotesEnd) {
                    foundAt = line->find(base::consts::kConfigurationComment, quotesEnd + 1);
                }
                *line = line->substr(0, foundAt);
            }
        }
        static inline bool isLevel(const std::string& line) {
            return base::utils::Str::startsWith(line, std::string(base::consts::kConfigurationLevel));
        }
        
        static inline bool isComment(const std::string& line) {
            return base::utils::Str::startsWith(line, std::string(base::consts::kConfigurationComment));
        }
        
        static inline bool isConfig(const std::string& line) {
            std::size_t assignment = line.find('=');
            return line != "" &&
            ((line[0] >= 65 && line[0] <= 90) || (line[0] >= 97 && line[0] <= 122)) &&
            (assignment != std::string::npos) &&
            (line.size() > assignment);
        }
        
        static bool parseLine(std::string* line, std::string* currConfigStr, std::string* currLevelStr, Level* currLevel, Configurations* conf) {
            ConfigurationType currConfig = ConfigurationType::Unknown;
            std::string currValue = std::string();
            *line = base::utils::Str::trim(*line);
            if (isComment(*line)) return true;
            ignoreComments(line);
            *line = base::utils::Str::trim(*line);
            if (line->empty()) {
                // Comment ignored
                return true;
            }
            if (isLevel(*line)) {
                if (line->size() <= 2) {
                    return true;
                }
                *currLevelStr = line->substr(1, line->size() - 2);
                *currLevelStr = base::utils::Str::toUpper(*currLevelStr);
                *currLevelStr = base::utils::Str::trim(*currLevelStr);
                *currLevel = LevelHelper::convertFromString(currLevelStr->c_str());
                return true;
            }
            if (isConfig(*line)) {
                std::size_t assignment = line->find('=');
                *currConfigStr = line->substr(0, assignment);
                *currConfigStr = base::utils::Str::toUpper(*currConfigStr);
                *currConfigStr = base::utils::Str::trim(*currConfigStr);
                currConfig = ConfigurationTypeHelper::convertFromString(currConfigStr->c_str());
                currValue = line->substr(assignment + 1);
                currValue = base::utils::Str::trim(currValue);
                std::size_t quotesStart = currValue.find("\"", 0);
                std::size_t quotesEnd = std::string::npos;
                if (quotesStart != std::string::npos) {
                    quotesEnd = currValue.find("\"", quotesStart + 1);
                    while (quotesEnd != std::string::npos && currValue.at(quotesEnd - 1) == '\\') {
                        currValue = currValue.erase(quotesEnd - 1, 1);
                        quotesEnd = currValue.find("\"", quotesEnd + 2);
                    }
                }
                if (quotesStart != std::string::npos && quotesEnd != std::string::npos) {
                    // Quote provided - check and strip if valid
                    ELPP_ASSERT((quotesStart < quotesEnd), "Configuration error - No ending quote found in ["
                                << currConfigStr << "]");
                    ELPP_ASSERT((quotesStart + 1 != quotesEnd), "Empty configuration value for [" << currConfigStr << "]");
                    if ((quotesStart != quotesEnd) && (quotesStart + 1 != quotesEnd)) {
                        // Explicit check in case if assertion is disabled
                        currValue = currValue.substr(quotesStart + 1, quotesEnd - 1);
                    }
                }
            }
            ELPP_ASSERT(*currLevel != Level::Unknown, "Unrecognized severity level [" << *currLevelStr << "]");
            ELPP_ASSERT(currConfig != ConfigurationType::Unknown, "Unrecognized configuration [" << *currConfigStr << "]");
            if (*currLevel == Level::Unknown || currConfig == ConfigurationType::Unknown) {
                return false;  // unrecognizable level or config
            }
            conf->set(*currLevel, currConfig, currValue);
            return true;
        }
    };
    
private:
    std::string m_configurationFile;
    bool m_isFromFile;
    friend class el::Loggers;
    
    /// @brief Unsafely sets configuration if does not already exist
    void unsafeSetIfNotExist(Level level, ConfigurationType configurationType, const std::string& value) {
        Configuration* conf = RegistryWithPred<Configuration, Configuration::Predicate>::get(level, configurationType);
        if (conf == nullptr) {
            unsafeSet(level, configurationType, value);
        }
    }
    
    /// @brief Thread unsafe set
    void unsafeSet(Level level, ConfigurationType configurationType, const std::string& value) {
        Configuration* conf = RegistryWithPred<Configuration, Configuration::Predicate>::get(level, configurationType);
        if (conf == nullptr) {
            registerNew(new Configuration(level, configurationType, value));
        } else {
            conf->setValue(value);
        }
        if (level == Level::Global) {
            unsafeSetGlobally(configurationType, value, false);
        }
    }
    
    /// @brief Sets configurations for all levels including Level::Global if includeGlobalLevel is true
    /// @see Configurations::setGlobally(ConfigurationType configurationType, const std::string& value)
    void setGlobally(ConfigurationType configurationType, const std::string& value, bool includeGlobalLevel) {
        if (includeGlobalLevel) {
            set(Level::Global, configurationType, value);
        }
        base::type::EnumType lIndex = LevelHelper::kMinValid;
        LevelHelper::forEachLevel(&lIndex, [&](void) -> bool {
            set(LevelHelper::castFromInt(lIndex), configurationType, value);
            return false;  // Do not break lambda function yet as we need to set all levels regardless
        });
    }
    
    /// @brief Sets configurations (Unsafely) for all levels including Level::Global if includeGlobalLevel is true
    /// @see Configurations::setGlobally(ConfigurationType configurationType, const std::string& value)
    void unsafeSetGlobally(ConfigurationType configurationType, const std::string& value, bool includeGlobalLevel) {
        if (includeGlobalLevel) {
            unsafeSet(Level::Global, configurationType, value);
        }
        base::type::EnumType lIndex = LevelHelper::kMinValid;
        LevelHelper::forEachLevel(&lIndex, [&](void) -> bool  {
            unsafeSet(LevelHelper::castFromInt(lIndex), configurationType, value);
            return false;  // Do not break lambda function yet as we need to set all levels regardless
        });
    }
};

namespace base {
    typedef std::shared_ptr<base::type::fstream_t> FileStreamPtr;
    typedef std::map<std::string, FileStreamPtr> LogStreamsReferenceMap;
    /// @brief Configurations with data types.
    ///
    /// @detail el::Configurations have string based values. This is whats used internally in order to read correct configurations.
    /// This is to perform faster while writing logs using correct configurations.
    ///
    /// This is thread safe and final class containing non-virtual destructor (means nothing should inherit this class)
    class TypedConfigurations : public base::threading::ThreadSafe {
    public:
        /// @brief Constructor to initialize (construct) the object off el::Configurations
        /// @param configurations Configurations pointer/reference to base this typed configurations off.
        /// @param logStreamsReference Use ELPP->registeredLoggers()->logStreamsReference()
        TypedConfigurations(Configurations* configurations, base::LogStreamsReferenceMap* logStreamsReference) {
            m_configurations = configurations;
            m_logStreamsReference = logStreamsReference;
            build(m_configurations);
        }
        
        TypedConfigurations(const TypedConfigurations& other) {
            this->m_configurations = other.m_configurations;
            this->m_logStreamsReference = other.m_logStreamsReference;
            build(m_configurations);
        }
        
        virtual ~TypedConfigurations(void) {
        }
        
        const Configurations* configurations(void) const {
            return m_configurations;
        }
        
        inline bool enabled(Level level) {
            return getConfigByVal<bool>(level, &m_enabledMap, "enabled");
        }
        
        inline bool toFile(Level level) {
            return getConfigByVal<bool>(level, &m_toFileMap, "toFile");
        }
        
        inline const std::string& filename(Level level) {
            return getConfigByRef<std::string>(level, &m_filenameMap, "filename");
        }
        
        inline bool toStandardOutput(Level level) {
            return getConfigByVal<bool>(level, &m_toStandardOutputMap, "toStandardOutput");
        }
        
        inline const base::LogFormat& logFormat(Level level) {
            return getConfigByRef<base::LogFormat>(level, &m_logFormatMap, "logFormat");
        }
        
        inline const base::MillisecondsWidth& millisecondsWidth(Level level = Level::Global) {
            return getConfigByRef<base::MillisecondsWidth>(level, &m_millisecondsWidthMap, "millisecondsWidth");
        }
        
        inline bool performanceTracking(Level level = Level::Global) {
            return getConfigByVal<bool>(level, &m_performanceTrackingMap, "performanceTracking");
        }
        
        inline base::type::fstream_t* fileStream(Level level) {
            return getConfigByRef<base::FileStreamPtr>(level, &m_fileStreamMap, "fileStream").get();
        }
        
        inline std::size_t maxLogFileSize(Level level) {
            return getConfigByVal<std::size_t>(level, &m_maxLogFileSizeMap, "maxLogFileSize");
        }
        
        inline std::size_t logFlushThreshold(Level level) {
            return getConfigByVal<std::size_t>(level, &m_logFlushThresholdMap, "logFlushThreshold");
        }
        
    private:
        Configurations* m_configurations;
        std::map<Level, bool> m_enabledMap;
        std::map<Level, bool> m_toFileMap;
        std::map<Level, std::string> m_filenameMap;
        std::map<Level, bool> m_toStandardOutputMap;
        std::map<Level, base::LogFormat> m_logFormatMap;
        std::map<Level, base::MillisecondsWidth> m_millisecondsWidthMap;
        std::map<Level, bool> m_performanceTrackingMap;
        std::map<Level, base::FileStreamPtr> m_fileStreamMap;
        std::map<Level, std::size_t> m_maxLogFileSizeMap;
        std::map<Level, std::size_t> m_logFlushThresholdMap;
        base::LogStreamsReferenceMap* m_logStreamsReference;
        
        friend class el::Helpers;
        friend class el::base::MessageBuilder;
        friend class el::base::Writer;
        friend class el::base::DefaultLogDispatchCallback;
        friend class el::base::LogDispatcher;
        
        template <typename Conf_T>
        inline Conf_T getConfigByVal(Level level, const std::map<Level, Conf_T>* confMap, const char* confName) {
            base::threading::ScopedLock scopedLock(lock());
            return unsafeGetConfigByVal(level, confMap, confName);  // This is not unsafe anymore - mutex locked in scope
        }
        
        template <typename Conf_T>
        inline Conf_T& getConfigByRef(Level level, std::map<Level, Conf_T>* confMap, const char* confName) {
            base::threading::ScopedLock scopedLock(lock());
            return unsafeGetConfigByRef(level, confMap, confName);  // This is not unsafe anymore - mutex locked in scope
        }
        
        template <typename Conf_T>
        inline Conf_T unsafeGetConfigByVal(Level level, const std::map<Level, Conf_T>* confMap, const char* confName) {
            ELPP_UNUSED(confName);
            typename std::map<Level, Conf_T>::const_iterator it = confMap->find(level);
            if (it == confMap->end()) {
                try {
                    return confMap->at(Level::Global);
                } catch (...) {
                    ELPP_INTERNAL_ERROR("Unable to get configuration [" << confName << "] for level ["
                                        << LevelHelper::convertToString(level) << "]"
                                        << std::endl << "Please ensure you have properly configured logger.", false);
                    return Conf_T();
                }
            }
            return it->second;
        }
        
        template <typename Conf_T>
        inline Conf_T& unsafeGetConfigByRef(Level level, std::map<Level, Conf_T>* confMap, const char* confName) {
            ELPP_UNUSED(confName);
            typename std::map<Level, Conf_T>::iterator it = confMap->find(level);
            if (it == confMap->end()) {
                try {
                    return confMap->at(Level::Global);
                } catch (...) {
                    ELPP_INTERNAL_ERROR("Unable to get configuration [" << confName << "] for level ["
                                        << LevelHelper::convertToString(level) << "]"
                                        << std::endl << "Please ensure you have properly configured logger.", false);
                }
            }
            return it->second;
        }
        
        template <typename Conf_T>
        void setValue(Level level, const Conf_T& value, std::map<Level, Conf_T>* confMap, bool includeGlobalLevel = true) {
            // If map is empty and we are allowed to add into generic level (Level::Global), do it!
            if (confMap->empty() && includeGlobalLevel) {
                confMap->insert(std::make_pair(Level::Global, value));
                return;
            }
            // If same value exist in generic level already, dont add it to explicit level
            typename std::map<Level, Conf_T>::iterator it = confMap->find(Level::Global);
            if (it != confMap->end() && it->second == value) {
                return;
            }
            // Now make sure we dont double up values if we really need to add it to explicit level
            it = confMap->find(level);
            if (it == confMap->end()) {
                // Value not found for level, add new
                confMap->insert(std::make_pair(level, value));
            } else {
                // Value found, just update value
                confMap->at(level) = value;
            }
        }
        
        void build(Configurations* configurations) {
            base::threading::ScopedLock scopedLock(lock());
            auto getBool = [] (std::string boolStr) -> bool {  // Pass by value for trimming
                base::utils::Str::trim(boolStr);
                return (boolStr == "TRUE" || boolStr == "true" || boolStr == "1");
            };
            std::vector<Configuration*> withFileSizeLimit;
            for (Configurations::const_iterator it = configurations->begin(); it != configurations->end(); ++it) {
                Configuration* conf = *it;
                // We cannot use switch on strong enums because Intel C++ dont support them yet
                if (conf->configurationType() == ConfigurationType::Enabled) {
                    setValue(conf->level(), getBool(conf->value()), &m_enabledMap);
                } else if (conf->configurationType() == ConfigurationType::ToFile) {
                    setValue(conf->level(), getBool(conf->value()), &m_toFileMap);
                } else if (conf->configurationType() == ConfigurationType::ToStandardOutput) {
                    setValue(conf->level(), getBool(conf->value()), &m_toStandardOutputMap);
                } else if (conf->configurationType() == ConfigurationType::Filename) {
                    // We do not yet configure filename but we will configure in another
                    // loop. This is because if file cannot be created, we will force ToFile
                    // to be false. Because configuring logger is not necessarily performance
                    // sensative operation, we can live with another loop; (by the way this loop
                    // is not very heavy either)
                } else if (conf->configurationType() == ConfigurationType::Format) {
                    setValue(conf->level(), base::LogFormat(conf->level(),
                                                            base::type::string_t(conf->value().begin(), conf->value().end())), &m_logFormatMap);
                } else if (conf->configurationType() == ConfigurationType::MillisecondsWidth) {
                    setValue(Level::Global,
                             base::MillisecondsWidth(static_cast<int>(getULong(conf->value()))), &m_millisecondsWidthMap);
                } else if (conf->configurationType() == ConfigurationType::PerformanceTracking) {
                    setValue(Level::Global, getBool(conf->value()), &m_performanceTrackingMap);
                } else if (conf->configurationType() == ConfigurationType::MaxLogFileSize) {
                    setValue(conf->level(), static_cast<std::size_t>(getULong(conf->value())), &m_maxLogFileSizeMap);
#if !defined(ELPP_NO_DEFAULT_LOG_FILE)
                    withFileSizeLimit.push_back(conf);
#endif  // !defined(ELPP_NO_DEFAULT_LOG_FILE)
                } else if (conf->configurationType() == ConfigurationType::LogFlushThreshold) {
                    setValue(conf->level(), static_cast<std::size_t>(getULong(conf->value())), &m_logFlushThresholdMap);
                }
            }
            // As mentioned early, we will now set filename configuration in separate loop to deal with non-existent files
            for (Configurations::const_iterator it = configurations->begin(); it != configurations->end(); ++it) {
                Configuration* conf = *it;
                if (conf->configurationType() == ConfigurationType::Filename) {
                    insertFile(conf->level(), conf->value());
                }
            }
            for (std::vector<Configuration*>::iterator conf = withFileSizeLimit.begin();
                 conf != withFileSizeLimit.end(); ++conf) {
                // This is not unsafe as mutex is locked in currect scope
                unsafeValidateFileRolling((*conf)->level(), base::defaultPreRollOutCallback);
            }
        }
        
        unsigned long getULong(std::string confVal) {
            bool valid = true;
            base::utils::Str::trim(confVal);
            valid = !confVal.empty() && std::find_if(confVal.begin(), confVal.end(),
                                                     [](char c) { return !base::utils::Str::isDigit(c); }) == confVal.end();
            if (!valid) {
                valid = false;
                ELPP_ASSERT(valid, "Configuration value not a valid integer [" << confVal << "]");
                return 0;
            }
            return atol(confVal.c_str());
        }
        
        std::string resolveFilename(const std::string& filename) {
            std::string resultingFilename = filename;
            std::size_t dateIndex = std::string::npos;
            std::string dateTimeFormatSpecifierStr = std::string(base::consts::kDateTimeFormatSpecifierForFilename);
            if ((dateIndex = resultingFilename.find(dateTimeFormatSpecifierStr.c_str())) != std::string::npos) {
                while (dateIndex > 0 && resultingFilename[dateIndex - 1] == base::consts::kFormatSpecifierChar) {
                    dateIndex = resultingFilename.find(dateTimeFormatSpecifierStr.c_str(), dateIndex + 1);
                }
                if (dateIndex != std::string::npos) {
                    const char* ptr = resultingFilename.c_str() + dateIndex;
                    // Goto end of specifier
                    ptr += dateTimeFormatSpecifierStr.size();
                    std::string fmt;
                    if ((resultingFilename.size() > dateIndex) && (ptr[0] == '{')) {
                        // User has provided format for date/time
                        ++ptr;
                        int count = 1;  // Start by 1 in order to remove starting brace
                        std::stringstream ss;
                        for (; *ptr; ++ptr, ++count) {
                            if (*ptr == '}') {
                                ++count;  // In order to remove ending brace
                                break;
                            }
                            ss << *ptr;
                        }
                        resultingFilename.erase(dateIndex + dateTimeFormatSpecifierStr.size(), count);
                        fmt = ss.str();
                    } else {
                        fmt = std::string(base::consts::kDefaultDateTimeFormatInFilename);
                    }
                    base::MillisecondsWidth msWidth(3);
                    std::string now = base::utils::DateTime::getDateTime(fmt.c_str(), &msWidth);
                    base::utils::Str::replaceAll(now, '/', '-'); // Replace path element since we are dealing with filename
                    base::utils::Str::replaceAll(resultingFilename, dateTimeFormatSpecifierStr, now);
                }
            }
            return resultingFilename;
        }
        
        void insertFile(Level level, const std::string& fullFilename) {
            std::string resolvedFilename = resolveFilename(fullFilename);
            if (resolvedFilename.empty()) {
                std::cerr << "Could not load empty file for logging, please re-check your configurations for level ["
                << LevelHelper::convertToString(level) << "]";
            }
            std::string filePath = base::utils::File::extractPathFromFilename(resolvedFilename, base::consts::kFilePathSeperator);
            if (filePath.size() < resolvedFilename.size()) {
                base::utils::File::createPath(filePath);
            }
            auto create = [&](Level level) {
                base::LogStreamsReferenceMap::iterator filestreamIter = m_logStreamsReference->find(resolvedFilename);
                base::type::fstream_t* fs = nullptr;
                if (filestreamIter == m_logStreamsReference->end()) {
                    // We need a completely new stream, nothing to share with
                    fs = base::utils::File::newFileStream(resolvedFilename);
                    m_filenameMap.insert(std::make_pair(level, resolvedFilename));
                    m_fileStreamMap.insert(std::make_pair(level, base::FileStreamPtr(fs)));
                    m_logStreamsReference->insert(std::make_pair(resolvedFilename, base::FileStreamPtr(m_fileStreamMap.at(level))));
                } else {
                    // Woops! we have an existing one, share it!
                    m_filenameMap.insert(std::make_pair(level, filestreamIter->first));
                    m_fileStreamMap.insert(std::make_pair(level, base::FileStreamPtr(filestreamIter->second)));
                    fs = filestreamIter->second.get();
                }
                if (fs == nullptr) {
                    // We display bad file error from newFileStream()
                    ELPP_INTERNAL_ERROR("Setting [TO_FILE] of ["
                                        << LevelHelper::convertToString(level) << "] to FALSE", false);
                    setValue(level, false, &m_toFileMap);
                }
            };
            // If we dont have file conf for any level, create it for Level::Global first
            // otherwise create for specified level
            create(m_filenameMap.empty() && m_fileStreamMap.empty() ? Level::Global : level);
        }
        
        bool unsafeValidateFileRolling(Level level, const PreRollOutCallback& PreRollOutCallback) {
            base::type::fstream_t* fs = unsafeGetConfigByRef(level, &m_fileStreamMap, "fileStream").get();
            if (fs == nullptr) {
                return true;
            }
            std::size_t maxLogFileSize = unsafeGetConfigByVal(level, &m_maxLogFileSizeMap, "maxLogFileSize");
            std::size_t currFileSize = base::utils::File::getSizeOfFile(fs);
            if (maxLogFileSize != 0 && currFileSize >= maxLogFileSize) {
                std::string fname = unsafeGetConfigByRef(level, &m_filenameMap, "filename");
                ELPP_INTERNAL_INFO(1, "Truncating log file [" << fname << "] as a result of configurations for level ["
                                   << LevelHelper::convertToString(level) << "]");
                fs->close();
                PreRollOutCallback(fname.c_str(), currFileSize);
                fs->open(fname, std::fstream::out | std::fstream::trunc);
                return true;
            }
            return false;
        }
        
        bool validateFileRolling(Level level, const PreRollOutCallback& PreRollOutCallback) {
            base::threading::ScopedLock scopedLock(lock());
            return unsafeValidateFileRolling(level, PreRollOutCallback);
        }
    };
    /// @brief Class that keeps record of current line hit for occasional logging
    class HitCounter {
    public:
        HitCounter(void) :
        m_filename(""),
        m_lineNumber(0),
        m_hitCounts(0) {
        }
        
        HitCounter(const char* filename, unsigned long int lineNumber) :
        m_filename(filename),
        m_lineNumber(lineNumber),
        m_hitCounts(0) {
        }
        
        HitCounter(const HitCounter& hitCounter) :
        m_filename(hitCounter.m_filename),
        m_lineNumber(hitCounter.m_lineNumber),
        m_hitCounts(hitCounter.m_hitCounts) {
        }
        
        HitCounter& operator=(const HitCounter& hitCounter) {
            m_filename = hitCounter.m_filename;
            m_lineNumber = hitCounter.m_lineNumber;
            m_hitCounts = hitCounter.m_hitCounts;
            return *this;
        }
        
        virtual ~HitCounter(void) {
        }
        
        /// @brief Resets location of current hit counter
        inline void resetLocation(const char* filename, unsigned long int lineNumber) {
            m_filename = filename;
            m_lineNumber = lineNumber;
        }
        
        /// @brief Validates hit counts and resets it if necessary
        inline void validateHitCounts(std::size_t n) {
            if (m_hitCounts >= base::consts::kMaxLogPerCounter) {
                m_hitCounts = (n >= 1 ? base::consts::kMaxLogPerCounter % n : 0);
            }
            ++m_hitCounts;
        }
        
        inline const char* filename(void) const {
            return m_filename;
        }
        
        inline unsigned long int lineNumber(void) const {
            return m_lineNumber;
        }
        
        inline std::size_t hitCounts(void) const {
            return m_hitCounts;
        }
        
        inline void increment(void) {
            ++m_hitCounts;
        }
        
        class Predicate {
        public:
            Predicate(const char* filename, unsigned long int lineNumber)
            : m_filename(filename),
            m_lineNumber(lineNumber) {
            }
            inline bool operator()(const HitCounter* counter) {
                return ((counter != nullptr) &&
                        (strcmp(counter->m_filename, m_filename) == 0) &&
                        (counter->m_lineNumber == m_lineNumber));
            }
            
        private:
            const char* m_filename;
            unsigned long int m_lineNumber;
        };
        
    private:
        const char* m_filename;
        unsigned long int m_lineNumber;
        std::size_t m_hitCounts;
    };
    /// @brief Repository for hit counters used across the application
    class RegisteredHitCounters : public base::utils::RegistryWithPred<base::HitCounter, base::HitCounter::Predicate> {
    public:
        /// @brief Validates counter for every N, i.e, registers new if does not exist otherwise updates original one
        /// @return True if validation resulted in triggering hit. Meaning logs should be written everytime true is returned
        bool validateEveryN(const char* filename, unsigned long int lineNumber, std::size_t n) {
            base::threading::ScopedLock scopedLock(lock());
            base::HitCounter* counter = get(filename, lineNumber);
            if (counter == nullptr) {
                registerNew(counter = new base::HitCounter(filename, lineNumber));
            }
            counter->validateHitCounts(n);
            bool result = (n >= 1 && counter->hitCounts() != 0 && counter->hitCounts() % n == 0);
            return result;
        }
        
        /// @brief Validates counter for hits >= N, i.e, registers new if does not exist otherwise updates original one
        /// @return True if validation resulted in triggering hit. Meaning logs should be written everytime true is returned
        bool validateAfterN(const char* filename, unsigned long int lineNumber, std::size_t n) {
            base::threading::ScopedLock scopedLock(lock());
            base::HitCounter* counter = get(filename, lineNumber);
            if (counter == nullptr) {
                registerNew(counter = new base::HitCounter(filename, lineNumber));
            }
            // Do not use validateHitCounts here since we do not want to reset counter here
            // Note the >= instead of > because we are incrementing
            // after this check
            if (counter->hitCounts() >= n)
                return true;
            counter->increment();
            return false;
        }
        
        /// @brief Validates counter for hits are <= n, i.e, registers new if does not exist otherwise updates original one
        /// @return True if validation resulted in triggering hit. Meaning logs should be written everytime true is returned
        bool validateNTimes(const char* filename, unsigned long int lineNumber, std::size_t n) {
            base::threading::ScopedLock scopedLock(lock());
            base::HitCounter* counter = get(filename, lineNumber);
            if (counter == nullptr) {
                registerNew(counter = new base::HitCounter(filename, lineNumber));
            }
            counter->increment();
            // Do not use validateHitCounts here since we do not want to reset counter here
            if (counter->hitCounts() <= n)
                return true;
            return false;
        }
        
        /// @brief Gets hit counter registered at specified position
        inline const base::HitCounter* getCounter(const char* filename, unsigned long int lineNumber) {
            base::threading::ScopedLock scopedLock(lock());
            return get(filename, lineNumber);
        }
    };
    /// @brief Action to be taken for dispatching
    enum class DispatchAction : base::type::EnumType {
        None = 1, NormalLog = 2, SysLog = 4
        };
    }  // namespace base
    template <typename T>
    class Callback : protected base::threading::ThreadSafe {
    public:
        Callback(void) : m_enabled(true) {}
        inline bool enabled(void) const { return m_enabled; }
        inline void setEnabled(bool enabled) {
            base::threading::ScopedLock scopedLock(lock());
            m_enabled = enabled;
        }
    protected:
        virtual void handle(const T* handlePtr) = 0;
    private:
        bool m_enabled;
    };
    class LogDispatchData {
    public:
        LogDispatchData() : m_logMessage(nullptr), m_dispatchAction(base::DispatchAction::None) {}
        inline const LogMessage* logMessage(void) const { return m_logMessage; }
        inline base::DispatchAction dispatchAction(void) const { return m_dispatchAction; }
    private:
        LogMessage* m_logMessage;
        base::DispatchAction m_dispatchAction;
        friend class base::LogDispatcher;
        
        inline void setLogMessage(LogMessage* logMessage) { m_logMessage = logMessage; }
        inline void setDispatchAction(base::DispatchAction dispatchAction) { m_dispatchAction = dispatchAction; }
    };
    class LogDispatchCallback : public Callback<LogDispatchData> {
    private:
        friend class base::LogDispatcher;
    };
    class PerformanceTrackingCallback : public Callback<PerformanceTrackingData> {
    private:
        friend class base::PerformanceTracker;
    };
    class LogBuilder : base::NoCopy {
    public:
        virtual ~LogBuilder(void) { ELPP_INTERNAL_INFO(3, "Destroying log builder...")}
        virtual base::type::string_t build(const LogMessage* logMessage, bool appendNewLine) const = 0;
        void convertToColoredOutput(base::type::string_t* logLine, Level level) {
            if (!base::utils::s_termSupportsColor) return;
            const base::type::char_t* resetColor = ELPP_LITERAL("\x1b[0m");
            if (level == Level::Error || level == Level::Fatal)
                *logLine = ELPP_LITERAL("\x1b[31m") + *logLine + resetColor;
            else if (level == Level::Warning)
                *logLine = ELPP_LITERAL("\x1b[33m") + *logLine + resetColor;
            else if (level == Level::Debug)
                *logLine = ELPP_LITERAL("\x1b[32m") + *logLine + resetColor;
            else if (level == Level::Info)
                *logLine = ELPP_LITERAL("\x1b[36m") + *logLine + resetColor;
            else if (level == Level::Trace)
                *logLine = ELPP_LITERAL("\x1b[35m") + *logLine + resetColor;
        }
    private:
        friend class el::base::DefaultLogDispatchCallback;
    };
    typedef std::shared_ptr<LogBuilder> LogBuilderPtr;
    /// @brief Represents a logger holding ID and configurations we need to write logs
    ///
    /// @detail This class does not write logs itself instead its used by writer to read configuations from.
    class Logger : public base::threading::ThreadSafe, public Loggable {
    public:
        Logger(const std::string& id, base::LogStreamsReferenceMap* logStreamsReference) :
        m_id(id),
        m_typedConfigurations(nullptr),
        m_parentApplicationName(std::string()),
        m_isConfigured(false),
        m_logStreamsReference(logStreamsReference) {
            initUnflushedCount();
        }
        
        Logger(const std::string& id, const Configurations& configurations, base::LogStreamsReferenceMap* logStreamsReference) :
        m_id(id),
        m_typedConfigurations(nullptr),
        m_parentApplicationName(std::string()),
        m_isConfigured(false),
        m_logStreamsReference(logStreamsReference) {
            initUnflushedCount();
            configure(configurations);
        }
        
        Logger(const Logger& logger) {
            base::utils::safeDelete(m_typedConfigurations);
            m_id = logger.m_id;
            m_typedConfigurations = logger.m_typedConfigurations;
            m_parentApplicationName = logger.m_parentApplicationName;
            m_isConfigured = logger.m_isConfigured;
            m_configurations = logger.m_configurations;
            m_unflushedCount = logger.m_unflushedCount;
            m_logStreamsReference = logger.m_logStreamsReference;
        }
        
        Logger& operator=(const Logger& logger) {
            base::utils::safeDelete(m_typedConfigurations);
            m_id = logger.m_id;
            m_typedConfigurations = logger.m_typedConfigurations;
            m_parentApplicationName = logger.m_parentApplicationName;
            m_isConfigured = logger.m_isConfigured;
            m_configurations = logger.m_configurations;
            m_unflushedCount = logger.m_unflushedCount;
            m_logStreamsReference = logger.m_logStreamsReference;
            return *this;
        }
        
        virtual ~Logger(void) {
            base::utils::safeDelete(m_typedConfigurations);
        }
        
        virtual inline void log(el::base::type::ostream_t& os) const {
            os << m_id.c_str();
        }
        
        /// @brief Configures the logger using specified configurations.
        void configure(const Configurations& configurations) {
            m_isConfigured = false;  // we set it to false in case if we fail
            initUnflushedCount();
            if (m_typedConfigurations != nullptr) {
                Configurations* c = const_cast<Configurations*>(m_typedConfigurations->configurations());
                if (c->hasConfiguration(Level::Global, ConfigurationType::Filename)) {
                    // This check is definitely needed for cases like ELPP_NO_DEFAULT_LOG_FILE
                    flush();
                }
            }
            base::threading::ScopedLock scopedLock(lock());
            if (m_configurations != configurations) {
                m_configurations.setFromBase(const_cast<Configurations*>(&configurations));
            }
            base::utils::safeDelete(m_typedConfigurations);
            m_typedConfigurations = new base::TypedConfigurations(&m_configurations, m_logStreamsReference);
            resolveLoggerFormatSpec();
            m_isConfigured = true;
        }
        
        /// @brief Reconfigures logger using existing configurations
        inline void reconfigure(void) {
            ELPP_INTERNAL_INFO(1, "Reconfiguring logger [" << m_id << "]");
            configure(m_configurations);
        }
        
        inline const std::string& id(void) const {
            return m_id;
        }
        
        inline const std::string& parentApplicationName(void) const {
            return m_parentApplicationName;
        }
        
        inline void setParentApplicationName(const std::string& parentApplicationName) {
            m_parentApplicationName = parentApplicationName;
        }
        
        inline Configurations* configurations(void) {
            return &m_configurations;
        }
        
        inline base::TypedConfigurations* typedConfigurations(void) {
            return m_typedConfigurations;
        }
        
        static inline bool isValidId(const std::string& id) {
            for (std::string::const_iterator it = id.begin(); it != id.end(); ++it) {
                if (!base::utils::Str::contains(base::consts::kValidLoggerIdSymbols, *it)) {
                    return false;
                }
            }
            return true;
        }
        /// @brief Flushes logger to sync all log files for all levels
        inline void flush(void) {
            ELPP_INTERNAL_INFO(3, "Flushing logger [" << m_id << "] all levels");
            base::threading::ScopedLock scopedLock(lock());
            base::type::EnumType lIndex = LevelHelper::kMinValid;
            LevelHelper::forEachLevel(&lIndex, [&](void) -> bool {
                flush(LevelHelper::castFromInt(lIndex), nullptr);
                return false;
            });
        }
        
        inline void flush(Level level, base::type::fstream_t* fs) {
            if (fs == nullptr && m_typedConfigurations->toFile(level)) {
                fs = m_typedConfigurations->fileStream(level);
            }
            if (fs != nullptr) {
                fs->flush();
                m_unflushedCount.find(level)->second = 0;
            }
        }
        
        inline bool isFlushNeeded(Level level) {
            return ++m_unflushedCount.find(level)->second >= m_typedConfigurations->logFlushThreshold(level);
        }
        
        inline LogBuilder* logBuilder(void) const {
            return m_logBuilder.get();
        }
        
        inline void setLogBuilder(const LogBuilderPtr& logBuilder) {
            m_logBuilder = logBuilder;
        }
        
        inline bool enabled(Level level) const {
            return m_typedConfigurations->enabled(level);
        }
        
#if ELPP_VARIADIC_TEMPLATES_SUPPORTED
#   define LOGGER_LEVEL_WRITERS_SIGNATURES(FUNCTION_NAME)\
template <typename T, typename... Args>\
inline void FUNCTION_NAME(const char*, const T&, const Args&...);\
template <typename T>\
inline void FUNCTION_NAME(const T&);
        
        template <typename T, typename... Args>
        inline void verbose(int, const char*, const T&, const Args&...);
        
        template <typename T>
        inline void verbose(int, const T&);
        
        LOGGER_LEVEL_WRITERS_SIGNATURES(info)
        LOGGER_LEVEL_WRITERS_SIGNATURES(debug)
        LOGGER_LEVEL_WRITERS_SIGNATURES(warn)
        LOGGER_LEVEL_WRITERS_SIGNATURES(error)
        LOGGER_LEVEL_WRITERS_SIGNATURES(fatal)
        LOGGER_LEVEL_WRITERS_SIGNATURES(trace)
#   undef LOGGER_LEVEL_WRITERS_SIGNATURES
#endif // ELPP_VARIADIC_TEMPLATES_SUPPORTED
    private:
        std::string m_id;
        base::TypedConfigurations* m_typedConfigurations;
        base::type::stringstream_t m_stream;
        std::string m_parentApplicationName;
        bool m_isConfigured;
        Configurations m_configurations;
        std::map<Level, unsigned int> m_unflushedCount;
        base::LogStreamsReferenceMap* m_logStreamsReference;
        LogBuilderPtr m_logBuilder;
        
        friend class el::LogMessage;
        friend class el::Loggers;
        friend class el::Helpers;
        friend class el::base::RegisteredLoggers;
        friend class el::base::DefaultLogDispatchCallback;
        friend class el::base::MessageBuilder;
        friend class el::base::Writer;
        friend class el::base::PErrorWriter;
        friend class el::base::Storage;
        friend class el::base::PerformanceTracker;
        friend class el::base::LogDispatcher;
        
        Logger(void);
        
#if ELPP_VARIADIC_TEMPLATES_SUPPORTED
        template <typename T, typename... Args>
        void log_(Level, int, const char*, const T&, const Args&...);
        
        template <typename T>
        inline void log_(Level, int, const T&);
        
        template <typename T, typename... Args>
        void log(Level, const char*, const T&, const Args&...);
        
        template <typename T>
        inline void log(Level, const T&);
#endif // ELPP_VARIADIC_TEMPLATES_SUPPORTED
        
        void initUnflushedCount(void) {
            m_unflushedCount.clear();
            base::type::EnumType lIndex = LevelHelper::kMinValid;
            LevelHelper::forEachLevel(&lIndex, [&](void) -> bool {
                m_unflushedCount.insert(std::make_pair(LevelHelper::castFromInt(lIndex), 0));
                return false;
            });
        }
        
        inline base::type::stringstream_t& stream(void) {
            return m_stream;
        }
        
        void resolveLoggerFormatSpec(void) const {
            base::type::EnumType lIndex = LevelHelper::kMinValid;
            LevelHelper::forEachLevel(&lIndex, [&](void) -> bool {
                base::LogFormat* logFormat =
                const_cast<base::LogFormat*>(&m_typedConfigurations->logFormat(LevelHelper::castFromInt(lIndex)));
                base::utils::Str::replaceFirstWithEscape(logFormat->m_format, base::consts::kLoggerIdFormatSpecifier, m_id);
                return false;
            });
        }
    };
    namespace base {
        /// @brief Loggers repository
        class RegisteredLoggers : public base::utils::Registry<Logger, std::string> {
        public:
            explicit RegisteredLoggers(const LogBuilderPtr& defaultLogBuilder) :
            m_defaultLogBuilder(defaultLogBuilder) {
                m_defaultConfigurations.setToDefault();
            }
            
            virtual ~RegisteredLoggers(void) {
                unsafeFlushAll();
            }
            
            inline void setDefaultConfigurations(const Configurations& configurations) {
                base::threading::ScopedLock scopedLock(lock());
                m_defaultConfigurations.setFromBase(const_cast<Configurations*>(&configurations));
            }
            
            inline Configurations* defaultConfigurations(void) {
                return &m_defaultConfigurations;
            }
            
            Logger* get(const std::string& id, bool forceCreation = true) {
                base::threading::ScopedLock scopedLock(lock());
                Logger* logger_ = base::utils::Registry<Logger, std::string>::get(id);
                if (logger_ == nullptr && forceCreation) {
                    bool validId = Logger::isValidId(id);
                    if (!validId) {
                        ELPP_ASSERT(validId, "Invalid logger ID [" << id << "]. Not registering this logger.");
                        return nullptr;
                    }
                    logger_ = new Logger(id, m_defaultConfigurations, &m_logStreamsReference);
                    logger_->m_logBuilder = m_defaultLogBuilder;
                    registerNew(id, logger_);
                }
                return logger_;
            }
            
            bool remove(const std::string& id) {
                if (id == "default") {
                    return false;
                }
                Logger* logger = base::utils::Registry<Logger, std::string>::get(id);
                if (logger != nullptr) {
                    unregister(logger);
                }
                return true;
            }
            
            inline bool has(const std::string& id) {
                return get(id, false) != nullptr;
            }
            
            inline void unregister(Logger*& logger) {
                base::threading::ScopedLock scopedLock(lock());
                base::utils::Registry<Logger, std::string>::unregister(logger->id());
            }
            
            inline base::LogStreamsReferenceMap* logStreamsReference(void) {
                return &m_logStreamsReference;
            }
            
            inline void flushAll(void) {
                base::threading::ScopedLock scopedLock(lock());
                unsafeFlushAll();
            }
            
        private:
            LogBuilderPtr m_defaultLogBuilder;
            Configurations m_defaultConfigurations;
            base::LogStreamsReferenceMap m_logStreamsReference;
            friend class el::base::Storage;
            
            inline void unsafeFlushAll(void) {
                ELPP_INTERNAL_INFO(1, "Flushing all log files");
                for (base::LogStreamsReferenceMap::iterator it = m_logStreamsReference.begin();
                     it != m_logStreamsReference.end(); ++it) {
                    if (it->second.get() == nullptr) continue;
                    it->second->flush();
                }
            }
        };
        /// @brief Represents registries for verbose logging
        class VRegistry : base::NoCopy, public base::threading::ThreadSafe {
        public:
            explicit VRegistry(base::type::VerboseLevel level, base::type::EnumType* pFlags) : m_level(level), m_pFlags(pFlags) {
            }
            
            /// @brief Sets verbose level. Accepted range is 0-9
            inline void setLevel(base::type::VerboseLevel level) {
                base::threading::ScopedLock scopedLock(lock());
                if (level < 0)
                    m_level = 0;
                else if (level > 9)
                    m_level = base::consts::kMaxVerboseLevel;
                else
                    m_level = level;
            }
            
            inline base::type::VerboseLevel level(void) const {
                return m_level;
            }
            
            inline void clearModules(void) {
                base::threading::ScopedLock scopedLock(lock());
                m_modules.clear();
            }
            
            void setModules(const char* modules) {
                base::threading::ScopedLock scopedLock(lock());
                auto addSuffix = [](std::stringstream& ss, const char* sfx, const char* prev) {
                    if (prev != nullptr && base::utils::Str::endsWith(ss.str(), std::string(prev))) {
                        std::string chr(ss.str().substr(0, ss.str().size() - strlen(prev)));
                        ss.str(std::string(""));
                        ss << chr;
                    }
                    if (base::utils::Str::endsWith(ss.str(), std::string(sfx))) {
                        std::string chr(ss.str().substr(0, ss.str().size() - strlen(sfx)));
                        ss.str(std::string(""));
                        ss << chr;
                    }
                    ss << sfx;
                };
                auto insert = [&](std::stringstream& ss, base::type::VerboseLevel level) {
                    if (!base::utils::hasFlag(LoggingFlag::DisableVModulesExtensions, *m_pFlags)) {
                        addSuffix(ss, ".h", nullptr);
                        m_modules.insert(std::make_pair(ss.str(), level));
                        addSuffix(ss, ".c", ".h");
                        m_modules.insert(std::make_pair(ss.str(), level));
                        addSuffix(ss, ".cpp", ".c");
                        m_modules.insert(std::make_pair(ss.str(), level));
                        addSuffix(ss, ".cc", ".cpp");
                        m_modules.insert(std::make_pair(ss.str(), level));
                        addSuffix(ss, ".cxx", ".cc");
                        m_modules.insert(std::make_pair(ss.str(), level));
                        addSuffix(ss, ".-inl.h", ".cxx");
                        m_modules.insert(std::make_pair(ss.str(), level));
                        addSuffix(ss, ".hxx", ".-inl.h");
                        m_modules.insert(std::make_pair(ss.str(), level));
                        addSuffix(ss, ".hpp", ".hxx");
                        m_modules.insert(std::make_pair(ss.str(), level));
                        addSuffix(ss, ".hh", ".hpp");
                    }
                    m_modules.insert(std::make_pair(ss.str(), level));
                };
                bool isMod = true;
                bool isLevel = false;
                std::stringstream ss;
                int level = -1;
                for (; *modules; ++modules) {
                    switch (*modules) {
                        case '=':
                            isLevel = true;
                            isMod = false;
                            break;
                        case ',':
                            isLevel = false;
                            isMod = true;
                            if (!ss.str().empty() && level != -1) {
                                insert(ss, level);
                                ss.str(std::string(""));
                                level = -1;
                            }
                            break;
                        default:
                            if (isMod) {
                                ss << *modules;
                            } else if (isLevel) {
                                if (isdigit(*modules)) {
                                    level = static_cast<base::type::VerboseLevel>(*modules) - 48;
                                }
                            }
                            break;
                    }
                }
                if (!ss.str().empty() && level != -1) {
                    insert(ss, level);
                }
            }
            
            bool allowed(base::type::VerboseLevel vlevel, const char* file) {
                base::threading::ScopedLock scopedLock(lock());
                if (m_modules.empty() || file == nullptr) {
                    return vlevel <= m_level;
                } else {
                    std::map<std::string, base::type::VerboseLevel>::iterator it = m_modules.begin();
                    for (; it != m_modules.end(); ++it) {
                        if (base::utils::Str::wildCardMatch(file, it->first.c_str())) {
                            return vlevel <= it->second;
                        }
                    }
                    if (base::utils::hasFlag(LoggingFlag::AllowVerboseIfModuleNotSpecified, *m_pFlags)) {
                        return true;
                    }
                    return false;
                }
            }
            
            inline const std::map<std::string, base::type::VerboseLevel>& modules(void) const {
                return m_modules;
            }
            
            void setFromArgs(const base::utils::CommandLineArgs* commandLineArgs) {
                if (commandLineArgs->hasParam("-v") || commandLineArgs->hasParam("--verbose") ||
                    commandLineArgs->hasParam("-V") || commandLineArgs->hasParam("--VERBOSE")) {
                    setLevel(base::consts::kMaxVerboseLevel);
                } else if (commandLineArgs->hasParamWithValue("--v")) {
                    setLevel(atoi(commandLineArgs->getParamValue("--v")));
                } else if (commandLineArgs->hasParamWithValue("--V")) {
                    setLevel(atoi(commandLineArgs->getParamValue("--V")));
                } else if ((commandLineArgs->hasParamWithValue("-vmodule")) && vModulesEnabled()) {
                    setModules(commandLineArgs->getParamValue("-vmodule"));
                } else if (commandLineArgs->hasParamWithValue("-VMODULE") && vModulesEnabled()) {
                    setModules(commandLineArgs->getParamValue("-VMODULE"));
                }
            }
            
            /// @brief Whether or not vModules enabled
            inline bool vModulesEnabled(void) {
                return !base::utils::hasFlag(LoggingFlag::DisableVModules, *m_pFlags);
            }
            
        private:
            base::type::VerboseLevel m_level;
            base::type::EnumType* m_pFlags;
            std::map<std::string, base::type::VerboseLevel> m_modules;
        };
    }  // namespace base
    class LogMessage {
    public:
        LogMessage(Level level, const std::string& file, unsigned long int line, const std::string& func,
                   base::type::VerboseLevel verboseLevel, Logger* logger) :
        m_level(level), m_file(file), m_line(line), m_func(func),
        m_verboseLevel(verboseLevel), m_logger(logger), m_message(logger->stream().str()) {
        }
        inline Level level(void) const { return m_level; }
        inline const std::string& file(void) const { return m_file; }
        inline unsigned long int line(void) const { return m_line; } // NOLINT
        inline const std::string& func(void) const { return m_func; }
        inline base::type::VerboseLevel verboseLevel(void) const { return m_verboseLevel; }
        inline Logger* logger(void) const { return m_logger; }
        inline const base::type::string_t& message(void) const { return m_message; }
    private:
        Level m_level;
        std::string m_file;
        unsigned long int m_line;
        std::string m_func;
        base::type::VerboseLevel m_verboseLevel;
        Logger* m_logger;
        base::type::string_t m_message;
    };
    namespace base {
#if ELPP_ASYNC_LOGGING
        class AsyncLogItem {
        public:
            explicit AsyncLogItem(const LogMessage& logMessage, const LogDispatchData& data, const base::type::string_t& logLine)
            : m_logMessage(logMessage), m_dispatchData(data), m_logLine(logLine) {}
            virtual ~AsyncLogItem() {}
            inline LogMessage* logMessage(void) { return &m_logMessage; }
            inline LogDispatchData* data(void) { return &m_dispatchData; }
            inline base::type::string_t logLine(void) { return m_logLine; }
        private:
            LogMessage m_logMessage;
            LogDispatchData m_dispatchData;
            base::type::string_t m_logLine;
        };
        class AsyncLogQueue : public base::threading::ThreadSafe {
        public:
            virtual ~AsyncLogQueue() {
                ELPP_INTERNAL_INFO(6, "~AsyncLogQueue");
            }
            
            inline AsyncLogItem next(void) {
                base::threading::ScopedLock scopedLock(lock());
                AsyncLogItem result = m_queue.front();
                m_queue.pop();
                return result;
            }
            
            inline void push(const AsyncLogItem& item) {
                base::threading::ScopedLock scopedLock(lock());
                m_queue.push(item);
            }
            inline void pop(void) {
                base::threading::ScopedLock scopedLock(lock());
                m_queue.pop();
            }
            inline AsyncLogItem front(void) {
                base::threading::ScopedLock scopedLock(lock());
                return m_queue.front();
            }
            inline bool empty(void) {
                base::threading::ScopedLock scopedLock(lock());
                return m_queue.empty();
            }
        private:
            std::queue<AsyncLogItem> m_queue;
        };
        class IWorker {
        public:
            virtual ~IWorker() {}
            virtual void start() = 0;
        };
#endif // ELPP_ASYNC_LOGGING
        /// @brief Easylogging++ management storage
        class Storage : base::NoCopy, public base::threading::ThreadSafe {
        public:
#if ELPP_ASYNC_LOGGING
            Storage(const LogBuilderPtr& defaultLogBuilder, base::IWorker* asyncDispatchWorker) :
#else
            explicit Storage(const LogBuilderPtr& defaultLogBuilder) :
#endif  // ELPP_ASYNC_LOGGING
            m_registeredHitCounters(new base::RegisteredHitCounters()),
            m_registeredLoggers(new base::RegisteredLoggers(defaultLogBuilder)),
            m_flags(0x0),
            m_vRegistry(new base::VRegistry(0, &m_flags)),
#if ELPP_ASYNC_LOGGING
            m_asyncLogQueue(new base::AsyncLogQueue()),
            m_asyncDispatchWorker(asyncDispatchWorker),
#endif  // ELPP_ASYNC_LOGGING
            m_preRollOutCallback(base::defaultPreRollOutCallback) {
                // Register default logger
                m_registeredLoggers->get(std::string(base::consts::kDefaultLoggerId));
                // Register performance logger and reconfigure format
                Logger* performanceLogger = m_registeredLoggers->get(std::string(base::consts::kPerformanceLoggerId));
                performanceLogger->configurations()->setGlobally(ConfigurationType::Format, std::string("%datetime %level %msg"));
                performanceLogger->reconfigure();
#if defined(ELPP_SYSLOG)
                // Register syslog logger and reconfigure format
                Logger* sysLogLogger = m_registeredLoggers->get(std::string(base::consts::kSysLogLoggerId));
                sysLogLogger->configurations()->setGlobally(ConfigurationType::Format, std::string("%level: %msg"));
                sysLogLogger->reconfigure();
#endif //  defined(ELPP_SYSLOG)
                addFlag(LoggingFlag::AllowVerboseIfModuleNotSpecified);
#if ELPP_ASYNC_LOGGING
                installLogDispatchCallback<base::AsyncLogDispatchCallback>(std::string("AsyncLogDispatchCallback"));
#else
                installLogDispatchCallback<base::DefaultLogDispatchCallback>(std::string("DefaultLogDispatchCallback"));
#endif  // ELPP_ASYNC_LOGGING
                installPerformanceTrackingCallback<base::DefaultPerformanceTrackingCallback>(std::string("DefaultPerformanceTrackingCallback"));
                ELPP_INTERNAL_INFO(1, "Easylogging++ has been initialized");
#if ELPP_ASYNC_LOGGING
                m_asyncDispatchWorker->start();
#endif  // ELPP_ASYNC_LOGGING
            }
            
            virtual ~Storage(void) {
                ELPP_INTERNAL_INFO(4, "Destroying storage");
#if ELPP_ASYNC_LOGGING
                ELPP_INTERNAL_INFO(5, "Replacing log dispatch callback to synchronous");
                uninstallLogDispatchCallback<base::AsyncLogDispatchCallback>(std::string("AsyncLogDispatchCallback"));
                installLogDispatchCallback<base::DefaultLogDispatchCallback>(std::string("DefaultLogDispatchCallback"));
                ELPP_INTERNAL_INFO(5, "Destroying asyncDispatchWorker");
                base::utils::safeDelete(m_asyncDispatchWorker);
                ELPP_INTERNAL_INFO(5, "Destroying asyncLogQueue");
                base::utils::safeDelete(m_asyncLogQueue);
#endif  // ELPP_ASYNC_LOGGING
                ELPP_INTERNAL_INFO(5, "Destroying registeredHitCounters");
                base::utils::safeDelete(m_registeredHitCounters);
                ELPP_INTERNAL_INFO(5, "Destroying registeredLoggers");
                base::utils::safeDelete(m_registeredLoggers);
                ELPP_INTERNAL_INFO(5, "Destroying vRegistry");
                base::utils::safeDelete(m_vRegistry);
            }
            
            inline bool validateEveryNCounter(const char* filename, unsigned long int lineNumber, std::size_t occasion) {
                return hitCounters()->validateEveryN(filename, lineNumber, occasion);
            }
            
            inline bool validateAfterNCounter(const char* filename, unsigned long int lineNumber, std::size_t n) { // NOLINT
                return hitCounters()->validateAfterN(filename, lineNumber, n);
            }
            
            inline bool validateNTimesCounter(const char* filename, unsigned long int lineNumber, std::size_t n) { // NOLINT
                return hitCounters()->validateNTimes(filename, lineNumber, n);
            }
            
            inline base::RegisteredHitCounters* hitCounters(void) const {
                return m_registeredHitCounters;
            }
            
            inline base::RegisteredLoggers* registeredLoggers(void) const {
                return m_registeredLoggers;
            }
            
            inline base::VRegistry* vRegistry(void) const {
                return m_vRegistry;
            }
            
#if ELPP_ASYNC_LOGGING
            inline base::AsyncLogQueue* asyncLogQueue(void) const {
                return m_asyncLogQueue;
            }
#endif  // ELPP_ASYNC_LOGGING
            
            inline const base::utils::CommandLineArgs* commandLineArgs(void) const {
                return &m_commandLineArgs;
            }
            
            inline void addFlag(LoggingFlag flag) {
                base::utils::addFlag(flag, &m_flags);
            }
            
            inline void removeFlag(LoggingFlag flag) {
                base::utils::removeFlag(flag, &m_flags);
            }
            
            inline bool hasFlag(LoggingFlag flag) const {
                return base::utils::hasFlag(flag, m_flags);
            }
            
            inline base::type::EnumType flags(void) const {
                return m_flags;
            }
            
            inline void setFlags(base::type::EnumType flags) {
                m_flags = flags;
            }
            
            inline void setPreRollOutCallback(const PreRollOutCallback& callback) {
                m_preRollOutCallback = callback;
            }
            
            inline void unsetPreRollOutCallback(void) {
                m_preRollOutCallback = base::defaultPreRollOutCallback;
            }
            
            inline PreRollOutCallback& preRollOutCallback(void) {
                return m_preRollOutCallback;
            }
            
            inline bool hasCustomFormatSpecifier(const char* formatSpecifier) {
                base::threading::ScopedLock scopedLock(lock());
                return std::find(m_customFormatSpecifiers.begin(), m_customFormatSpecifiers.end(),
                                 formatSpecifier) != m_customFormatSpecifiers.end();
            }
            
            inline void installCustomFormatSpecifier(const CustomFormatSpecifier& customFormatSpecifier) {
                if (hasCustomFormatSpecifier(customFormatSpecifier.formatSpecifier())) {
                    return;
                }
                base::threading::ScopedLock scopedLock(lock());
                m_customFormatSpecifiers.push_back(customFormatSpecifier);
            }
            
            inline bool uninstallCustomFormatSpecifier(const char* formatSpecifier) {
                base::threading::ScopedLock scopedLock(lock());
                std::vector<CustomFormatSpecifier>::iterator it = std::find(m_customFormatSpecifiers.begin(),
                                                                            m_customFormatSpecifiers.end(), formatSpecifier);
                if (it != m_customFormatSpecifiers.end() && strcmp(formatSpecifier, it->formatSpecifier()) == 0) {
                    m_customFormatSpecifiers.erase(it);
                    return true;
                }
                return false;
            }
            
            const std::vector<CustomFormatSpecifier>* customFormatSpecifiers(void) const {
                return &m_customFormatSpecifiers;
            }
            
            inline void setLoggingLevel(Level level) {
                m_loggingLevel = level;
            }
            
            template <typename T>
            inline bool installLogDispatchCallback(const std::string& id) {
                return installCallback<T, base::type::LogDispatchCallbackPtr>(id, &m_logDispatchCallbacks);
            }
            
            template <typename T>
            inline void uninstallLogDispatchCallback(const std::string& id) {
                uninstallCallback<T, base::type::LogDispatchCallbackPtr>(id, &m_logDispatchCallbacks);
            }
            template <typename T>
            inline T* logDispatchCallback(const std::string& id) {
                return callback<T, base::type::LogDispatchCallbackPtr>(id, &m_logDispatchCallbacks);
            }
            
            template <typename T>
            inline bool installPerformanceTrackingCallback(const std::string& id) {
                return installCallback<T, base::type::PerformanceTrackingCallbackPtr>(id, &m_performanceTrackingCallbacks);
            }
            
            template <typename T>
            inline void uninstallPerformanceTrackingCallback(const std::string& id) {
                uninstallCallback<T, base::type::PerformanceTrackingCallbackPtr>(id, &m_performanceTrackingCallbacks);
            }
            
            template <typename T>
            inline T* performanceTrackingCallback(const std::string& id) {
                return callback<T, base::type::PerformanceTrackingCallbackPtr>(id, &m_performanceTrackingCallbacks);
            }
        private:
            base::RegisteredHitCounters* m_registeredHitCounters;
            base::RegisteredLoggers* m_registeredLoggers;
            base::type::EnumType m_flags;
            base::VRegistry* m_vRegistry;
#if ELPP_ASYNC_LOGGING
            base::AsyncLogQueue* m_asyncLogQueue;
            base::IWorker* m_asyncDispatchWorker;
#endif  // ELPP_ASYNC_LOGGING
            base::utils::CommandLineArgs m_commandLineArgs;
            PreRollOutCallback m_preRollOutCallback;
            std::map<std::string, base::type::LogDispatchCallbackPtr> m_logDispatchCallbacks;
            std::map<std::string, base::type::PerformanceTrackingCallbackPtr> m_performanceTrackingCallbacks;
            std::vector<CustomFormatSpecifier> m_customFormatSpecifiers;
            Level m_loggingLevel;
            
            friend class el::Helpers;
            friend class el::base::DefaultLogDispatchCallback;
            friend class el::LogBuilder;
            friend class el::base::MessageBuilder;
            friend class el::base::Writer;
            friend class el::base::PerformanceTracker;
            friend class el::base::LogDispatcher;
            
            void setApplicationArguments(int argc, char** argv) {
                m_commandLineArgs.setArgs(argc, argv);
                m_vRegistry->setFromArgs(commandLineArgs());
                // default log file
#if !defined(ELPP_DISABLE_LOG_FILE_FROM_ARG)
                if (m_commandLineArgs.hasParamWithValue(base::consts::kDefaultLogFileParam)) {
                    Configurations c;
                    c.setGlobally(ConfigurationType::Filename, std::string(m_commandLineArgs.getParamValue(base::consts::kDefaultLogFileParam)));
                    registeredLoggers()->setDefaultConfigurations(c);
                    for (base::RegisteredLoggers::iterator it = registeredLoggers()->begin();
                         it != registeredLoggers()->end(); ++it) {
                        it->second->configure(c);
                    }
                }
#endif  // !defined(ELPP_DISABLE_LOG_FILE_FROM_ARG)
#if defined(ELPP_LOGGING_FLAGS_FROM_ARG)
                if (m_commandLineArgs.hasParamWithValue(base::consts::kLoggingFlagsParam)) {
                    m_flags = atoi(m_commandLineArgs.getParamValue(base::consts::kLoggingFlagsParam));
                }
#endif  // defined(ELPP_LOGGING_FLAGS_FROM_ARG)
            }
            
            inline void setApplicationArguments(int argc, const char** argv) {
                setApplicationArguments(argc, const_cast<char**>(argv));
            }
            
            template <typename T, typename TPtr>
            inline bool installCallback(const std::string& id, std::map<std::string, TPtr>* mapT) {
                if (mapT->find(id) == mapT->end()) {
                    mapT->insert(std::make_pair(id, TPtr(new T())));
                    return true;
                }
                return false;
            }
            
            template <typename T, typename TPtr>
            inline void uninstallCallback(const std::string& id, std::map<std::string, TPtr>* mapT) {
                if (mapT->find(id) != mapT->end()) {
                    mapT->erase(id);
                }
            }
            
            template <typename T, typename TPtr>
            inline T* callback(const std::string& id, std::map<std::string, TPtr>* mapT) {
                typename std::map<std::string, TPtr>::iterator iter = mapT->find(id);
                if (iter != mapT->end()) {
                    return static_cast<T*>(iter->second.get());
                }
                return nullptr;
            }
        };
        extern ELPP_EXPORT base::type::StoragePointer elStorage;
#define ELPP el::base::elStorage
        class DefaultLogDispatchCallback : public LogDispatchCallback {
        protected:
            void handle(const LogDispatchData* data) {
                m_data = data;
                dispatch(m_data->logMessage()->logger()->logBuilder()->build(m_data->logMessage(),
                                                                             m_data->dispatchAction() == base::DispatchAction::NormalLog));
            }
        private:
            const LogDispatchData* m_data;
            void dispatch(base::type::string_t&& logLine) {
                if (m_data->dispatchAction() == base::DispatchAction::NormalLog) {
                    if (m_data->logMessage()->logger()->m_typedConfigurations->toFile(m_data->logMessage()->level())) {
                        base::type::fstream_t* fs = m_data->logMessage()->logger()->m_typedConfigurations->fileStream(m_data->logMessage()->level());
                        if (fs != nullptr) {
                            fs->write(logLine.c_str(), logLine.size());
                            if (fs->fail()) {
                                ELPP_INTERNAL_ERROR("Unable to write log to file ["
                                                    << m_data->logMessage()->logger()->m_typedConfigurations->filename(m_data->logMessage()->level()) << "].\n"
                                                    << "Few possible reasons (could be something else):\n" << "      * Permission denied\n"
                                                    << "      * Disk full\n" << "      * Disk is not writable", true);
                            } else {
                                if (ELPP->hasFlag(LoggingFlag::ImmediateFlush) || (m_data->logMessage()->logger()->isFlushNeeded(m_data->logMessage()->level()))) {
                                    m_data->logMessage()->logger()->flush(m_data->logMessage()->level(), fs);
                                }
                            }
                        } else {
                            ELPP_INTERNAL_ERROR("Log file for [" << LevelHelper::convertToString(m_data->logMessage()->level()) << "] "
                                                << "has not been configured but [TO_FILE] is configured to TRUE. [Logger ID: "
                                                << m_data->logMessage()->logger()->id() << "]", false);
                        }
                    }
                    if (m_data->logMessage()->logger()->m_typedConfigurations->toStandardOutput(m_data->logMessage()->level())) {
                        if (ELPP->hasFlag(LoggingFlag::ColoredTerminalOutput))
                            m_data->logMessage()->logger()->logBuilder()->convertToColoredOutput(&logLine, m_data->logMessage()->level());
                        ELPP_COUT << ELPP_COUT_LINE(logLine);
                    }
                }
#if defined(ELPP_SYSLOG)
                else if (m_data->dispatchAction() == base::DispatchAction::SysLog) {
                    // Determine syslog priority
                    int sysLogPriority = 0;
                    if (m_data->logMessage()->level() == Level::Fatal)
                        sysLogPriority = LOG_EMERG;
                    else if (m_data->logMessage()->level() == Level::Error)
                        sysLogPriority = LOG_ERR;
                    else if (m_data->logMessage()->level() == Level::Warning)
                        sysLogPriority = LOG_WARNING;
                    else if (m_data->logMessage()->level() == Level::Info)
                        sysLogPriority = LOG_INFO;
                    else if (m_data->logMessage()->level() == Level::Debug)
                        sysLogPriority = LOG_DEBUG;
                    else
                        sysLogPriority = LOG_NOTICE;
#   if defined(ELPP_UNICODE)
                    char* line = base::utils::Str::wcharPtrToCharPtr(logLine.c_str());
                    syslog(sysLogPriority, "%s", line);
                    free(line);
#   else
                    syslog(sysLogPriority, "%s", logLine.c_str());
#   endif
                }
#endif  // defined(ELPP_SYSLOG)
            }
        };
#if ELPP_ASYNC_LOGGING
        class AsyncLogDispatchCallback : public LogDispatchCallback {
        protected:
            void handle(const LogDispatchData* data) {
                base::type::string_t logLine = data->logMessage()->logger()->logBuilder()->build(data->logMessage(), data->dispatchAction() == base::DispatchAction::NormalLog);
                if (data->dispatchAction() == base::DispatchAction::NormalLog && data->logMessage()->logger()->typedConfigurations()->toStandardOutput(data->logMessage()->level())) {
                    if (ELPP->hasFlag(LoggingFlag::ColoredTerminalOutput))
                        data->logMessage()->logger()->logBuilder()->convertToColoredOutput(&logLine, data->logMessage()->level());
                    ELPP_COUT << ELPP_COUT_LINE(logLine);
                }
                // Save resources and only queue if we want to write to file otherwise just ignore handler
                if (data->logMessage()->logger()->typedConfigurations()->toFile(data->logMessage()->level())) {
                    ELPP->asyncLogQueue()->push(AsyncLogItem(*(data->logMessage()), *data, logLine));
                }
            }
        };
        class AsyncDispatchWorker : public base::IWorker, public base::threading::ThreadSafe {
        public:
            AsyncDispatchWorker() {
                setContinueRunning(false);
            }
            
            virtual ~AsyncDispatchWorker() {
                setContinueRunning(false);
                ELPP_INTERNAL_INFO(6, "Stopping dispatch worker - Cleaning log queue");
                clean();
                ELPP_INTERNAL_INFO(6, "Log queue cleaned");
            }
            
            inline bool clean(void) {
                std::mutex m;
                std::unique_lock<std::mutex> lk(m);
                cv.wait(lk, []{ return !ELPP->asyncLogQueue()->empty(); });
                emptyQueue();
                lk.unlock();
                cv.notify_one();
                return ELPP->asyncLogQueue()->empty();
            }
            
            inline void emptyQueue(void) {
                while (!ELPP->asyncLogQueue()->empty()) {
                    AsyncLogItem data = ELPP->asyncLogQueue()->next();
                    handle(&data);
                    base::threading::msleep(100);
                }
            }
            
            virtual inline void start(void) {
                base::threading::msleep(5000); // 5s (why?)
                setContinueRunning(true);
                std::thread t1(&AsyncDispatchWorker::run, this);
                t1.join();
            }
            
            void handle(AsyncLogItem* logItem) {
                LogDispatchData* data = logItem->data();
                LogMessage* logMessage = logItem->logMessage();
                Logger* logger = logMessage->logger();
                base::TypedConfigurations* conf = logger->typedConfigurations();
                base::type::string_t logLine = logItem->logLine();
                if (data->dispatchAction() == base::DispatchAction::NormalLog) {
                    if (conf->toFile(logMessage->level())) {
                        base::type::fstream_t* fs = conf->fileStream(logMessage->level());
                        if (fs != nullptr) {
                            fs->write(logLine.c_str(), logLine.size());
                            if (fs->fail()) {
                                ELPP_INTERNAL_ERROR("Unable to write log to file ["
                                                    << conf->filename(logMessage->level()) << "].\n"
                                                    << "Few possible reasons (could be something else):\n" << "      * Permission denied\n"
                                                    << "      * Disk full\n" << "      * Disk is not writable", true);
                            } else {
                                if (ELPP->hasFlag(LoggingFlag::ImmediateFlush) || (logger->isFlushNeeded(logMessage->level()))) {
                                    logger->flush(logMessage->level(), fs);
                                }
                            }
                        } else {
                            ELPP_INTERNAL_ERROR("Log file for [" << LevelHelper::convertToString(logMessage->level()) << "] "
                                                << "has not been configured but [TO_FILE] is configured to TRUE. [Logger ID: " << logger->id() << "]", false);
                        }
                    }
                }
#   if defined(ELPP_SYSLOG)
                else if (data->dispatchAction() == base::DispatchAction::SysLog) {
                    // Determine syslog priority
                    int sysLogPriority = 0;
                    if (logMessage->level() == Level::Fatal)
                        sysLogPriority = LOG_EMERG;
                    else if (logMessage->level() == Level::Error)
                        sysLogPriority = LOG_ERR;
                    else if (logMessage->level() == Level::Warning)
                        sysLogPriority = LOG_WARNING;
                    else if (logMessage->level() == Level::Info)
                        sysLogPriority = LOG_INFO;
                    else if (logMessage->level() == Level::Debug)
                        sysLogPriority = LOG_DEBUG;
                    else
                        sysLogPriority = LOG_NOTICE;
#      if defined(ELPP_UNICODE)
                    char* line = base::utils::Str::wcharPtrToCharPtr(logLine.c_str());
                    syslog(sysLogPriority, "%s", line);
                    free(line);
#      else
                    syslog(sysLogPriority, "%s", logLine.c_str());
#      endif
                }
#   endif  // defined(ELPP_SYSLOG)
            }
            
            void run(void) {
                while (continueRunning()) {
                    emptyQueue();
                    base::threading::msleep(10); // 10ms
                }
            }
            
            void setContinueRunning(bool value) {
                base::threading::ScopedLock scopedLock(m_continueRunningMutex);
                m_continueRunning = value;
            }
            
            bool continueRunning(void) const {
                return m_continueRunning;
            }
        private:
            std::condition_variable cv;
            bool m_continueRunning;
            base::threading::Mutex m_continueRunningMutex;
        };
#endif  // ELPP_ASYNC_LOGGING
    }  // namespace base
    namespace base {
        class DefaultLogBuilder : public LogBuilder {
        public:
            base::type::string_t build(const LogMessage* logMessage, bool appendNewLine) const {
                base::TypedConfigurations* tc = logMessage->logger()->typedConfigurations();
                const base::LogFormat* logFormat = &tc->logFormat(logMessage->level());
                base::type::string_t logLine = logFormat->format();
                char buff[base::consts::kSourceFilenameMaxLength + base::consts::kSourceLineMaxLength] = "";
                const char* bufLim = buff + sizeof(buff);
                if (logFormat->hasFlag(base::FormatFlags::AppName)) {
                    // App name
                    base::utils::Str::replaceFirstWithEscape(logLine, base::consts::kAppNameFormatSpecifier,
                                                             logMessage->logger()->parentApplicationName());
                }
                if (logFormat->hasFlag(base::FormatFlags::ThreadId)) {
                    // Thread ID
                    base::utils::Str::replaceFirstWithEscape(logLine, base::consts::kThreadIdFormatSpecifier,
                                                             base::threading::getCurrentThreadId());
                }
                if (logFormat->hasFlag(base::FormatFlags::DateTime)) {
                    // DateTime
                    base::utils::Str::replaceFirstWithEscape(logLine, base::consts::kDateTimeFormatSpecifier,
                                                             base::utils::DateTime::getDateTime(logFormat->dateTimeFormat().c_str(),
                                                                                                &tc->millisecondsWidth(logMessage->level())));
                }
                if (logFormat->hasFlag(base::FormatFlags::Function)) {
                    // Function
                    base::utils::Str::replaceFirstWithEscape(logLine, base::consts::kLogFunctionFormatSpecifier, logMessage->func());
                }
                if (logFormat->hasFlag(base::FormatFlags::File)) {
                    // File
                    base::utils::Str::clearBuff(buff, base::consts::kSourceFilenameMaxLength);
                    base::utils::File::buildStrippedFilename(logMessage->file().c_str(), buff);
                    base::utils::Str::replaceFirstWithEscape(logLine, base::consts::kLogFileFormatSpecifier, std::string(buff));
                }
                if (logFormat->hasFlag(base::FormatFlags::FileBase)) {
                    // FileBase
                    base::utils::Str::clearBuff(buff, base::consts::kSourceFilenameMaxLength);
                    base::utils::File::buildBaseFilename(logMessage->file(), buff);
                    base::utils::Str::replaceFirstWithEscape(logLine, base::consts::kLogFileBaseFormatSpecifier, std::string(buff));
                }
                if (logFormat->hasFlag(base::FormatFlags::Line)) {
                    // Line
                    char* buf = base::utils::Str::clearBuff(buff, base::consts::kSourceLineMaxLength);
                    buf = base::utils::Str::convertAndAddToBuff(logMessage->line(), base::consts::kSourceLineMaxLength, buf, bufLim, false);
                    base::utils::Str::replaceFirstWithEscape(logLine, base::consts::kLogLineFormatSpecifier, std::string(buff));
                }
                if (logFormat->hasFlag(base::FormatFlags::Location)) {
                    // Location
                    char* buf = base::utils::Str::clearBuff(buff, base::consts::kSourceFilenameMaxLength + base::consts::kSourceLineMaxLength);
                    base::utils::File::buildStrippedFilename(logMessage->file().c_str(), buff);
                    buf = base::utils::Str::addToBuff(buff, buf, bufLim);
                    buf = base::utils::Str::addToBuff(":", buf, bufLim);
                    buf = base::utils::Str::convertAndAddToBuff(logMessage->line(),  base::consts::kSourceLineMaxLength, buf, bufLim, false);
                    base::utils::Str::replaceFirstWithEscape(logLine, base::consts::kLogLocationFormatSpecifier, std::string(buff));
                }
                if (logMessage->level() == Level::Verbose && logFormat->hasFlag(base::FormatFlags::VerboseLevel)) {
                    // Verbose level
                    char* buf = base::utils::Str::clearBuff(buff, 1);
                    buf = base::utils::Str::convertAndAddToBuff(logMessage->verboseLevel(), 1, buf, bufLim, false);
                    base::utils::Str::replaceFirstWithEscape(logLine, base::consts::kVerboseLevelFormatSpecifier, std::string(buff));
                }
                if (logFormat->hasFlag(base::FormatFlags::LogMessage)) {
                    // Log message
                    base::utils::Str::replaceFirstWithEscape(logLine, base::consts::kMessageFormatSpecifier, logMessage->message());
                }
#if !defined(ELPP_DISABLE_CUSTOM_FORMAT_SPECIFIERS)
                for (std::vector<CustomFormatSpecifier>::const_iterator it = ELPP->customFormatSpecifiers()->begin();
                     it != ELPP->customFormatSpecifiers()->end(); ++it) {
                    std::string fs(it->formatSpecifier());
                    base::type::string_t wcsFormatSpecifier(fs.begin(), fs.end());
                    base::utils::Str::replaceFirstWithEscape(logLine, wcsFormatSpecifier, std::string(it->resolver()()));
                }
#endif  // !defined(ELPP_DISABLE_CUSTOM_FORMAT_SPECIFIERS)
                if (appendNewLine) logLine += ELPP_LITERAL("\n");
                return logLine;
            }
        };
        /// @brief Dispatches log messages
        class LogDispatcher : base::NoCopy {
        public:
            LogDispatcher(bool proceed, LogMessage&& logMessage, base::DispatchAction dispatchAction) :
            m_proceed(proceed),
            m_logMessage(std::move(logMessage)),
            m_dispatchAction(std::move(dispatchAction)) {
            }
            
            void dispatch(void) {
                if (m_proceed && m_dispatchAction == base::DispatchAction::None) {
                    m_proceed = false;
                }
                if (!m_proceed) {
                    return;
                }
                // We minimize the time of ELPP's lock - this lock is released after log is written
                base::threading::ScopedLock scopedLock(ELPP->lock());
                base::TypedConfigurations* tc = m_logMessage.logger()->m_typedConfigurations;
                if (ELPP->hasFlag(LoggingFlag::StrictLogFileSizeCheck)) {
                    tc->validateFileRolling(m_logMessage.level(), ELPP->preRollOutCallback());
                }
                LogDispatchCallback* callback = nullptr;
                LogDispatchData data;
                for (const std::pair<std::string, base::type::LogDispatchCallbackPtr>& h
                     : ELPP->m_logDispatchCallbacks) {
                    callback = h.second.get();
                    if (callback != nullptr && callback->enabled()) {
                        data.setLogMessage(&m_logMessage);
                        data.setDispatchAction(m_dispatchAction);
                        callback->acquireLock();
                        callback->handle(&data);
                        callback->releaseLock();
                    }
                }
            }
            
        private:
            bool m_proceed;
            LogMessage m_logMessage;
            base::DispatchAction m_dispatchAction;
        };
#if defined(ELPP_STL_LOGGING)
        /// @brief Workarounds to write some STL logs
        ///
        /// @detail There is workaround needed to loop through some stl containers. In order to do that, we need iterable containers
        /// of same type and provide iterator interface and pass it on to writeIterator().
        /// Remember, this is passed by value in constructor so that we dont change original containers.
        /// This operation is as expensive as Big-O(std::min(class_.size(), base::consts::kMaxLogPerContainer))
        namespace workarounds {
            /// @brief Abstract IterableContainer template that provides interface for iterable classes of type T
            template <typename T, typename Container>
            class IterableContainer {
            public:
                typedef typename Container::iterator iterator;
                typedef typename Container::const_iterator const_iterator;
                IterableContainer(void) {}
                virtual ~IterableContainer(void) {}
                iterator begin(void) { return getContainer().begin(); }
                iterator end(void) { return getContainer().end(); }
            private:
                virtual Container& getContainer(void) = 0;
            };
            /// @brief Implements IterableContainer and provides iterable std::priority_queue class
            template<typename T, typename Container = std::vector<T>, typename Comparator = std::less<typename Container::value_type>>
            class IterablePriorityQueue : public IterableContainer<T, Container>, public std::priority_queue<T, Container, Comparator> {
            public:
                IterablePriorityQueue(std::priority_queue<T, Container, Comparator> queue_) {
                    std::size_t count_ = 0;
                    while (++count_ < base::consts::kMaxLogPerContainer && !queue_.empty()) {
                        this->push(queue_.top());
                        queue_.pop();
                    }
                }
            private:
                inline Container& getContainer(void) {
                    return this->c;
                }
            };
            /// @brief Implements IterableContainer and provides iterable std::queue class
            template<typename T, typename Container = std::deque<T>>
            class IterableQueue : public IterableContainer<T, Container>, public std::queue<T, Container> {
            public:
                IterableQueue(std::queue<T, Container> queue_) {
                    std::size_t count_ = 0;
                    while (++count_ < base::consts::kMaxLogPerContainer && !queue_.empty()) {
                        this->push(queue_.front());
                        queue_.pop();
                    }
                }
            private:
                inline Container& getContainer(void) {
                    return this->c;
                }
            };
            /// @brief Implements IterableContainer and provides iterable std::stack class
            template<typename T, typename Container = std::deque<T>>
            class IterableStack : public IterableContainer<T, Container>, public std::stack<T, Container> {
            public:
                IterableStack(std::stack<T, Container> stack_) {
                    std::size_t count_ = 0;
                    while (++count_ < base::consts::kMaxLogPerContainer && !stack_.empty()) {
                        this->push(stack_.top());
                        stack_.pop();
                    }
                }
            private:
                inline Container& getContainer(void) {
                    return this->c;
                }
            };
        }  // namespace workarounds
#endif  // defined(ELPP_STL_LOGGING)
        // Log message builder
        class MessageBuilder {
        public:
            MessageBuilder(void) : m_logger(nullptr), m_containerLogSeperator(ELPP_LITERAL("")) {}
            void initialize(Logger* logger) {
                m_logger = logger;
                m_containerLogSeperator = ELPP->hasFlag(LoggingFlag::NewLineForContainer) ?
                ELPP_LITERAL("\n    ") : ELPP_LITERAL(", ");
            }
            
#   define ELPP_SIMPLE_LOG(LOG_TYPE)\
inline MessageBuilder& operator<<(LOG_TYPE msg) {\
m_logger->stream() << msg;\
if (ELPP->hasFlag(LoggingFlag::AutoSpacing)) {\
m_logger->stream() << " ";\
}\
return *this;\
}
            
            inline MessageBuilder& operator<<(const std::string& msg) {
                return operator<<(msg.c_str());
            }
            ELPP_SIMPLE_LOG(char)
            ELPP_SIMPLE_LOG(bool)
            ELPP_SIMPLE_LOG(signed short)
            ELPP_SIMPLE_LOG(unsigned short)
            ELPP_SIMPLE_LOG(signed int)
            ELPP_SIMPLE_LOG(unsigned int)
            ELPP_SIMPLE_LOG(signed long)
            ELPP_SIMPLE_LOG(unsigned long)
            ELPP_SIMPLE_LOG(float)
            ELPP_SIMPLE_LOG(double)
            ELPP_SIMPLE_LOG(char*)
            ELPP_SIMPLE_LOG(const char*)
            ELPP_SIMPLE_LOG(const void*)
            ELPP_SIMPLE_LOG(long double)
            inline MessageBuilder& operator<<(const std::wstring& msg) {
                return operator<<(msg.c_str());
            }
            inline MessageBuilder& operator<<(const wchar_t* msg) {
                if (msg == nullptr) {
                    m_logger->stream() << base::consts::kNullPointer;
                    return *this;
                }
#   if defined(ELPP_UNICODE)
                m_logger->stream() << msg;
#   else
                char* buff_ = base::utils::Str::wcharPtrToCharPtr(msg);
                m_logger->stream() << buff_;
                free(buff_);
#   endif
                if (ELPP->hasFlag(LoggingFlag::AutoSpacing)) {
                    m_logger->stream() << " ";
                }
                return *this;
            }
            // ostream manipulators
            inline MessageBuilder& operator<<(std::ostream& (*OStreamMani)(std::ostream&)) {
                m_logger->stream() << OStreamMani;
                return *this;
            }
#define ELPP_ITERATOR_CONTAINER_LOG_ONE_ARG(temp)                                                    \
template <typename T>                                                                            \
inline MessageBuilder& operator<<(const temp<T>& template_inst) {                                \
return writeIterator(template_inst.begin(), template_inst.end(), template_inst.size());      \
}
#define ELPP_ITERATOR_CONTAINER_LOG_TWO_ARG(temp)                                                    \
template <typename T1, typename T2>                                                              \
inline MessageBuilder& operator<<(const temp<T1, T2>& template_inst) {                           \
return writeIterator(template_inst.begin(), template_inst.end(), template_inst.size());      \
}
#define ELPP_ITERATOR_CONTAINER_LOG_THREE_ARG(temp)                                                  \
template <typename T1, typename T2, typename T3>                                                 \
inline MessageBuilder& operator<<(const temp<T1, T2, T3>& template_inst) {                       \
return writeIterator(template_inst.begin(), template_inst.end(), template_inst.size());      \
}
#define ELPP_ITERATOR_CONTAINER_LOG_FOUR_ARG(temp)                                                   \
template <typename T1, typename T2, typename T3, typename T4>                                    \
inline MessageBuilder& operator<<(const temp<T1, T2, T3, T4>& template_inst) {                   \
return writeIterator(template_inst.begin(), template_inst.end(), template_inst.size());      \
}
#define ELPP_ITERATOR_CONTAINER_LOG_FIVE_ARG(temp)                                                   \
template <typename T1, typename T2, typename T3, typename T4, typename T5>                       \
inline MessageBuilder& operator<<(const temp<T1, T2, T3, T4, T5>& template_inst) {               \
return writeIterator(template_inst.begin(), template_inst.end(), template_inst.size());      \
}
            
#if defined(ELPP_STL_LOGGING)
            ELPP_ITERATOR_CONTAINER_LOG_TWO_ARG(std::vector)
            ELPP_ITERATOR_CONTAINER_LOG_TWO_ARG(std::list)
            ELPP_ITERATOR_CONTAINER_LOG_TWO_ARG(std::deque)
            ELPP_ITERATOR_CONTAINER_LOG_THREE_ARG(std::set)
            ELPP_ITERATOR_CONTAINER_LOG_THREE_ARG(std::multiset)
            ELPP_ITERATOR_CONTAINER_LOG_FOUR_ARG(std::map)
            ELPP_ITERATOR_CONTAINER_LOG_FOUR_ARG(std::multimap)
            template <class T, class Container>
            inline MessageBuilder& operator<<(const std::queue<T, Container>& queue_) {
                base::workarounds::IterableQueue<T, Container> iterableQueue_ =
                static_cast<base::workarounds::IterableQueue<T, Container> >(queue_);
                return writeIterator(iterableQueue_.begin(), iterableQueue_.end(), iterableQueue_.size());
            }
            template <class T, class Container>
            inline MessageBuilder& operator<<(const std::stack<T, Container>& stack_) {
                base::workarounds::IterableStack<T, Container> iterableStack_ =
                static_cast<base::workarounds::IterableStack<T, Container> >(stack_);
                return writeIterator(iterableStack_.begin(), iterableStack_.end(), iterableStack_.size());
            }
            template <class T, class Container, class Comparator>
            inline MessageBuilder& operator<<(const std::priority_queue<T, Container, Comparator>& priorityQueue_) {
                base::workarounds::IterablePriorityQueue<T, Container, Comparator> iterablePriorityQueue_ =
                static_cast<base::workarounds::IterablePriorityQueue<T, Container, Comparator> >(priorityQueue_);
                return writeIterator(iterablePriorityQueue_.begin(), iterablePriorityQueue_.end(), iterablePriorityQueue_.size());
            }
            template <class First, class Second>
            inline MessageBuilder& operator<<(const std::pair<First, Second>& pair_) {
                m_logger->stream() << ELPP_LITERAL("(");
                operator << (static_cast<First>(pair_.first));
                m_logger->stream() << ELPP_LITERAL(", ");
                operator << (static_cast<Second>(pair_.second));
                m_logger->stream() << ELPP_LITERAL(")");
                return *this;
            }
            template <std::size_t Size>
            inline MessageBuilder& operator<<(const std::bitset<Size>& bitset_) {
                m_logger->stream() << ELPP_LITERAL("[");
                operator << (bitset_.to_string());
                m_logger->stream() << ELPP_LITERAL("]");
                return *this;
            }
#   if defined(ELPP_LOG_STD_ARRAY)
            template <class T, std::size_t Size>
            inline MessageBuilder& operator<<(const std::array<T, Size>& array) {
                return writeIterator(array.begin(), array.end(), array.size());
            }
#   endif  // defined(ELPP_LOG_STD_ARRAY)
#   if defined(ELPP_LOG_UNORDERED_MAP)
            ELPP_ITERATOR_CONTAINER_LOG_FIVE_ARG(std::unordered_map)
            ELPP_ITERATOR_CONTAINER_LOG_FIVE_ARG(std::unordered_multimap)
#   endif  // defined(ELPP_LOG_UNORDERED_MAP)
#   if defined(ELPP_LOG_UNORDERED_SET)
            ELPP_ITERATOR_CONTAINER_LOG_FOUR_ARG(std::unordered_set)
            ELPP_ITERATOR_CONTAINER_LOG_FOUR_ARG(std::unordered_multiset)
#   endif  // defined(ELPP_LOG_UNORDERED_SET)
#endif  // defined(ELPP_STL_LOGGING)
#if defined(ELPP_QT_LOGGING)
            inline MessageBuilder& operator<<(const QString& msg) {
#   if defined(ELPP_UNICODE)
                m_logger->stream() << msg.toStdWString();
#   else
                m_logger->stream() << msg.toStdString();
#   endif  // defined(ELPP_UNICODE)
                return *this;
            }
            inline MessageBuilder& operator<<(const QByteArray& msg) {
                return operator << (QString(msg));
            }
            inline MessageBuilder& operator<<(const QStringRef& msg) {
                return operator<<(msg.toString());
            }
            inline MessageBuilder& operator<<(qint64 msg) {
#   if defined(ELPP_UNICODE)
                m_logger->stream() << QString::number(msg).toStdWString();
#   else
                m_logger->stream() << QString::number(msg).toStdString();
#   endif  // defined(ELPP_UNICODE)
                return *this;
            }
            inline MessageBuilder& operator<<(quint64 msg) {
#   if defined(ELPP_UNICODE)
                m_logger->stream() << QString::number(msg).toStdWString();
#   else
                m_logger->stream() << QString::number(msg).toStdString();
#   endif  // defined(ELPP_UNICODE)
                return *this;
            }
            inline MessageBuilder& operator<<(QChar msg) {
                m_logger->stream() << msg.toLatin1();
                return *this;
            }
            inline MessageBuilder& operator<<(const QLatin1String& msg) {
                m_logger->stream() << msg.latin1();
                return *this;
            }
            ELPP_ITERATOR_CONTAINER_LOG_ONE_ARG(QList)
            ELPP_ITERATOR_CONTAINER_LOG_ONE_ARG(QVector)
            ELPP_ITERATOR_CONTAINER_LOG_ONE_ARG(QQueue)
            ELPP_ITERATOR_CONTAINER_LOG_ONE_ARG(QSet)
            ELPP_ITERATOR_CONTAINER_LOG_ONE_ARG(QLinkedList)
            ELPP_ITERATOR_CONTAINER_LOG_ONE_ARG(QStack)
            template <typename First, typename Second>
            inline MessageBuilder& operator<<(const QPair<First, Second>& pair_) {
                m_logger->stream() << ELPP_LITERAL("(");
                operator << (static_cast<First>(pair_.first));
                m_logger->stream() << ELPP_LITERAL(", ");
                operator << (static_cast<Second>(pair_.second));
                m_logger->stream() << ELPP_LITERAL(")");
                return *this;
            }
            template <typename K, typename V>
            inline MessageBuilder& operator<<(const QMap<K, V>& map_) {
                m_logger->stream() << ELPP_LITERAL("[");
                QList<K> keys = map_.keys();
                typename QList<K>::const_iterator begin = keys.begin();
                typename QList<K>::const_iterator end = keys.end();
                int max_ = static_cast<int>(base::consts::kMaxLogPerContainer);  // to prevent warning
                for (int index_ = 0; begin != end && index_ < max_; ++index_, ++begin) {
                    m_logger->stream() << ELPP_LITERAL("(");
                    operator << (static_cast<K>(*begin));
                    m_logger->stream() << ELPP_LITERAL(", ");
                    operator << (static_cast<V>(map_.value(*begin)));
                    m_logger->stream() << ELPP_LITERAL(")");
                    m_logger->stream() << ((index_ < keys.size() -1) ? m_containerLogSeperator : ELPP_LITERAL(""));
                }
                if (begin != end) {
                    m_logger->stream() << ELPP_LITERAL("...");
                }
                m_logger->stream() << ELPP_LITERAL("]");
                return *this;
            }
            template <typename K, typename V>
            inline MessageBuilder& operator<<(const QMultiMap<K, V>& map_) {
                operator << (static_cast<QMap<K, V>>(map_));
                return *this;
            }
            template <typename K, typename V>
            inline MessageBuilder& operator<<(const QHash<K, V>& hash_) {
                m_logger->stream() << ELPP_LITERAL("[");
                QList<K> keys = hash_.keys();
                typename QList<K>::const_iterator begin = keys.begin();
                typename QList<K>::const_iterator end = keys.end();
                int max_ = static_cast<int>(base::consts::kMaxLogPerContainer);  // prevent type warning
                for (int index_ = 0; begin != end && index_ < max_; ++index_, ++begin) {
                    m_logger->stream() << ELPP_LITERAL("(");
                    operator << (static_cast<K>(*begin));
                    m_logger->stream() << ELPP_LITERAL(", ");
                    operator << (static_cast<V>(hash_.value(*begin)));
                    m_logger->stream() << ELPP_LITERAL(")");
                    m_logger->stream() << ((index_ < keys.size() -1) ? m_containerLogSeperator : ELPP_LITERAL(""));
                }
                if (begin != end) {
                    m_logger->stream() << ELPP_LITERAL("...");
                }
                m_logger->stream() << ELPP_LITERAL("]");
                return *this;
            }
            template <typename K, typename V>
            inline MessageBuilder& operator<<(const QMultiHash<K, V>& multiHash_) {
                operator << (static_cast<QHash<K, V>>(multiHash_));
                return *this;
            }
#endif  // defined(ELPP_QT_LOGGING)
#if defined(ELPP_BOOST_LOGGING)
            ELPP_ITERATOR_CONTAINER_LOG_TWO_ARG(boost::container::vector)
            ELPP_ITERATOR_CONTAINER_LOG_TWO_ARG(boost::container::stable_vector)
            ELPP_ITERATOR_CONTAINER_LOG_TWO_ARG(boost::container::list)
            ELPP_ITERATOR_CONTAINER_LOG_TWO_ARG(boost::container::deque)
            ELPP_ITERATOR_CONTAINER_LOG_FOUR_ARG(boost::container::map)
            ELPP_ITERATOR_CONTAINER_LOG_FOUR_ARG(boost::container::flat_map)
            ELPP_ITERATOR_CONTAINER_LOG_THREE_ARG(boost::container::set)
            ELPP_ITERATOR_CONTAINER_LOG_THREE_ARG(boost::container::flat_set)
#endif  // defined(ELPP_BOOST_LOGGING)
            
            /// @brief Macro used internally that can be used externally to make containers easylogging++ friendly
            ///
            /// @detail This macro expands to write an ostream& operator<< for container. This container is expected to
            ///         have begin() and end() methods that return respective iterators
            /// @param ContainerType Type of container e.g, MyList from WX_DECLARE_LIST(int, MyList); in wxwidgets
            /// @param SizeMethod Method used to get size of container.
            /// @param ElementInstance Instance of element to be fed out. Insance name is "elem". See WXELPP_ENABLED macro
            ///        for an example usage
#define MAKE_CONTAINERELPP_FRIENDLY(ContainerType, SizeMethod, ElementInstance) \
el::base::type::ostream_t& operator<<(el::base::type::ostream_t& ss, const ContainerType& container) {\
const el::base::type::char_t* sep = ELPP->hasFlag(el::LoggingFlag::NewLineForContainer) ? \
ELPP_LITERAL("\n    ") : ELPP_LITERAL(", ");\
ContainerType::const_iterator elem = container.begin();\
ContainerType::const_iterator endElem = container.end();\
std::size_t size_ = container.SizeMethod; \
ss << ELPP_LITERAL("[");\
for (std::size_t i = 0; elem != endElem && i < el::base::consts::kMaxLogPerContainer; ++i, ++elem) { \
ss << ElementInstance;\
ss << ((i < size_ - 1) ? sep : ELPP_LITERAL(""));\
}\
if (elem != endElem) {\
ss << ELPP_LITERAL("...");\
}\
ss << ELPP_LITERAL("]");\
return ss;\
}
#if defined(ELPP_WXWIDGETS_LOGGING)
            ELPP_ITERATOR_CONTAINER_LOG_ONE_ARG(wxVector)
#   define ELPP_WX_PTR_ENABLED(ContainerType) MAKE_CONTAINERELPP_FRIENDLY(ContainerType, size(), *(*elem))
#   define ELPP_WX_ENABLED(ContainerType) MAKE_CONTAINERELPP_FRIENDLY(ContainerType, size(), (*elem))
#   define ELPP_WX_HASH_MAP_ENABLED(ContainerType) MAKE_CONTAINERELPP_FRIENDLY(ContainerType, size(), \
ELPP_LITERAL("(") << elem->first << ELPP_LITERAL(", ") << elem->second << ELPP_LITERAL(")")
#else
#   define ELPP_WX_PTR_ENABLED(ContainerType)
#   define ELPP_WX_ENABLED(ContainerType)
#   define ELPP_WX_HASH_MAP_ENABLED(ContainerType)
#endif  // defined(ELPP_WXWIDGETS_LOGGING)
            // Other classes
            template <class Class>
            ELPP_SIMPLE_LOG(const Class&)
#undef ELPP_SIMPLE_LOG
#undef ELPP_ITERATOR_CONTAINER_LOG_ONE_ARG
#undef ELPP_ITERATOR_CONTAINER_LOG_TWO_ARG
#undef ELPP_ITERATOR_CONTAINER_LOG_THREE_ARG
#undef ELPP_ITERATOR_CONTAINER_LOG_FOUR_ARG
#undef ELPP_ITERATOR_CONTAINER_LOG_FIVE_ARG
        private:
            Logger* m_logger;
            const base::type::char_t* m_containerLogSeperator;
            
            template<class Iterator>
            inline MessageBuilder& writeIterator(Iterator begin_, Iterator end_, std::size_t size_) {
                m_logger->stream() << ELPP_LITERAL("[");
                for (std::size_t i = 0; begin_ != end_ && i < base::consts::kMaxLogPerContainer; ++i, ++begin_) {
                    operator << (*begin_);
                    m_logger->stream() << ((i < size_ - 1) ? m_containerLogSeperator : ELPP_LITERAL(""));
                }
                if (begin_ != end_) {
                    m_logger->stream() << ELPP_LITERAL("...");
                }
                m_logger->stream() << ELPP_LITERAL("]");
                if (ELPP->hasFlag(LoggingFlag::AutoSpacing)) {
                    m_logger->stream() << " ";
                }
                return *this;
            }
        };
        /// @brief Writes nothing - Used when certain log is disabled
        class NullWriter : base::NoCopy {
        public:
            NullWriter(void) {}
            
            // Null manipulator
            inline NullWriter& operator<<(std::ostream& (*)(std::ostream&)) {
                return *this;
            }
            
            template <typename T>
            inline NullWriter& operator<<(const T&) {
                return *this;
            }
        };
        /// @brief Main entry point of each logging
        class Writer : base::NoCopy {
        public:
            Writer(Level level, const char* file, unsigned long int line,
                   const char* func, base::DispatchAction dispatchAction = base::DispatchAction::NormalLog,
                   base::type::VerboseLevel verboseLevel = 0) :
            m_level(level), m_file(file), m_line(line), m_func(func), m_verboseLevel(verboseLevel),
            m_proceed(false), m_dispatchAction(dispatchAction) {
            }
            
            virtual ~Writer(void) {
                processDispatch();
            }
            
            template <typename T>
            inline Writer& operator<<(const T& log) {
#if ELPP_LOGGING_ENABLED
                if (m_proceed) {
                    m_messageBuilder << log;
                }
#endif  // ELPP_LOGGING_ENABLED
                return *this;
            }
            
            inline Writer& operator<<(std::ostream& (*log)(std::ostream&)) {
#if ELPP_LOGGING_ENABLED
                if (m_proceed) {
                    m_messageBuilder << log;
                }
#endif  // ELPP_LOGGING_ENABLED
                return *this;
            }
            
            Writer& construct(Logger* logger, bool needLock = true) {
                m_logger = logger;
                initializeLogger(logger->id(), false, needLock);
                m_messageBuilder.initialize(m_logger);
                return *this;
            }
            
            Writer& construct(int count, const char* loggerIds, ...) {
                if (ELPP->hasFlag(LoggingFlag::MultiLoggerSupport)) {
                    va_list loggersList;
                    va_start(loggersList, loggerIds);
                    const char* id = loggerIds;
                    for (int i = 0; i < count; ++i) {
                        m_loggerIds.push_back(std::string(id));
                        id = va_arg(loggersList, const char*);
                    }
                    va_end(loggersList);
                    initializeLogger(m_loggerIds.at(0));
                } else {
                    initializeLogger(std::string(loggerIds));
                }
                m_messageBuilder.initialize(m_logger);
                return *this;
            }
        protected:
            Level m_level;
            const char* m_file;
            const unsigned long int m_line;
            const char* m_func;
            base::type::VerboseLevel m_verboseLevel;
            Logger* m_logger;
            bool m_proceed;
            base::MessageBuilder m_messageBuilder;
            base::DispatchAction m_dispatchAction;
            std::vector<std::string> m_loggerIds;
            friend class el::Helpers;
            
            void initializeLogger(const std::string& loggerId, bool lookup = true, bool needLock = true) {
                if (lookup) {
                    m_logger = ELPP->registeredLoggers()->get(loggerId, ELPP->hasFlag(LoggingFlag::CreateLoggerAutomatically));
                }
                if (m_logger == nullptr) {
                    ELPP->acquireLock();
                    if (!ELPP->registeredLoggers()->has(std::string(base::consts::kDefaultLoggerId))) {
                        // Somehow default logger has been unregistered. Not good! Register again
                        ELPP->registeredLoggers()->get(std::string(base::consts::kDefaultLoggerId));
                    }
                    ELPP->releaseLock();  // Need to unlock it for next writer
                    Writer(Level::Debug, m_file, m_line, m_func).construct(1, base::consts::kDefaultLoggerId)
                    << "Logger [" << loggerId << "] is not registered yet!";
                    m_proceed = false;
                } else {
                    if (needLock) {
                        m_logger->acquireLock();  // This should not be unlocked by checking m_proceed because
                        // m_proceed can be changed by lines below
                    }
                    if (ELPP->hasFlag(LoggingFlag::HierarchicalLogging)) {
                        m_proceed = m_level == Level::Verbose ? m_logger->enabled(m_level) :
                        LevelHelper::castToInt(m_level) >= LevelHelper::castToInt(ELPP->m_loggingLevel);
                    } else {
                        m_proceed = m_logger->enabled(m_level);
                    }
                }
            }
            
            void processDispatch() {
#if ELPP_LOGGING_ENABLED
                if (ELPP->hasFlag(LoggingFlag::MultiLoggerSupport)) {
                    bool firstDispatched = false;
                    base::type::string_t logMessage;
                    std::size_t i = 0;
                    do {
                        if (m_proceed) {
                            if (firstDispatched) {
                                m_logger->stream() << logMessage;
                            } else {
                                firstDispatched = true;
                                if (m_loggerIds.size() > 1) {
                                    logMessage = m_logger->stream().str();
                                }
                            }
                            triggerDispatch();
                        } else if (m_logger != nullptr) {
                            m_logger->stream().str(ELPP_LITERAL(""));
                            m_logger->releaseLock();
                        }
                        if (i + 1 < m_loggerIds.size()) {
                            initializeLogger(m_loggerIds.at(i + 1));
                        }
                    } while (++i < m_loggerIds.size());
                } else {
                    if (m_proceed) {
                        triggerDispatch();
                    } else if (m_logger != nullptr) {
                        m_logger->stream().str(ELPP_LITERAL(""));
                        m_logger->releaseLock();
                    }
                }
#else
                if (m_logger != nullptr) {
                    m_logger->stream().str(ELPP_LITERAL(""));
                    m_logger->releaseLock();
                }
#endif // ELPP_LOGGING_ENABLED
            }
            
            void triggerDispatch(void) {
                if (m_proceed) {
                    base::LogDispatcher(m_proceed, LogMessage(m_level, m_file, m_line, m_func, m_verboseLevel,
                                                              m_logger), m_dispatchAction).dispatch();
                }
                if (m_logger != nullptr) {
                    m_logger->stream().str(ELPP_LITERAL(""));
                    m_logger->releaseLock();
                }
                if (m_proceed && m_level == Level::Fatal
                    && !ELPP->hasFlag(LoggingFlag::DisableApplicationAbortOnFatalLog)) {
                    base::Writer(Level::Warning, m_file, m_line, m_func).construct(1, base::consts::kDefaultLoggerId)
                    << "Aborting application. Reason: Fatal log at [" << m_file << ":" << m_line << "]";
                    std::stringstream reasonStream;
                    reasonStream << "Fatal log at [" << m_file << ":" << m_line << "]"
                    << " If you wish to disable 'abort on fatal log' please use "
                    << "el::Helpers::addFlag(el::LoggingFlag::DisableApplicationAbortOnFatalLog)";
                    base::utils::abort(1, reasonStream.str());
                }
                m_proceed = false;
            }
        };
        class PErrorWriter : public base::Writer {
        public:
            PErrorWriter(Level level, const char* file, unsigned long int line,
                         const char* func, base::DispatchAction dispatchAction = base::DispatchAction::NormalLog,
                         base::type::VerboseLevel verboseLevel = 0) :
            base::Writer(level, file, line, func, dispatchAction, verboseLevel) {
            }
            
            virtual ~PErrorWriter(void) {
                if (m_proceed) {
#if ELPP_COMPILER_MSVC
                    char buff[256];
                    strerror_s(buff, 256, errno);
                    m_logger->stream() << ": " << buff << " [" << errno << "]";
#else
                    m_logger->stream() << ": " << strerror(errno) << " [" << errno << "]";
#endif
                }
            }
        };
    }  // namespace base
    // Logging from Logger class. Why this is here? Because we have Storage and Writer class available
#if ELPP_VARIADIC_TEMPLATES_SUPPORTED
    template <typename T, typename... Args>
    void Logger::log_(Level level, int vlevel, const char* s, const T& value, const Args&... args) {
        base::MessageBuilder b;
        b.initialize(this);
        while (*s) {
            if (*s == base::consts::kFormatSpecifierChar) {
                if (*(s + 1) == base::consts::kFormatSpecifierChar) {
                    ++s;
                } else {
                    if (*(s + 1) == base::consts::kFormatSpecifierCharValue) {
                        ++s;
                        b << value;
                        log_(level, vlevel, ++s, args...);
                        return;
                    }
                }
            }
            b << *s++;
        }
        ELPP_INTERNAL_ERROR("Too many arguments provided. Unable to handle. Please provide more format specifiers", false);
    }
    template <typename T>
    inline void Logger::log_(Level level, int vlevel, const T& log) {
        if (level == Level::Verbose) {
            if (ELPP->vRegistry()->allowed(vlevel, __FILE__)) {
                base::Writer(Level::Verbose, "FILE", 0, "FUNCTION",
                             base::DispatchAction::NormalLog, vlevel).construct(this, false) << log;
            } else {
                stream().str(ELPP_LITERAL(""));
            }
        } else {
            base::Writer(level, "FILE", 0, "FUNCTION").construct(this, false) << log;
        }
    }
    template <typename T, typename... Args>
    void Logger::log(Level level, const char* s, const T& value, const Args&... args) {
        base::threading::ScopedLock scopedLock(lock());
        log_(level, 0, s, value, args...);
    }
    template <typename T>
    inline void Logger::log(Level level, const T& log) {
        base::threading::ScopedLock scopedLock(lock());
        log_(level, 0, log);
    }
#   if ELPP_VERBOSE_LOG
    template <typename T, typename... Args>
    inline void Logger::verbose(int vlevel, const char* s, const T& value, const Args&... args) {
        base::threading::ScopedLock scopedLock(lock());
        log_(el::Level::Verbose, vlevel, s, value, args...);
    }
    template <typename T>
    inline void Logger::verbose(int vlevel, const T& log) {
        base::threading::ScopedLock scopedLock(lock());
        log_(el::Level::Verbose, vlevel, log);
    }
#   else
    template <typename T, typename... Args>
    inline void Logger::verbose(int, const char*, const T&, const Args&...) {
        return;
    }
    template <typename T>
    inline void Logger::verbose(int, const T&) {
        return;
    }
#   endif  // ELPP_VERBOSE_LOG
#   define LOGGER_LEVEL_WRITERS(FUNCTION_NAME, LOG_LEVEL)\
template <typename T, typename... Args>\
inline void Logger::FUNCTION_NAME(const char* s, const T& value, const Args&... args) {\
log(LOG_LEVEL, s, value, args...);\
}\
template <typename T>\
inline void Logger::FUNCTION_NAME(const T& value) {\
log(LOG_LEVEL, value);\
}
#   define LOGGER_LEVEL_WRITERS_DISABLED(FUNCTION_NAME, LOG_LEVEL)\
template <typename T, typename... Args>\
inline void Logger::FUNCTION_NAME(const char*, const T&, const Args&...) {\
return;\
}\
template <typename T>\
inline void Logger::FUNCTION_NAME(const T&) {\
return;\
}
    
#   if ELPP_INFO_LOG
    LOGGER_LEVEL_WRITERS(info, Level::Info)
#   else
    LOGGER_LEVEL_WRITERS_DISABLED(info, Level::Info)
#   endif // ELPP_INFO_LOG
#   if ELPP_DEBUG_LOG
    LOGGER_LEVEL_WRITERS(debug, Level::Debug)
#   else
    LOGGER_LEVEL_WRITERS_DISABLED(debug, Level::Debug)
#   endif // ELPP_DEBUG_LOG
#   if ELPP_WARNING_LOG
    LOGGER_LEVEL_WRITERS(warn, Level::Warning)
#   else
    LOGGER_LEVEL_WRITERS_DISABLED(warn, Level::Warning)
#   endif // ELPP_WARNING_LOG
#   if ELPP_ERROR_LOG
    LOGGER_LEVEL_WRITERS(error, Level::Error)
#   else
    LOGGER_LEVEL_WRITERS_DISABLED(error, Level::Error)
#   endif // ELPP_ERROR_LOG
#   if ELPP_FATAL_LOG
    LOGGER_LEVEL_WRITERS(fatal, Level::Fatal)
#   else
    LOGGER_LEVEL_WRITERS_DISABLED(fatal, Level::Fatal)
#   endif // ELPP_FATAL_LOG
#   if ELPP_TRACE_LOG
    LOGGER_LEVEL_WRITERS(trace, Level::Trace)
#   else
    LOGGER_LEVEL_WRITERS_DISABLED(trace, Level::Trace)
#   endif // ELPP_TRACE_LOG
#   undef LOGGER_LEVEL_WRITERS
#   undef LOGGER_LEVEL_WRITERS_DISABLED
#endif // ELPP_VARIADIC_TEMPLATES_SUPPORTED
#if ELPP_COMPILER_MSVC
#   define ELPP_VARIADIC_FUNC_MSVC(variadicFunction, variadicArgs) variadicFunction variadicArgs
#   define ELPP_VARIADIC_FUNC_MSVC_RUN(variadicFunction, ...) ELPP_VARIADIC_FUNC_MSVC(variadicFunction, (__VA_ARGS__))
#   define el_getVALength(...) ELPP_VARIADIC_FUNC_MSVC_RUN(el_resolveVALength, 0, ## __VA_ARGS__,\
10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0)
#else
#   if ELPP_COMPILER_CLANG
#      define el_getVALength(...) el_resolveVALength(0, __VA_ARGS__, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0)
#   else
#      define el_getVALength(...) el_resolveVALength(0, ## __VA_ARGS__, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0)
#   endif // ELPP_COMPILER_CLANG
#endif // ELPP_COMPILER_MSVC
#define el_resolveVALength(_0, _1, _2, _3, _4, _5, _6, _7, _8, _9, _10, N, ...) N
#define ELPP_WRITE_LOG(writer, level, dispatchAction, ...) \
writer(level, __FILE__, __LINE__, ELPP_FUNC, dispatchAction).construct(el_getVALength(__VA_ARGS__), __VA_ARGS__)
#define ELPP_WRITE_LOG_IF(writer, condition, level, dispatchAction, ...) if (condition) \
writer(level, __FILE__, __LINE__, ELPP_FUNC, dispatchAction).construct(el_getVALength(__VA_ARGS__), __VA_ARGS__)
#define ELPP_WRITE_LOG_EVERY_N(writer, occasion, level, dispatchAction, ...) \
if (ELPP->validateEveryNCounter(__FILE__, __LINE__, occasion)) \
writer(level, __FILE__, __LINE__, ELPP_FUNC, dispatchAction).construct(el_getVALength(__VA_ARGS__), __VA_ARGS__)
#define ELPP_WRITE_LOG_AFTER_N(writer, n, level, dispatchAction, ...) \
if (ELPP->validateAfterNCounter(__FILE__, __LINE__, n)) \
writer(level, __FILE__, __LINE__, ELPP_FUNC, dispatchAction).construct(el_getVALength(__VA_ARGS__), __VA_ARGS__)
#define ELPP_WRITE_LOG_N_TIMES(writer, n, level, dispatchAction, ...) \
if (ELPP->validateNTimesCounter(__FILE__, __LINE__, n)) \
writer(level, __FILE__, __LINE__, ELPP_FUNC, dispatchAction).construct(el_getVALength(__VA_ARGS__), __VA_ARGS__)
#undef ELPP_CURR_FILE_PERFORMANCE_LOGGER
#if defined(ELPP_PERFORMANCE_LOGGER)
#   define ELPP_CURR_FILE_PERFORMANCE_LOGGER ELPP_PERFORMANCE_LOGGER
#else
#   define ELPP_CURR_FILE_PERFORMANCE_LOGGER el::base::consts::kPerformanceLoggerId
#endif
    class PerformanceTrackingData {
    public:
        enum class DataType : base::type::EnumType {
            Checkpoint = 1, Complete = 2
        };
        // Do not use constructor, will run into multiple definition error, use init(PerformanceTracker*)
        explicit PerformanceTrackingData(DataType dataType) : m_performanceTracker(nullptr),
        m_dataType(dataType), m_file(""), m_line(0), m_func("") {}
        inline const std::string* blockName(void) const;
        inline const struct timeval* startTime(void) const;
        inline const struct timeval* endTime(void) const;
        inline const struct timeval* lastCheckpointTime(void) const;
        inline const base::PerformanceTracker* performanceTracker(void) const { return m_performanceTracker; }
        inline PerformanceTrackingData::DataType dataType(void) const { return m_dataType; }
        inline bool firstCheckpoint(void) const { return m_firstCheckpoint; }
        inline std::string checkpointId(void) const { return m_checkpointId; }
        inline const char* file(void) const { return m_file; }
        inline unsigned long int line(void) const { return m_line; }
        inline const char* func(void) const { return m_func; }
        inline const base::type::string_t* formattedTimeTaken() const { return &m_formattedTimeTaken; }
        inline const std::string& loggerId(void) const;
    private:
        base::PerformanceTracker* m_performanceTracker;
        base::type::string_t m_formattedTimeTaken;
        PerformanceTrackingData::DataType m_dataType;
        bool m_firstCheckpoint;
        std::string m_checkpointId;
        const char* m_file;
        unsigned long int m_line;
        const char* m_func;
        inline void init(base::PerformanceTracker* performanceTracker, bool firstCheckpoint = false) {
            m_performanceTracker = performanceTracker;
            m_firstCheckpoint = firstCheckpoint;
        }
        
        friend class el::base::PerformanceTracker;
    };
    namespace base {
        /// @brief Represents performanceTracker block of code that conditionally adds performance status to log
        ///        either when goes outside the scope of when checkpoint() is called
        class PerformanceTracker : public base::threading::ThreadSafe, public Loggable {
        public:
            PerformanceTracker(const std::string& blockName,
                               base::TimestampUnit timestampUnit = base::TimestampUnit::Millisecond,
                               const std::string& loggerId = std::string(ELPP_CURR_FILE_PERFORMANCE_LOGGER),
                               bool scopedLog = true, Level level = base::consts::kPerformanceTrackerDefaultLevel) :
            m_blockName(blockName), m_timestampUnit(timestampUnit), m_loggerId(loggerId), m_scopedLog(scopedLog),
            m_level(level), m_hasChecked(false), m_lastCheckpointId(std::string()), m_enabled(false) {
#if !defined(ELPP_DISABLE_PERFORMANCE_TRACKING) && ELPP_LOGGING_ENABLED
                // We store it locally so that if user happen to change configuration by the end of scope
                // or before calling checkpoint, we still depend on state of configuraton at time of construction
                el::Logger* loggerPtr = ELPP->registeredLoggers()->get(loggerId, false);
                m_enabled = loggerPtr != nullptr && loggerPtr->m_typedConfigurations->performanceTracking(m_level);
                if (m_enabled) {
                    base::utils::DateTime::gettimeofday(&m_startTime);
                }
#endif  // !defined(ELPP_DISABLE_PERFORMANCE_TRACKING) && ELPP_LOGGING_ENABLED
            }
            /// @brief Copy constructor
            PerformanceTracker(const PerformanceTracker& t) :
            m_blockName(t.m_blockName), m_timestampUnit(t.m_timestampUnit), m_loggerId(t.m_loggerId), m_scopedLog(t.m_scopedLog),
            m_level(t.m_level), m_hasChecked(t.m_hasChecked), m_lastCheckpointId(t.m_lastCheckpointId), m_enabled(t.m_enabled),
            m_startTime(t.m_startTime), m_endTime(t.m_endTime), m_lastCheckpointTime(t.m_lastCheckpointTime) {
            }
            virtual ~PerformanceTracker(void) {
#if !defined(ELPP_DISABLE_PERFORMANCE_TRACKING) && ELPP_LOGGING_ENABLED
                if (m_enabled) {
                    base::threading::ScopedLock scopedLock(lock());
                    if (m_scopedLog) {
                        base::utils::DateTime::gettimeofday(&m_endTime);
                        base::type::string_t formattedTime = getFormattedTimeTaken();
                        PerformanceTrackingData data(PerformanceTrackingData::DataType::Complete);
                        data.init(this);
                        data.m_formattedTimeTaken = formattedTime;
                        PerformanceTrackingCallback* callback = nullptr;
                        for (const std::pair<std::string, base::type::PerformanceTrackingCallbackPtr>& h
                             : ELPP->m_performanceTrackingCallbacks) {
                            callback = h.second.get();
                            if (callback != nullptr && callback->enabled()) {
                                callback->acquireLock();
                                callback->handle(&data);
                                callback->releaseLock();
                            }
                        }
                    }
                }
#endif  // !defined(ELPP_DISABLE_PERFORMANCE_TRACKING)
            }
            /// @brief A checkpoint for current performanceTracker block.
            void checkpoint(const std::string& id = std::string(), const char* file = __FILE__, unsigned long int line = __LINE__, const char* func = "") {
#if !defined(ELPP_DISABLE_PERFORMANCE_TRACKING) && ELPP_LOGGING_ENABLED
                if (m_enabled) {
                    base::threading::ScopedLock scopedLock(lock());
                    base::utils::DateTime::gettimeofday(&m_endTime);
                    base::type::string_t formattedTime = m_hasChecked ? getFormattedTimeTaken(m_lastCheckpointTime) : ELPP_LITERAL("");
                    PerformanceTrackingData data(PerformanceTrackingData::DataType::Checkpoint);
                    data.init(this);
                    data.m_checkpointId = id;
                    data.m_file = file;
                    data.m_line = line;
                    data.m_func = func;
                    data.m_formattedTimeTaken = formattedTime;
                    PerformanceTrackingCallback* callback = nullptr;
                    for (const std::pair<std::string, base::type::PerformanceTrackingCallbackPtr>& h
                         : ELPP->m_performanceTrackingCallbacks) {
                        callback = h.second.get();
                        if (callback != nullptr && callback->enabled()) {
                            callback->acquireLock();
                            callback->handle(&data);
                            callback->releaseLock();
                        }
                    }
                    base::utils::DateTime::gettimeofday(&m_lastCheckpointTime);
                    m_hasChecked = true;
                    m_lastCheckpointId = id;
                }
#endif  // !defined(ELPP_DISABLE_PERFORMANCE_TRACKING) && ELPP_LOGGING_ENABLED
                ELPP_UNUSED(id);
                ELPP_UNUSED(file);
                ELPP_UNUSED(line);
                ELPP_UNUSED(func);
            }
            inline Level level(void) const { return m_level; }
        private:
            std::string m_blockName;
            base::TimestampUnit m_timestampUnit;
            std::string m_loggerId;
            bool m_scopedLog;
            Level m_level;
            bool m_hasChecked;
            std::string m_lastCheckpointId;
            bool m_enabled;
            struct timeval m_startTime, m_endTime, m_lastCheckpointTime;
            
            PerformanceTracker(void);
            
            friend class el::PerformanceTrackingData;
            friend class base::DefaultPerformanceTrackingCallback;
            
            const inline base::type::string_t getFormattedTimeTaken() const {
                return getFormattedTimeTaken(m_startTime);
            }
            
            const base::type::string_t getFormattedTimeTaken(struct timeval startTime) const {
                if (ELPP->hasFlag(LoggingFlag::FixedTimeFormat)) {
                    base::type::stringstream_t ss;
                    ss << base::utils::DateTime::getTimeDifference(m_endTime,
                                                                   startTime, m_timestampUnit) << " " << base::consts::kTimeFormats[static_cast<base::type::EnumType>(m_timestampUnit)].unit;
                    return ss.str();
                }
                return base::utils::DateTime::formatTime(base::utils::DateTime::getTimeDifference(m_endTime,
                                                                                                  startTime, m_timestampUnit), m_timestampUnit);
            }
            
            virtual inline void log(el::base::type::ostream_t& os) const {
                os << getFormattedTimeTaken();
            }
        };
        class DefaultPerformanceTrackingCallback : public PerformanceTrackingCallback {
        protected:
            void handle(const PerformanceTrackingData* data) {
                m_data = data;
                base::type::stringstream_t ss;
                if (m_data->dataType() == PerformanceTrackingData::DataType::Complete) {
                    ss << ELPP_LITERAL("Executed [") << m_data->blockName()->c_str() << ELPP_LITERAL("] in [") << *m_data->formattedTimeTaken() << ELPP_LITERAL("]");
                } else {
                    ss << ELPP_LITERAL("Performance checkpoint");
                    if (!m_data->checkpointId().empty()) {
                        ss << ELPP_LITERAL(" [") << m_data->checkpointId().c_str() << ELPP_LITERAL("]");
                    }
                    ss << ELPP_LITERAL(" for block [") << m_data->blockName()->c_str() << ELPP_LITERAL("] : [") << *m_data->performanceTracker();
                    if (!ELPP->hasFlag(LoggingFlag::DisablePerformanceTrackingCheckpointComparison) && m_data->performanceTracker()->m_hasChecked) {
                        ss << ELPP_LITERAL(" ([") << *m_data->formattedTimeTaken() << ELPP_LITERAL("] from ");
                        if (m_data->performanceTracker()->m_lastCheckpointId.empty()) {
                            ss << ELPP_LITERAL("last checkpoint");
                        } else {
                            ss << ELPP_LITERAL("checkpoint '") << m_data->performanceTracker()->m_lastCheckpointId.c_str() << ELPP_LITERAL("'");
                        }
                        ss << ELPP_LITERAL(")]");
                    } else {
                        ss << ELPP_LITERAL("]");
                    }
                }
                el::base::Writer(m_data->performanceTracker()->level(), m_data->file(), m_data->line(), m_data->func()).construct(1, m_data->loggerId().c_str()) << ss.str();
            }
        private:
            const PerformanceTrackingData* m_data;
        };
    }  // namespace base
    inline const std::string* PerformanceTrackingData::blockName() const {
        return const_cast<const std::string*>(&m_performanceTracker->m_blockName);
    }
    inline const struct timeval* PerformanceTrackingData::startTime() const {
        return const_cast<const struct timeval*>(&m_performanceTracker->m_startTime);
    }
    inline const struct timeval* PerformanceTrackingData::endTime() const {
        return const_cast<const struct timeval*>(&m_performanceTracker->m_endTime);
    }
    inline const struct timeval* PerformanceTrackingData::lastCheckpointTime() const {
        return const_cast<const struct timeval*>(&m_performanceTracker->m_lastCheckpointTime);
    }
    inline const std::string& PerformanceTrackingData::loggerId(void) const { return m_performanceTracker->m_loggerId; }
    namespace base {
        /// @brief Contains some internal debugging tools like crash handler and stack tracer
        namespace debug {
            class StackTrace : base::NoCopy {
            public:
                static const std::size_t kMaxStack = 64;
                static const std::size_t kStackStart = 2;  // We want to skip c'tor and StackTrace::generateNew()
                class StackTraceEntry {
                public:
                    StackTraceEntry(std::size_t index, const char* loc, const char* demang, const char* hex, const char* addr) {
                        m_index = index;
                        m_location = std::string(loc);
                        m_demangled = std::string(demang);
                        m_hex = std::string(hex);
                        m_addr = std::string(addr);
                    }
                    StackTraceEntry(std::size_t index, char* loc) {
                        m_index = index;
                        m_location = std::string(loc);
                    }
                    std::size_t m_index;
                    std::string m_location;
                    std::string m_demangled;
                    std::string m_hex;
                    std::string m_addr;
                    friend std::ostream& operator<<(std::ostream& ss, const StackTraceEntry& si) {
                        ss << "[" << si.m_index << "] " << si.m_location << (si.m_demangled.empty() ? "" : ":") << si.m_demangled
                        << (si.m_hex.empty() ? "" : "+") << si.m_hex << si.m_addr;
                        return ss;
                    }
                    
                private:
                    StackTraceEntry(void);
                };
                
                StackTrace(void) {
                    generateNew();
                }
                
                virtual ~StackTrace(void) {
                }
                
                inline std::vector<StackTraceEntry>& getLatestStack(void) {
                    return m_stack;
                }
                
                friend inline std::ostream& operator<<(std::ostream& os, const StackTrace& st) {
                    std::vector<StackTraceEntry>::const_iterator it = st.m_stack.begin();
                    while (it != st.m_stack.end()) {
                        os << "    " << *it++ << "\n";
                    }
                    return os;
                }
                
            private:
                std::vector<StackTraceEntry> m_stack;
                
                void generateNew(void) {
#if ELPP_STACKTRACE
                    m_stack.clear();
                    void* stack[kMaxStack];
                    std::size_t size = backtrace(stack, kMaxStack);
                    char** strings = backtrace_symbols(stack, size);
                    if (size > kStackStart) {  // Skip StackTrace c'tor and generateNew
                        for (std::size_t i = kStackStart; i < size; ++i) {
                            char* mangName = nullptr;
                            char* hex = nullptr;
                            char* addr = nullptr;
                            for (char* c = strings[i]; *c; ++c) {
                                switch (*c) {
                                    case '(':
                                        mangName = c;
                                        break;
                                    case '+':
                                        hex = c;
                                        break;
                                    case ')':
                                        addr = c;
                                        break;
                                    default:
                                        break;
                                }
                            }
                            // Perform demangling if parsed properly
                            if (mangName != nullptr && hex != nullptr && addr != nullptr && mangName < hex) {
                                *mangName++ = '\0';
                                *hex++ = '\0';
                                *addr++ = '\0';
                                int status = 0;
                                char* demangName = abi::__cxa_demangle(mangName, 0, 0, &status);
                                // if demangling is successful, output the demangled function name
                                if (status == 0) {
                                    // Success (see http://gcc.gnu.org/onlinedocs/libstdc++/libstdc++-html-USERS-4.3/a01696.html)
                                    StackTraceEntry entry(i - 1, strings[i], demangName, hex, addr);
                                    m_stack.push_back(entry);
                                } else {
                                    // Not successful - we will use mangled name
                                    StackTraceEntry entry(i - 1, strings[i], mangName, hex, addr);
                                    m_stack.push_back(entry);
                                }
                                free(demangName);
                            } else {
                                StackTraceEntry entry(i - 1, strings[i]);
                                m_stack.push_back(entry);
                            }
                        }
                    }
                    free(strings);
#else
                    ELPP_INTERNAL_INFO(1, "Stacktrace generation not supported for selected compiler");
#endif  // ELPP_STACKTRACE
                }
            };
            static std::string crashReason(int sig) {
                std::stringstream ss;
                bool foundReason = false;
                for (int i = 0; i < base::consts::kCrashSignalsCount; ++i) {
                    if (base::consts::kCrashSignals[i].numb == sig) {
                        ss << "Application has crashed due to [" << base::consts::kCrashSignals[i].name << "] signal";
                        if (ELPP->hasFlag(el::LoggingFlag::LogDetailedCrashReason)) {
                            ss << std::endl <<
                            "    " << base::consts::kCrashSignals[i].brief << std::endl <<
                            "    " << base::consts::kCrashSignals[i].detail;
                        }
                        foundReason = true;
                    }
                }
                if (!foundReason) {
                    ss << "Application has crashed due to unknown signal [" << sig << "]";
                }
                return ss.str();
            }
            /// @brief Logs reason of crash from sig
            static void logCrashReason(int sig, bool stackTraceIfAvailable, Level level, const char* logger) {
                std::stringstream ss;
                ss << "CRASH HANDLED; ";
                ss << crashReason(sig);
#if ELPP_STACKTRACE
                if (stackTraceIfAvailable) {
                    ss << std::endl << "    ======= Backtrace: =========" << std::endl << base::debug::StackTrace();
                }
#else
                ELPP_UNUSED(stackTraceIfAvailable);
#endif  // ELPP_STACKTRACE
                ELPP_WRITE_LOG(el::base::Writer, level, base::DispatchAction::NormalLog, logger) << ss.str();
            }
            static inline void crashAbort(int sig) {
                base::utils::abort(sig);
            }
            /// @brief Default application crash handler
            ///
            /// @detail This function writes log using 'default' logger, prints stack trace for GCC based compilers and aborts program.
            static inline void defaultCrashHandler(int sig) {
                base::debug::logCrashReason(sig, true, Level::Fatal, base::consts::kDefaultLoggerId);
                base::debug::crashAbort(sig);
            }
            /// @brief Handles unexpected crashes
            class CrashHandler : base::NoCopy {
            public:
                typedef void (*Handler)(int);
                
                explicit CrashHandler(bool useDefault) {
                    if (useDefault) {
                        setHandler(defaultCrashHandler);
                    }
                }
                explicit CrashHandler(const Handler& cHandler) {
                    setHandler(cHandler);
                }
                void setHandler(const Handler& cHandler) {
                    m_handler = cHandler;
#if defined(ELPP_HANDLE_SIGABRT)
                    int i = 0;  // SIGABRT is at base::consts::kCrashSignals[0]
#else
                    int i = 1;
#endif  // defined(ELPP_HANDLE_SIGABRT)
                    for (; i < base::consts::kCrashSignalsCount; ++i) {
                        m_handler = signal(base::consts::kCrashSignals[i].numb, cHandler);
                    }
                }
                
            private:
                Handler m_handler;
            };
        }  // namespace debug
    }  // namespace base
    extern base::debug::CrashHandler elCrashHandler;
#define MAKE_LOGGABLE(ClassType, ClassInstance, OutputStreamInstance) \
el::base::type::ostream_t& operator<<(el::base::type::ostream_t& OutputStreamInstance, const ClassType& ClassInstance)
    /// @brief Initializes syslog with process ID, options and facility. calls closelog() on d'tor
    class SysLogInitializer {
    public:
        SysLogInitializer(const char* processIdent, int options = 0, int facility = 0) {
#if defined(ELPP_SYSLOG)
            openlog(processIdent, options, facility);
#else
            ELPP_UNUSED(processIdent);
            ELPP_UNUSED(options);
            ELPP_UNUSED(facility);
#endif  // defined(ELPP_SYSLOG)
        }
        virtual ~SysLogInitializer(void) {
#if defined(ELPP_SYSLOG)
            closelog();
#endif  // defined(ELPP_SYSLOG)
        }
    };
#define ELPP_INITIALIZE_SYSLOG(id, opt, fac) el::SysLogInitializer elSyslogInit(id, opt, fac)
    /// @brief Static helpers for developers
    class Helpers : base::StaticClass {
    public:
        /// @brief Shares logging repository (base::Storage)
        static inline void setStorage(base::type::StoragePointer storage) {
            ELPP = storage;
        }
        /// @return Main storage repository
        static inline base::type::StoragePointer storage() {
            return ELPP;
        }
        /// @brief Sets application arguments and figures out whats active for logging and whats not.
        static inline void setArgs(int argc, char** argv) {
            ELPP->setApplicationArguments(argc, argv);
        }
        /// @copydoc setArgs(int argc, char** argv)
        static inline void setArgs(int argc, const char** argv) {
            ELPP->setApplicationArguments(argc, const_cast<char**>(argv));
        }
        /// @brief Overrides default crash handler and installs custom handler.
        /// @param crashHandler A functor with no return type that takes single int argument.
        ///        Handler is a typedef with specification: void (*Handler)(int)
        static inline void setCrashHandler(const el::base::debug::CrashHandler::Handler& crashHandler) {
            el::elCrashHandler.setHandler(crashHandler);
        }
        /// @brief Abort due to crash with signal in parameter
        /// @param sig Crash signal
        static inline void crashAbort(int sig, const char* sourceFile = "", unsigned int long line = 0) {
            std::stringstream ss;
            ss << base::debug::crashReason(sig).c_str();
            ss << " - [Called el::Helpers::crashAbort(" << sig << ")]";
            if (sourceFile != nullptr && strlen(sourceFile) > 0) {
                ss << " - Source: " << sourceFile;
                if (line > 0)
                    ss << ":" << line;
                else
                    ss << " (line number not specified)";
            }
            base::utils::abort(sig, ss.str());
        }
        /// @brief Logs reason of crash as per sig
        /// @param sig Crash signal
        /// @param stackTraceIfAvailable Includes stack trace if available
        /// @param level Logging level
        /// @param logger Logger to use for logging
        static inline void logCrashReason(int sig, bool stackTraceIfAvailable = false,
                                          Level level = Level::Fatal, const char* logger = base::consts::kDefaultLoggerId) {
            el::base::debug::logCrashReason(sig, stackTraceIfAvailable, level, logger);
        }
        /// @brief Installs pre rollout callback, this callback is triggered when log file is about to be rolled out
        ///        (can be useful for backing up)
        static inline void installPreRollOutCallback(const PreRollOutCallback& callback) {
            ELPP->setPreRollOutCallback(callback);
        }
        /// @brief Uninstalls pre rollout callback
        static inline void uninstallPreRollOutCallback(void) {
            ELPP->unsetPreRollOutCallback();
        }
        /// @brief Installs post log dispatch callback, this callback is triggered when log is dispatched
        template <typename T>
        static inline bool installLogDispatchCallback(const std::string& id) {
            return ELPP->installLogDispatchCallback<T>(id);
        }
        /// @brief Uninstalls log dispatch callback
        template <typename T>
        static inline void uninstallLogDispatchCallback(const std::string& id) {
            ELPP->uninstallLogDispatchCallback<T>(id);
        }
        template <typename T>
        static inline T* logDispatchCallback(const std::string& id) {
            return ELPP->logDispatchCallback<T>(id);
        }
        /// @brief Installs post performance tracking callback, this callback is triggered when performance tracking is finished
        template <typename T>
        static inline bool installPerformanceTrackingCallback(const std::string& id) {
            return ELPP->installPerformanceTrackingCallback<T>(id);
        }
        /// @brief Uninstalls post performance tracking handler
        template <typename T>
        static inline void uninstallPerformanceTrackingCallback(const std::string& id) {
            ELPP->uninstallPerformanceTrackingCallback<T>(id);
        }
        template <typename T>
        static inline T* performanceTrackingCallback(const std::string& id) {
            return ELPP->performanceTrackingCallback<T>(id);
        }
        /// @brief Converts template to std::string - useful for loggable classes to log containers within log(std::ostream&) const
        template <typename T>
        static std::string convertTemplateToStdString(const T& templ) {
            el::Logger* logger = 
            ELPP->registeredLoggers()->get(el::base::consts::kDefaultLoggerId);
            if (logger == nullptr) {
                return std::string();
            }
            base::MessageBuilder b;
            b.initialize(logger);
            logger->acquireLock();
            b << templ;
#if defined(ELPP_UNICODE)
            std::string s = std::string(logger->stream().str().begin(), logger->stream().str().end());
#else
            std::string s = logger->stream().str();
#endif  // defined(ELPP_UNICODE)
            logger->stream().str(ELPP_LITERAL(""));
            logger->releaseLock();
            return s;
        }
        /// @brief Returns command line arguments (pointer) provided to easylogging++
        static inline const el::base::utils::CommandLineArgs* commandLineArgs(void) {
            return ELPP->commandLineArgs();
        }
        /// @brief Installs user defined format specifier and handler
        static inline void installCustomFormatSpecifier(const CustomFormatSpecifier& customFormatSpecifier) {
            ELPP->installCustomFormatSpecifier(customFormatSpecifier);
        }
        /// @brief Uninstalls user defined format specifier and handler
        static inline bool uninstallCustomFormatSpecifier(const char* formatSpecifier) {
            return ELPP->uninstallCustomFormatSpecifier(formatSpecifier);
        }
        /// @brief Returns true if custom format specifier is installed
        static inline bool hasCustomFormatSpecifier(const char* formatSpecifier) {
            return ELPP->hasCustomFormatSpecifier(formatSpecifier);
        }
        static inline void validateFileRolling(Logger* logger, Level level) {
            if (logger == nullptr) return;
            logger->m_typedConfigurations->validateFileRolling(level, ELPP->preRollOutCallback());
        }
    };
    /// @brief Static helpers to deal with loggers and their configurations
    class Loggers : base::StaticClass {
    public:
        /// @brief Gets existing or registers new logger
        static inline Logger* getLogger(const std::string& identity, bool registerIfNotAvailable = true) {
            base::threading::ScopedLock scopedLock(ELPP->lock());
            return ELPP->registeredLoggers()->get(identity, registerIfNotAvailable);
        }
        /// @brief Unregisters logger - use it only when you know what you are doing, you may unregister
        ///        loggers initialized / used by third-party libs.
        static inline bool unregisterLogger(const std::string& identity) {
            base::threading::ScopedLock scopedLock(ELPP->lock());
            return ELPP->registeredLoggers()->remove(identity);
        }
        /// @brief Whether or not logger with id is registered
        static inline bool hasLogger(const std::string& identity) {
            base::threading::ScopedLock scopedLock(ELPP->lock());
            return ELPP->registeredLoggers()->has(identity);
        }
        /// @brief Reconfigures specified logger with new configurations
        static inline Logger* reconfigureLogger(Logger* logger, const Configurations& configurations) {
            if (!logger) return nullptr;
            logger->configure(configurations);
            return logger;
        }
        /// @brief Reconfigures logger with new configurations after looking it up using identity
        static inline Logger* reconfigureLogger(const std::string& identity, const Configurations& configurations) {
            return Loggers::reconfigureLogger(Loggers::getLogger(identity), configurations);
        }
        /// @brief Reconfigures logger's single configuration
        static inline Logger* reconfigureLogger(const std::string& identity, ConfigurationType configurationType,
                                                const std::string& value) {
            Logger* logger = Loggers::getLogger(identity);
            if (logger == nullptr) {
                return nullptr;
            }
            logger->configurations()->set(Level::Global, configurationType, value);
            logger->reconfigure();
            return logger;
        }
        /// @brief Reconfigures all the existing loggers with new configurations
        static inline void reconfigureAllLoggers(const Configurations& configurations) {
            for (base::RegisteredLoggers::iterator it = ELPP->registeredLoggers()->begin();
                 it != ELPP->registeredLoggers()->end(); ++it) {
                Loggers::reconfigureLogger(it->second, configurations);
            }
        }
        /// @brief Reconfigures single configuration for all the loggers
        static inline void reconfigureAllLoggers(ConfigurationType configurationType, const std::string& value) {
            reconfigureAllLoggers(Level::Global, configurationType, value);
        }
        /// @brief Reconfigures single configuration for all the loggers for specified level
        static inline void reconfigureAllLoggers(Level level, ConfigurationType configurationType, 
                                                 const std::string& value) {
            for (base::RegisteredLoggers::iterator it = ELPP->registeredLoggers()->begin();
                 it != ELPP->registeredLoggers()->end(); ++it) {
                Logger* logger = it->second;
                logger->configurations()->set(level, configurationType, value);
                logger->reconfigure();
            }
        }
        /// @brief Sets default configurations. This configuration is used for future (and conditionally for existing) loggers
        static inline void setDefaultConfigurations(const Configurations& configurations, bool reconfigureExistingLoggers = false) {
            ELPP->registeredLoggers()->setDefaultConfigurations(configurations);
            if (reconfigureExistingLoggers) {
                Loggers::reconfigureAllLoggers(configurations);
            }
        }
        /// @brief Returns current default
        static inline const Configurations* defaultConfigurations(void) {
            return ELPP->registeredLoggers()->defaultConfigurations();
        }
        /// @brief Returns log stream reference pointer if needed by user
        static inline const base::LogStreamsReferenceMap* logStreamsReference(void) {
            return ELPP->registeredLoggers()->logStreamsReference();
        }
        /// @brief Default typed configuration based on existing defaultConf
        static base::TypedConfigurations defaultTypedConfigurations(void) {
            return base::TypedConfigurations(
                                             ELPP->registeredLoggers()->defaultConfigurations(),
                                             ELPP->registeredLoggers()->logStreamsReference());
        }
        /// @brief Populates all logger IDs in current repository.
        /// @param [out] targetList List of fill up.
        static inline std::vector<std::string>* populateAllLoggerIds(std::vector<std::string>* targetList) {
            targetList->clear();
            for (base::RegisteredLoggers::iterator it = ELPP->registeredLoggers()->list().begin();
                 it != ELPP->registeredLoggers()->list().end(); ++it) {
                targetList->push_back(it->first);
            }
            return targetList;
        }
        /// @brief Sets configurations from global configuration file.
        static void configureFromGlobal(const char* globalConfigurationFilePath) {
            std::ifstream gcfStream(globalConfigurationFilePath, std::ifstream::in);
            ELPP_ASSERT(gcfStream.is_open(), "Unable to open global configuration file [" << globalConfigurationFilePath 
                        << "] for parsing.");
            std::string line = std::string();
            std::stringstream ss;
            Logger* logger = nullptr;
            auto configure = [&](void) {
                ELPP_INTERNAL_INFO(8, "Configuring logger: '" << logger->id() << "' with configurations \n" << ss.str() 
                                   << "\n--------------");
                Configurations c;
                c.parseFromText(ss.str());
                logger->configure(c);
            };
            while (gcfStream.good()) {
                std::getline(gcfStream, line);
                ELPP_INTERNAL_INFO(1, "Parsing line: " << line);
                base::utils::Str::trim(line);
                if (Configurations::Parser::isComment(line)) continue;
                Configurations::Parser::ignoreComments(&line);
                base::utils::Str::trim(line);
                if (line.size() > 2 && base::utils::Str::startsWith(line, std::string(base::consts::kConfigurationLoggerId))) {
                    if (!ss.str().empty() && logger != nullptr) {
                        configure();
                    }
                    ss.str(std::string(""));
                    line = line.substr(2);
                    base::utils::Str::trim(line);
                    if (line.size() > 1) {
                        ELPP_INTERNAL_INFO(1, "Getting logger: '" << line << "'");
                        logger = getLogger(line);
                    }
                } else {
                    ss << line << "\n";
                }
            }
            if (!ss.str().empty() && logger != nullptr) {
                configure();
            }
        }
        /// @brief Configures loggers using command line arg. Ensure you have already set command line args, 
        /// @return False if invalid argument or argument with no value provided, true if attempted to configure logger.
        ///         If true is returned that does not mean it has been configured successfully, it only means that it
        ///         has attempeted to configure logger using configuration file provided in argument
        static inline bool configureFromArg(const char* argKey) {
#if defined(ELPP_DISABLE_CONFIGURATION_FROM_PROGRAM_ARGS)
            ELPP_UNUSED(argKey);
#else
            if (!Helpers::commandLineArgs()->hasParamWithValue(argKey)) {
                return false;
            }
            configureFromGlobal(Helpers::commandLineArgs()->getParamValue(argKey));
#endif  // defined(ELPP_DISABLE_CONFIGURATION_FROM_PROGRAM_ARGS)
            return true;
        }
        /// @brief Flushes all loggers for all levels - Be careful if you dont know how many loggers are registered
        static inline void flushAll(void) {
            ELPP->registeredLoggers()->flushAll();
        }
        /// @brief Adds logging flag used internally.
        static inline void addFlag(LoggingFlag flag) {
            ELPP->addFlag(flag);
        }
        /// @brief Removes logging flag used internally.
        static inline void removeFlag(LoggingFlag flag) {
            ELPP->removeFlag(flag);
        }
        /// @brief Determines whether or not certain flag is active
        static inline bool hasFlag(LoggingFlag flag) {
            return ELPP->hasFlag(flag);
        }
        /// @brief Adds flag and removes it when scope goes out
        class ScopedAddFlag {
        public:
            ScopedAddFlag(LoggingFlag flag) : m_flag(flag) { Loggers::addFlag(m_flag); }
            ~ScopedAddFlag(void) { Loggers::removeFlag(m_flag); }
        private:
            LoggingFlag m_flag;
        };
        /// @brief Removes flag and add it when scope goes out
        class ScopedRemoveFlag {
        public:
            ScopedRemoveFlag(LoggingFlag flag) : m_flag(flag) { Loggers::removeFlag(m_flag); }
            ~ScopedRemoveFlag(void) { Loggers::addFlag(m_flag); }
        private:
            LoggingFlag m_flag;
        };
        /// @brief Sets hierarchy for logging. Needs to enable logging flag (HierarchicalLogging)
        static inline void setLoggingLevel(Level level) {
            ELPP->setLoggingLevel(level);
        }
        /// @brief Sets verbose level on the fly
        static inline void setVerboseLevel(base::type::VerboseLevel level) {
            ELPP->vRegistry()->setLevel(level);
        }
        /// @brief Gets current verbose level
        static inline base::type::VerboseLevel verboseLevel(void) {
            return ELPP->vRegistry()->level();
        }
        /// @brief Sets vmodules as specified (on the fly)
        static inline void setVModules(const char* modules) {
            if (ELPP->vRegistry()->vModulesEnabled()) {
                ELPP->vRegistry()->setModules(modules);
            }
        }
        /// @brief Clears vmodules
        static inline void clearVModules(void) {
            ELPP->vRegistry()->clearModules();
        }
    };
    class VersionInfo : base::StaticClass {
    public:
        /// @brief Current version number
        static inline const std::string version(void) { return std::string("9.84"); }
        /// @brief Release date of current version
        static inline const std::string releaseDate(void) { return std::string("29-07-2016 1221hrs"); }
    };
}  // namespace el
#undef VLOG_IS_ON
/// @brief Determines whether verbose logging is on for specified level current file.
#define VLOG_IS_ON(verboseLevel) (ELPP->vRegistry()->allowed(verboseLevel, __FILE__))
#undef TIMED_BLOCK
#undef TIMED_SCOPE
#undef TIMED_FUNC
#undef ELPP_MIN_UNIT
#if defined(ELPP_PERFORMANCE_MICROSECONDS)
#   define ELPP_MIN_UNIT el::base::TimestampUnit::Microsecond
#else
#   define ELPP_MIN_UNIT el::base::TimestampUnit::Millisecond
#endif  // (defined(ELPP_PERFORMANCE_MICROSECONDS))
/// @brief Performance tracked scope. Performance gets written when goes out of scope using
///        'performance' logger.
///
/// @detail Please note in order to check the performance at a certain time you can use obj.checkpoint();
/// @see el::base::PerformanceTracker
/// @see el::base::PerformanceTracker::checkpoint
// Note: Do not surround this definition with null macro because of obj instance
#define TIMED_SCOPE(obj, blockname) el::base::PerformanceTracker obj(blockname, ELPP_MIN_UNIT)
#define TIMED_BLOCK(obj, blockName) for (struct { int i; el::base::PerformanceTracker timer; } obj = { 0, \
el::base::PerformanceTracker(blockName, ELPP_MIN_UNIT) }; obj.i < 1; ++obj.i)
/// @brief Performance tracked function. Performance gets written when goes out of scope using
///        'performance' logger.
///
/// @detail Please note in order to check the performance at a certain time you can use obj.checkpoint();
/// @see el::base::PerformanceTracker
/// @see el::base::PerformanceTracker::checkpoint
#define TIMED_FUNC(obj) TIMED_SCOPE(obj, ELPP_FUNC)
#undef PERFORMANCE_CHECKPOINT
#undef PERFORMANCE_CHECKPOINT_WITH_ID
#define PERFORMANCE_CHECKPOINT(obj) obj.checkpoint(std::string(), __FILE__, __LINE__, ELPP_FUNC)
#define PERFORMANCE_CHECKPOINT_WITH_ID(obj, id) obj.checkpoint(id, __FILE__, __LINE__, ELPP_FUNC)
#undef ELPP_COUNTER
#undef ELPP_COUNTER_POS
/// @brief Gets hit counter for file/line
#define ELPP_COUNTER (ELPP->hitCounters()->getCounter(__FILE__, __LINE__))
/// @brief Gets hit counter position for file/line, -1 if not registered yet
#define ELPP_COUNTER_POS (ELPP_COUNTER == nullptr ? -1 : ELPP_COUNTER->hitCounts())
// Undef levels to support LOG(LEVEL)
#undef INFO
#undef WARNING
#undef DEBUG
#undef ERROR
#undef FATAL
#undef TRACE
#undef VERBOSE
// Undef existing
#undef CINFO
#undef CWARNING
#undef CDEBUG
#undef CFATAL
#undef CERROR
#undef CTRACE
#undef CVERBOSE
#undef CINFO_IF
#undef CWARNING_IF
#undef CDEBUG_IF
#undef CERROR_IF
#undef CFATAL_IF
#undef CTRACE_IF
#undef CVERBOSE_IF
#undef CINFO_EVERY_N
#undef CWARNING_EVERY_N
#undef CDEBUG_EVERY_N
#undef CERROR_EVERY_N
#undef CFATAL_EVERY_N
#undef CTRACE_EVERY_N
#undef CVERBOSE_EVERY_N
#undef CINFO_AFTER_N
#undef CWARNING_AFTER_N
#undef CDEBUG_AFTER_N
#undef CERROR_AFTER_N
#undef CFATAL_AFTER_N
#undef CTRACE_AFTER_N
#undef CVERBOSE_AFTER_N
#undef CINFO_N_TIMES
#undef CWARNING_N_TIMES
#undef CDEBUG_N_TIMES
#undef CERROR_N_TIMES
#undef CFATAL_N_TIMES
#undef CTRACE_N_TIMES
#undef CVERBOSE_N_TIMES
// Normal logs
#if ELPP_INFO_LOG
#   define CINFO(writer, dispatchAction, ...) ELPP_WRITE_LOG(writer, el::Level::Info, dispatchAction, __VA_ARGS__)
#else
#   define CINFO(writer, dispatchAction, ...) el::base::NullWriter()
#endif  // ELPP_INFO_LOG
#if ELPP_WARNING_LOG
#   define CWARNING(writer, dispatchAction, ...) ELPP_WRITE_LOG(writer, el::Level::Warning, dispatchAction, __VA_ARGS__)
#else
#   define CWARNING(writer, dispatchAction, ...) el::base::NullWriter()
#endif  // ELPP_WARNING_LOG
#if ELPP_DEBUG_LOG
#   define CDEBUG(writer, dispatchAction, ...) ELPP_WRITE_LOG(writer, el::Level::Debug, dispatchAction, __VA_ARGS__)
#else
#   define CDEBUG(writer, dispatchAction, ...) el::base::NullWriter()
#endif  // ELPP_DEBUG_LOG
#if ELPP_ERROR_LOG
#   define CERROR(writer, dispatchAction, ...) ELPP_WRITE_LOG(writer, el::Level::Error, dispatchAction, __VA_ARGS__)
#else
#   define CERROR(writer, dispatchAction, ...) el::base::NullWriter()
#endif  // ELPP_ERROR_LOG
#if ELPP_FATAL_LOG
#   define CFATAL(writer, dispatchAction, ...) ELPP_WRITE_LOG(writer, el::Level::Fatal, dispatchAction, __VA_ARGS__)
#else
#   define CFATAL(writer, dispatchAction, ...) el::base::NullWriter()
#endif  // ELPP_FATAL_LOG
#if ELPP_TRACE_LOG
#   define CTRACE(writer, dispatchAction, ...) ELPP_WRITE_LOG(writer, el::Level::Trace, dispatchAction, __VA_ARGS__)
#else
#   define CTRACE(writer, dispatchAction, ...) el::base::NullWriter()
#endif  // ELPP_TRACE_LOG
#if ELPP_VERBOSE_LOG
#   define CVERBOSE(writer, vlevel, dispatchAction, ...) if (VLOG_IS_ON(vlevel)) writer(\
el::Level::Verbose, __FILE__, __LINE__, ELPP_FUNC, dispatchAction, vlevel).construct(el_getVALength(__VA_ARGS__), __VA_ARGS__)
#else
#   define CVERBOSE(writer, vlevel, dispatchAction, ...) el::base::NullWriter()
#endif  // ELPP_VERBOSE_LOG
// Conditional logs
#if ELPP_INFO_LOG
#   define CINFO_IF(writer, condition_, dispatchAction, ...) \
ELPP_WRITE_LOG_IF(writer, (condition_), el::Level::Info, dispatchAction, __VA_ARGS__)
#else
#   define CINFO_IF(writer, condition_, dispatchAction, ...) el::base::NullWriter()
#endif  // ELPP_INFO_LOG
#if ELPP_WARNING_LOG
#   define CWARNING_IF(writer, condition_, dispatchAction, ...)\
ELPP_WRITE_LOG_IF(writer, (condition_), el::Level::Warning, dispatchAction, __VA_ARGS__)
#else
#   define CWARNING_IF(writer, condition_, dispatchAction, ...) el::base::NullWriter()
#endif  // ELPP_WARNING_LOG
#if ELPP_DEBUG_LOG
#   define CDEBUG_IF(writer, condition_, dispatchAction, ...)\
ELPP_WRITE_LOG_IF(writer, (condition_), el::Level::Debug, dispatchAction, __VA_ARGS__)
#else
#   define CDEBUG_IF(writer, condition_, dispatchAction, ...) el::base::NullWriter()
#endif  // ELPP_DEBUG_LOG
#if ELPP_ERROR_LOG
#   define CERROR_IF(writer, condition_, dispatchAction, ...)\
ELPP_WRITE_LOG_IF(writer, (condition_), el::Level::Error, dispatchAction, __VA_ARGS__)
#else
#   define CERROR_IF(writer, condition_, dispatchAction, ...) el::base::NullWriter()
#endif  // ELPP_ERROR_LOG
#if ELPP_FATAL_LOG
#   define CFATAL_IF(writer, condition_, dispatchAction, ...)\
ELPP_WRITE_LOG_IF(writer, (condition_), el::Level::Fatal, dispatchAction, __VA_ARGS__)
#else
#   define CFATAL_IF(writer, condition_, dispatchAction, ...) el::base::NullWriter()
#endif  // ELPP_FATAL_LOG
#if ELPP_TRACE_LOG
#   define CTRACE_IF(writer, condition_, dispatchAction, ...)\
ELPP_WRITE_LOG_IF(writer, (condition_), el::Level::Trace, dispatchAction, __VA_ARGS__)
#else
#   define CTRACE_IF(writer, condition_, dispatchAction, ...) el::base::NullWriter()
#endif  // ELPP_TRACE_LOG
#if ELPP_VERBOSE_LOG
#   define CVERBOSE_IF(writer, condition_, vlevel, dispatchAction, ...) if (VLOG_IS_ON(vlevel) && (condition_)) writer( \
el::Level::Verbose, __FILE__, __LINE__, ELPP_FUNC, dispatchAction, vlevel).construct(el_getVALength(__VA_ARGS__), __VA_ARGS__)
#else
#   define CVERBOSE_IF(writer, condition_, vlevel, dispatchAction, ...) el::base::NullWriter()
#endif  // ELPP_VERBOSE_LOG
// Occasional logs
#if ELPP_INFO_LOG
#   define CINFO_EVERY_N(writer, occasion, dispatchAction, ...)\
ELPP_WRITE_LOG_EVERY_N(writer, occasion, el::Level::Info, dispatchAction, __VA_ARGS__)
#else
#   define CINFO_EVERY_N(writer, occasion, dispatchAction, ...) el::base::NullWriter()
#endif  // ELPP_INFO_LOG
#if ELPP_WARNING_LOG
#   define CWARNING_EVERY_N(writer, occasion, dispatchAction, ...)\
ELPP_WRITE_LOG_EVERY_N(writer, occasion, el::Level::Warning, dispatchAction, __VA_ARGS__)
#else
#   define CWARNING_EVERY_N(writer, occasion, dispatchAction, ...) el::base::NullWriter()
#endif  // ELPP_WARNING_LOG
#if ELPP_DEBUG_LOG
#   define CDEBUG_EVERY_N(writer, occasion, dispatchAction, ...)\
ELPP_WRITE_LOG_EVERY_N(writer, occasion, el::Level::Debug, dispatchAction, __VA_ARGS__)
#else
#   define CDEBUG_EVERY_N(writer, occasion, dispatchAction, ...) el::base::NullWriter()
#endif  // ELPP_DEBUG_LOG
#if ELPP_ERROR_LOG
#   define CERROR_EVERY_N(writer, occasion, dispatchAction, ...)\
ELPP_WRITE_LOG_EVERY_N(writer, occasion, el::Level::Error, dispatchAction, __VA_ARGS__)
#else
#   define CERROR_EVERY_N(writer, occasion, dispatchAction, ...) el::base::NullWriter()
#endif  // ELPP_ERROR_LOG
#if ELPP_FATAL_LOG
#   define CFATAL_EVERY_N(writer, occasion, dispatchAction, ...)\
ELPP_WRITE_LOG_EVERY_N(writer, occasion, el::Level::Fatal, dispatchAction, __VA_ARGS__)
#else
#   define CFATAL_EVERY_N(writer, occasion, dispatchAction, ...) el::base::NullWriter()
#endif  // ELPP_FATAL_LOG
#if ELPP_TRACE_LOG
#   define CTRACE_EVERY_N(writer, occasion, dispatchAction, ...)\
ELPP_WRITE_LOG_EVERY_N(writer, occasion, el::Level::Trace, dispatchAction, __VA_ARGS__)
#else
#   define CTRACE_EVERY_N(writer, occasion, dispatchAction, ...) el::base::NullWriter()
#endif  // ELPP_TRACE_LOG
#if ELPP_VERBOSE_LOG
#   define CVERBOSE_EVERY_N(writer, occasion, vlevel, dispatchAction, ...)\
CVERBOSE_IF(writer, ELPP->validateEveryNCounter(__FILE__, __LINE__, occasion), vlevel, dispatchAction, __VA_ARGS__)
#else
#   define CVERBOSE_EVERY_N(writer, occasion, vlevel, dispatchAction, ...) el::base::NullWriter()
#endif  // ELPP_VERBOSE_LOG
// After N logs
#if ELPP_INFO_LOG
#   define CINFO_AFTER_N(writer, n, dispatchAction, ...)\
ELPP_WRITE_LOG_AFTER_N(writer, n, el::Level::Info, dispatchAction, __VA_ARGS__)
#else
#   define CINFO_AFTER_N(writer, n, dispatchAction, ...) el::base::NullWriter()
#endif  // ELPP_INFO_LOG
#if ELPP_WARNING_LOG
#   define CWARNING_AFTER_N(writer, n, dispatchAction, ...)\
ELPP_WRITE_LOG_AFTER_N(writer, n, el::Level::Warning, dispatchAction, __VA_ARGS__)
#else
#   define CWARNING_AFTER_N(writer, n, dispatchAction, ...) el::base::NullWriter()
#endif  // ELPP_WARNING_LOG
#if ELPP_DEBUG_LOG
#   define CDEBUG_AFTER_N(writer, n, dispatchAction, ...)\
ELPP_WRITE_LOG_AFTER_N(writer, n, el::Level::Debug, dispatchAction, __VA_ARGS__)
#else
#   define CDEBUG_AFTER_N(writer, n, dispatchAction, ...) el::base::NullWriter()
#endif  // ELPP_DEBUG_LOG
#if ELPP_ERROR_LOG
#   define CERROR_AFTER_N(writer, n, dispatchAction, ...)\
ELPP_WRITE_LOG_AFTER_N(writer, n, el::Level::Error, dispatchAction, __VA_ARGS__)
#else
#   define CERROR_AFTER_N(writer, n, dispatchAction, ...) el::base::NullWriter()
#endif  // ELPP_ERROR_LOG
#if ELPP_FATAL_LOG
#   define CFATAL_AFTER_N(writer, n, dispatchAction, ...)\
ELPP_WRITE_LOG_AFTER_N(writer, n, el::Level::Fatal, dispatchAction, __VA_ARGS__)
#else
#   define CFATAL_AFTER_N(writer, n, dispatchAction, ...) el::base::NullWriter()
#endif  // ELPP_FATAL_LOG
#if ELPP_TRACE_LOG
#   define CTRACE_AFTER_N(writer, n, dispatchAction, ...)\
ELPP_WRITE_LOG_AFTER_N(writer, n, el::Level::Trace, dispatchAction, __VA_ARGS__)
#else
#   define CTRACE_AFTER_N(writer, n, dispatchAction, ...) el::base::NullWriter()
#endif  // ELPP_TRACE_LOG
#if ELPP_VERBOSE_LOG
#   define CVERBOSE_AFTER_N(writer, n, vlevel, dispatchAction, ...)\
CVERBOSE_IF(writer, ELPP->validateAfterNCounter(__FILE__, __LINE__, n), vlevel, dispatchAction, __VA_ARGS__)
#else
#   define CVERBOSE_AFTER_N(writer, n, vlevel, dispatchAction, ...) el::base::NullWriter()
#endif  // ELPP_VERBOSE_LOG
// N Times logs
#if ELPP_INFO_LOG
#   define CINFO_N_TIMES(writer, n, dispatchAction, ...)\
ELPP_WRITE_LOG_N_TIMES(writer, n, el::Level::Info, dispatchAction, __VA_ARGS__)
#else
#   define CINFO_N_TIMES(writer, n, dispatchAction, ...) el::base::NullWriter()
#endif  // ELPP_INFO_LOG
#if ELPP_WARNING_LOG
#   define CWARNING_N_TIMES(writer, n, dispatchAction, ...)\
ELPP_WRITE_LOG_N_TIMES(writer, n, el::Level::Warning, dispatchAction, __VA_ARGS__)
#else
#   define CWARNING_N_TIMES(writer, n, dispatchAction, ...) el::base::NullWriter()
#endif  // ELPP_WARNING_LOG
#if ELPP_DEBUG_LOG
#   define CDEBUG_N_TIMES(writer, n, dispatchAction, ...)\
ELPP_WRITE_LOG_N_TIMES(writer, n, el::Level::Debug, dispatchAction, __VA_ARGS__)
#else
#   define CDEBUG_N_TIMES(writer, n, dispatchAction, ...) el::base::NullWriter()
#endif  // ELPP_DEBUG_LOG
#if ELPP_ERROR_LOG
#   define CERROR_N_TIMES(writer, n, dispatchAction, ...)\
ELPP_WRITE_LOG_N_TIMES(writer, n, el::Level::Error, dispatchAction, __VA_ARGS__)
#else
#   define CERROR_N_TIMES(writer, n, dispatchAction, ...) el::base::NullWriter()
#endif  // ELPP_ERROR_LOG
#if ELPP_FATAL_LOG
#   define CFATAL_N_TIMES(writer, n, dispatchAction, ...)\
ELPP_WRITE_LOG_N_TIMES(writer, n, el::Level::Fatal, dispatchAction, __VA_ARGS__)
#else
#   define CFATAL_N_TIMES(writer, n, dispatchAction, ...) el::base::NullWriter()
#endif  // ELPP_FATAL_LOG
#if ELPP_TRACE_LOG
#   define CTRACE_N_TIMES(writer, n, dispatchAction, ...)\
ELPP_WRITE_LOG_N_TIMES(writer, n, el::Level::Trace, dispatchAction, __VA_ARGS__)
#else
#   define CTRACE_N_TIMES(writer, n, dispatchAction, ...) el::base::NullWriter()
#endif  // ELPP_TRACE_LOG
#if ELPP_VERBOSE_LOG
#   define CVERBOSE_N_TIMES(writer, n, vlevel, dispatchAction, ...)\
CVERBOSE_IF(writer, ELPP->validateNTimesCounter(__FILE__, __LINE__, n), vlevel, dispatchAction, __VA_ARGS__)
#else
#   define CVERBOSE_N_TIMES(writer, n, vlevel, dispatchAction, ...) el::base::NullWriter()
#endif  // ELPP_VERBOSE_LOG
//
// Custom Loggers - Requires (level, dispatchAction, loggerId/s)
//
// undef existing
#undef CLOG
#undef CLOG_VERBOSE
#undef CVLOG
#undef CLOG_IF
#undef CLOG_VERBOSE_IF
#undef CVLOG_IF
#undef CLOG_EVERY_N
#undef CVLOG_EVERY_N
#undef CLOG_AFTER_N
#undef CVLOG_AFTER_N
#undef CLOG_N_TIMES
#undef CVLOG_N_TIMES
// Normal logs
#define CLOG(LEVEL, ...)\
C##LEVEL(el::base::Writer, el::base::DispatchAction::NormalLog, __VA_ARGS__)
#define CVLOG(vlevel, ...) CVERBOSE(el::base::Writer, vlevel, el::base::DispatchAction::NormalLog, __VA_ARGS__)
// Conditional logs
#define CLOG_IF(condition, LEVEL, ...)\
C##LEVEL##_IF(el::base::Writer, condition, el::base::DispatchAction::NormalLog, __VA_ARGS__)
#define CVLOG_IF(condition, vlevel, ...)\
CVERBOSE_IF(el::base::Writer, condition, vlevel, el::base::DispatchAction::NormalLog, __VA_ARGS__)
// Hit counts based logs
#define CLOG_EVERY_N(n, LEVEL, ...)\
C##LEVEL##_EVERY_N(el::base::Writer, n, el::base::DispatchAction::NormalLog, __VA_ARGS__)
#define CVLOG_EVERY_N(n, vlevel, ...)\
CVERBOSE_EVERY_N(el::base::Writer, n, vlevel, el::base::DispatchAction::NormalLog, __VA_ARGS__)
#define CLOG_AFTER_N(n, LEVEL, ...)\
C##LEVEL##_AFTER_N(el::base::Writer, n, el::base::DispatchAction::NormalLog, __VA_ARGS__)
#define CVLOG_AFTER_N(n, vlevel, ...)\
CVERBOSE_AFTER_N(el::base::Writer, n, vlevel, el::base::DispatchAction::NormalLog, __VA_ARGS__)
#define CLOG_N_TIMES(n, LEVEL, ...)\
C##LEVEL##_N_TIMES(el::base::Writer, n, el::base::DispatchAction::NormalLog, __VA_ARGS__)
#define CVLOG_N_TIMES(n, vlevel, ...)\
CVERBOSE_N_TIMES(el::base::Writer, n, vlevel, el::base::DispatchAction::NormalLog, __VA_ARGS__)
//
// Default Loggers macro using CLOG(), CLOG_VERBOSE() and CVLOG() macros
//
// undef existing
#undef LOG
#undef VLOG
#undef LOG_IF
#undef VLOG_IF
#undef LOG_EVERY_N
#undef VLOG_EVERY_N
#undef LOG_AFTER_N
#undef VLOG_AFTER_N
#undef LOG_N_TIMES
#undef VLOG_N_TIMES
#undef ELPP_CURR_FILE_LOGGER_ID
#if defined(ELPP_DEFAULT_LOGGER)
#   define ELPP_CURR_FILE_LOGGER_ID ELPP_DEFAULT_LOGGER
#else
#   define ELPP_CURR_FILE_LOGGER_ID el::base::consts::kDefaultLoggerId
#endif
#undef ELPP_TRACE
#define ELPP_TRACE CLOG(TRACE, ELPP_CURR_FILE_LOGGER_ID)
// Normal logs
#define LOG(LEVEL) CLOG(LEVEL, ELPP_CURR_FILE_LOGGER_ID)
#define VLOG(vlevel) CVLOG(vlevel, ELPP_CURR_FILE_LOGGER_ID)
// Conditional logs
#define LOG_IF(condition, LEVEL) CLOG_IF(condition, LEVEL, ELPP_CURR_FILE_LOGGER_ID)
#define VLOG_IF(condition, vlevel) CVLOG_IF(condition, vlevel, ELPP_CURR_FILE_LOGGER_ID)
// Hit counts based logs
#define LOG_EVERY_N(n, LEVEL) CLOG_EVERY_N(n, LEVEL, ELPP_CURR_FILE_LOGGER_ID)
#define VLOG_EVERY_N(n, vlevel) CVLOG_EVERY_N(n, vlevel, ELPP_CURR_FILE_LOGGER_ID)
#define LOG_AFTER_N(n, LEVEL) CLOG_AFTER_N(n, LEVEL, ELPP_CURR_FILE_LOGGER_ID)
#define VLOG_AFTER_N(n, vlevel) CVLOG_AFTER_N(n, vlevel, ELPP_CURR_FILE_LOGGER_ID)
#define LOG_N_TIMES(n, LEVEL) CLOG_N_TIMES(n, LEVEL, ELPP_CURR_FILE_LOGGER_ID)
#define VLOG_N_TIMES(n, vlevel) CVLOG_N_TIMES(n, vlevel, ELPP_CURR_FILE_LOGGER_ID)
// Generic PLOG()
#undef CPLOG
#undef CPLOG_IF
#undef PLOG
#undef PLOG_IF
#undef DCPLOG
#undef DCPLOG_IF
#undef DPLOG
#undef DPLOG_IF
#define CPLOG(LEVEL, ...)\
C##LEVEL(el::base::PErrorWriter, el::base::DispatchAction::NormalLog, __VA_ARGS__)
#define CPLOG_IF(condition, LEVEL, ...)\
C##LEVEL##_IF(el::base::PErrorWriter, condition, el::base::DispatchAction::NormalLog, __VA_ARGS__)
#define DCPLOG(LEVEL, ...)\
if (ELPP_DEBUG_LOG) C##LEVEL(el::base::PErrorWriter, el::base::DispatchAction::NormalLog, __VA_ARGS__)
#define DCPLOG_IF(condition, LEVEL, ...)\
C##LEVEL##_IF(el::base::PErrorWriter, (ELPP_DEBUG_LOG) && (condition), el::base::DispatchAction::NormalLog, __VA_ARGS__)
#define PLOG(LEVEL) CPLOG(LEVEL, ELPP_CURR_FILE_LOGGER_ID)
#define PLOG_IF(condition, LEVEL) CPLOG_IF(condition, LEVEL, ELPP_CURR_FILE_LOGGER_ID)
#define DPLOG(LEVEL) DCPLOG(LEVEL, ELPP_CURR_FILE_LOGGER_ID)
#define DPLOG_IF(condition, LEVEL) DCPLOG_IF(condition, LEVEL, ELPP_CURR_FILE_LOGGER_ID)
// Generic SYSLOG()
#undef CSYSLOG
#undef CSYSLOG_IF
#undef CSYSLOG_EVERY_N
#undef CSYSLOG_AFTER_N
#undef CSYSLOG_N_TIMES
#undef SYSLOG
#undef SYSLOG_IF
#undef SYSLOG_EVERY_N
#undef SYSLOG_AFTER_N
#undef SYSLOG_N_TIMES
#undef DCSYSLOG
#undef DCSYSLOG_IF
#undef DCSYSLOG_EVERY_N
#undef DCSYSLOG_AFTER_N
#undef DCSYSLOG_N_TIMES
#undef DSYSLOG
#undef DSYSLOG_IF
#undef DSYSLOG_EVERY_N
#undef DSYSLOG_AFTER_N
#undef DSYSLOG_N_TIMES
#if defined(ELPP_SYSLOG)
#   define CSYSLOG(LEVEL, ...)\
C##LEVEL(el::base::Writer, el::base::DispatchAction::SysLog, __VA_ARGS__)
#   define CSYSLOG_IF(condition, LEVEL, ...)\
C##LEVEL##_IF(el::base::Writer, condition, el::base::DispatchAction::SysLog, __VA_ARGS__)
#   define CSYSLOG_EVERY_N(n, LEVEL, ...) C##LEVEL##_EVERY_N(el::base::Writer, n, el::base::DispatchAction::SysLog, __VA_ARGS__)
#   define CSYSLOG_AFTER_N(n, LEVEL, ...) C##LEVEL##_AFTER_N(el::base::Writer, n, el::base::DispatchAction::SysLog, __VA_ARGS__)
#   define CSYSLOG_N_TIMES(n, LEVEL, ...) C##LEVEL##_N_TIMES(el::base::Writer, n, el::base::DispatchAction::SysLog, __VA_ARGS__)
#   define SYSLOG(LEVEL) CSYSLOG(LEVEL, el::base::consts::kSysLogLoggerId)
#   define SYSLOG_IF(condition, LEVEL) CSYSLOG_IF(condition, LEVEL, el::base::consts::kSysLogLoggerId)
#   define SYSLOG_EVERY_N(n, LEVEL) CSYSLOG_EVERY_N(n, LEVEL, el::base::consts::kSysLogLoggerId)
#   define SYSLOG_AFTER_N(n, LEVEL) CSYSLOG_AFTER_N(n, LEVEL, el::base::consts::kSysLogLoggerId)
#   define SYSLOG_N_TIMES(n, LEVEL) CSYSLOG_N_TIMES(n, LEVEL, el::base::consts::kSysLogLoggerId)
#   define DCSYSLOG(LEVEL, ...) if (ELPP_DEBUG_LOG) C##LEVEL(el::base::Writer, el::base::DispatchAction::SysLog, __VA_ARGS__)
#   define DCSYSLOG_IF(condition, LEVEL, ...)\
C##LEVEL##_IF(el::base::Writer, (ELPP_DEBUG_LOG) && (condition), el::base::DispatchAction::SysLog, __VA_ARGS__)
#   define DCSYSLOG_EVERY_N(n, LEVEL, ...)\
if (ELPP_DEBUG_LOG) C##LEVEL##_EVERY_N(el::base::Writer, n, el::base::DispatchAction::SysLog, __VA_ARGS__)
#   define DCSYSLOG_AFTER_N(n, LEVEL, ...)\
if (ELPP_DEBUG_LOG) C##LEVEL##_AFTER_N(el::base::Writer, n, el::base::DispatchAction::SysLog, __VA_ARGS__)
#   define DCSYSLOG_N_TIMES(n, LEVEL, ...)\
if (ELPP_DEBUG_LOG) C##LEVEL##_EVERY_N(el::base::Writer, n, el::base::DispatchAction::SysLog, __VA_ARGS__)
#   define DSYSLOG(LEVEL) DCSYSLOG(LEVEL, el::base::consts::kSysLogLoggerId)
#   define DSYSLOG_IF(condition, LEVEL) DCSYSLOG_IF(condition, LEVEL, el::base::consts::kSysLogLoggerId)
#   define DSYSLOG_EVERY_N(n, LEVEL) DCSYSLOG_EVERY_N(n, LEVEL, el::base::consts::kSysLogLoggerId)
#   define DSYSLOG_AFTER_N(n, LEVEL) DCSYSLOG_AFTER_N(n, LEVEL, el::base::consts::kSysLogLoggerId)
#   define DSYSLOG_N_TIMES(n, LEVEL) DCSYSLOG_N_TIMES(n, LEVEL, el::base::consts::kSysLogLoggerId)
#else
#   define CSYSLOG(LEVEL, ...) el::base::NullWriter()
#   define CSYSLOG_IF(condition, LEVEL, ...) el::base::NullWriter()
#   define CSYSLOG_EVERY_N(n, LEVEL, ...) el::base::NullWriter()
#   define CSYSLOG_AFTER_N(n, LEVEL, ...) el::base::NullWriter()
#   define CSYSLOG_N_TIMES(n, LEVEL, ...) el::base::NullWriter()
#   define SYSLOG(LEVEL) el::base::NullWriter()
#   define SYSLOG_IF(condition, LEVEL) el::base::NullWriter()
#   define SYSLOG_EVERY_N(n, LEVEL) el::base::NullWriter()
#   define SYSLOG_AFTER_N(n, LEVEL) el::base::NullWriter()
#   define SYSLOG_N_TIMES(n, LEVEL) el::base::NullWriter()
#   define DCSYSLOG(LEVEL, ...) el::base::NullWriter()
#   define DCSYSLOG_IF(condition, LEVEL, ...) el::base::NullWriter()
#   define DCSYSLOG_EVERY_N(n, LEVEL, ...) el::base::NullWriter()
#   define DCSYSLOG_AFTER_N(n, LEVEL, ...) el::base::NullWriter()
#   define DCSYSLOG_N_TIMES(n, LEVEL, ...) el::base::NullWriter()
#   define DSYSLOG(LEVEL) el::base::NullWriter()
#   define DSYSLOG_IF(condition, LEVEL) el::base::NullWriter()
#   define DSYSLOG_EVERY_N(n, LEVEL) el::base::NullWriter()
#   define DSYSLOG_AFTER_N(n, LEVEL) el::base::NullWriter()
#   define DSYSLOG_N_TIMES(n, LEVEL) el::base::NullWriter()
#endif  // defined(ELPP_SYSLOG)
//
// Custom Debug Only Loggers - Requires (level, loggerId/s)
//
// undef existing
#undef DCLOG
#undef DCVLOG
#undef DCLOG_IF
#undef DCVLOG_IF
#undef DCLOG_EVERY_N
#undef DCVLOG_EVERY_N
#undef DCLOG_AFTER_N
#undef DCVLOG_AFTER_N
#undef DCLOG_N_TIMES
#undef DCVLOG_N_TIMES
// Normal logs
#define DCLOG(LEVEL, ...) if (ELPP_DEBUG_LOG) CLOG(LEVEL, __VA_ARGS__)
#define DCLOG_VERBOSE(vlevel, ...) if (ELPP_DEBUG_LOG) CLOG_VERBOSE(vlevel, __VA_ARGS__)
#define DCVLOG(vlevel, ...) if (ELPP_DEBUG_LOG) CVLOG(vlevel, __VA_ARGS__)
// Conditional logs
#define DCLOG_IF(condition, LEVEL, ...) if (ELPP_DEBUG_LOG) CLOG_IF(condition, LEVEL, __VA_ARGS__)
#define DCVLOG_IF(condition, vlevel, ...) if (ELPP_DEBUG_LOG) CVLOG_IF(condition, vlevel, __VA_ARGS__)
// Hit counts based logs
#define DCLOG_EVERY_N(n, LEVEL, ...) if (ELPP_DEBUG_LOG) CLOG_EVERY_N(n, LEVEL, __VA_ARGS__)
#define DCVLOG_EVERY_N(n, vlevel, ...) if (ELPP_DEBUG_LOG) CVLOG_EVERY_N(n, vlevel, __VA_ARGS__)
#define DCLOG_AFTER_N(n, LEVEL, ...) if (ELPP_DEBUG_LOG) CLOG_AFTER_N(n, LEVEL, __VA_ARGS__)
#define DCVLOG_AFTER_N(n, vlevel, ...) if (ELPP_DEBUG_LOG) CVLOG_AFTER_N(n, vlevel, __VA_ARGS__)
#define DCLOG_N_TIMES(n, LEVEL, ...) if (ELPP_DEBUG_LOG) CLOG_N_TIMES(n, LEVEL, __VA_ARGS__)
#define DCVLOG_N_TIMES(n, vlevel, ...) if (ELPP_DEBUG_LOG) CVLOG_N_TIMES(n, vlevel, __VA_ARGS__)
//
// Default Debug Only Loggers macro using CLOG(), CLOG_VERBOSE() and CVLOG() macros
//
// undef existing
#undef DLOG
#undef DVLOG
#undef DLOG_IF
#undef DVLOG_IF
#undef DLOG_EVERY_N
#undef DVLOG_EVERY_N
#undef DLOG_AFTER_N
#undef DVLOG_AFTER_N
#undef DLOG_N_TIMES
#undef DVLOG_N_TIMES
// Normal logs
#define DLOG(LEVEL) DCLOG(LEVEL, ELPP_CURR_FILE_LOGGER_ID)
#define DVLOG(vlevel) DCVLOG(vlevel, ELPP_CURR_FILE_LOGGER_ID)
// Conditional logs
#define DLOG_IF(condition, LEVEL) DCLOG_IF(condition, LEVEL, ELPP_CURR_FILE_LOGGER_ID)
#define DVLOG_IF(condition, vlevel) DCVLOG_IF(condition, vlevel, ELPP_CURR_FILE_LOGGER_ID)
// Hit counts based logs
#define DLOG_EVERY_N(n, LEVEL) DCLOG_EVERY_N(n, LEVEL, ELPP_CURR_FILE_LOGGER_ID)
#define DVLOG_EVERY_N(n, vlevel) DCVLOG_EVERY_N(n, vlevel, ELPP_CURR_FILE_LOGGER_ID)
#define DLOG_AFTER_N(n, LEVEL) DCLOG_AFTER_N(n, LEVEL, ELPP_CURR_FILE_LOGGER_ID)
#define DVLOG_AFTER_N(n, vlevel) DCVLOG_AFTER_N(n, vlevel, ELPP_CURR_FILE_LOGGER_ID)
#define DLOG_N_TIMES(n, LEVEL) DCLOG_N_TIMES(n, LEVEL, ELPP_CURR_FILE_LOGGER_ID)
#define DVLOG_N_TIMES(n, vlevel) DCVLOG_N_TIMES(n, vlevel, ELPP_CURR_FILE_LOGGER_ID)
// Check macros
#undef CCHECK
#undef CPCHECK
#undef CCHECK_EQ
#undef CCHECK_NE
#undef CCHECK_LT
#undef CCHECK_GT
#undef CCHECK_LE
#undef CCHECK_GE
#undef CCHECK_BOUNDS
#undef CCHECK_NOTNULL
#undef CCHECK_STRCASEEQ
#undef CCHECK_STRCASENE
#undef CHECK
#undef PCHECK
#undef CHECK_EQ
#undef CHECK_NE
#undef CHECK_LT
#undef CHECK_GT
#undef CHECK_LE
#undef CHECK_GE
#undef CHECK_BOUNDS
#undef CHECK_NOTNULL
#undef CHECK_STRCASEEQ
#undef CHECK_STRCASENE
#define CCHECK(condition, ...) CLOG_IF(!(condition), FATAL, __VA_ARGS__) << "Check failed: [" << #condition << "] "
#define CPCHECK(condition, ...) CPLOG_IF(!(condition), FATAL, __VA_ARGS__) << "Check failed: [" << #condition << "] "
#define CHECK(condition) CCHECK(condition, ELPP_CURR_FILE_LOGGER_ID)
#define PCHECK(condition) CPCHECK(condition, ELPP_CURR_FILE_LOGGER_ID)
#define CCHECK_EQ(a, b, ...) CCHECK(a == b, __VA_ARGS__)
#define CCHECK_NE(a, b, ...) CCHECK(a != b, __VA_ARGS__)
#define CCHECK_LT(a, b, ...) CCHECK(a < b, __VA_ARGS__)
#define CCHECK_GT(a, b, ...) CCHECK(a > b, __VA_ARGS__)
#define CCHECK_LE(a, b, ...) CCHECK(a <= b, __VA_ARGS__)
#define CCHECK_GE(a, b, ...) CCHECK(a >= b, __VA_ARGS__)
#define CCHECK_BOUNDS(val, min, max, ...) CCHECK(val >= min && val <= max, __VA_ARGS__)
#define CHECK_EQ(a, b) CCHECK_EQ(a, b, ELPP_CURR_FILE_LOGGER_ID)
#define CHECK_NE(a, b) CCHECK_NE(a, b, ELPP_CURR_FILE_LOGGER_ID)
#define CHECK_LT(a, b) CCHECK_LT(a, b, ELPP_CURR_FILE_LOGGER_ID)
#define CHECK_GT(a, b) CCHECK_GT(a, b, ELPP_CURR_FILE_LOGGER_ID)
#define CHECK_LE(a, b) CCHECK_LE(a, b, ELPP_CURR_FILE_LOGGER_ID)
#define CHECK_GE(a, b) CCHECK_GE(a, b, ELPP_CURR_FILE_LOGGER_ID)
#define CHECK_BOUNDS(val, min, max) CCHECK_BOUNDS(val, min, max, ELPP_CURR_FILE_LOGGER_ID)
#define CCHECK_NOTNULL(ptr, ...) CCHECK((ptr) != nullptr, __VA_ARGS__)
#define CCHECK_STREQ(str1, str2, ...) CLOG_IF(!el::base::utils::Str::cStringEq(str1, str2), FATAL, __VA_ARGS__) \
<< "Check failed: [" << #str1 << " == " << #str2 << "] "
#define CCHECK_STRNE(str1, str2, ...) CLOG_IF(el::base::utils::Str::cStringEq(str1, str2), FATAL, __VA_ARGS__) \
<< "Check failed: [" << #str1 << " != " << #str2 << "] "
#define CCHECK_STRCASEEQ(str1, str2, ...) CLOG_IF(!el::base::utils::Str::cStringCaseEq(str1, str2), FATAL, __VA_ARGS__) \
<< "Check failed: [" << #str1 << " == " << #str2 << "] "
#define CCHECK_STRCASENE(str1, str2, ...) CLOG_IF(el::base::utils::Str::cStringCaseEq(str1, str2), FATAL, __VA_ARGS__) \
<< "Check failed: [" << #str1 << " != " << #str2 << "] "
#define CHECK_NOTNULL(ptr) CCHECK_NOTNULL((ptr), ELPP_CURR_FILE_LOGGER_ID)
#define CHECK_STREQ(str1, str2) CCHECK_STREQ(str1, str2, ELPP_CURR_FILE_LOGGER_ID)
#define CHECK_STRNE(str1, str2) CCHECK_STRNE(str1, str2, ELPP_CURR_FILE_LOGGER_ID)
#define CHECK_STRCASEEQ(str1, str2) CCHECK_STRCASEEQ(str1, str2, ELPP_CURR_FILE_LOGGER_ID)
#define CHECK_STRCASENE(str1, str2) CCHECK_STRCASENE(str1, str2, ELPP_CURR_FILE_LOGGER_ID)
#undef DCCHECK
#undef DCCHECK_EQ
#undef DCCHECK_NE
#undef DCCHECK_LT
#undef DCCHECK_GT
#undef DCCHECK_LE
#undef DCCHECK_GE
#undef DCCHECK_BOUNDS
#undef DCCHECK_NOTNULL
#undef DCCHECK_STRCASEEQ
#undef DCCHECK_STRCASENE
#undef DCPCHECK
#undef DCHECK
#undef DCHECK_EQ
#undef DCHECK_NE
#undef DCHECK_LT
#undef DCHECK_GT
#undef DCHECK_LE
#undef DCHECK_GE
#undef DCHECK_BOUNDS_
#undef DCHECK_NOTNULL
#undef DCHECK_STRCASEEQ
#undef DCHECK_STRCASENE
#undef DPCHECK
#define DCCHECK(condition, ...) if (ELPP_DEBUG_LOG) CCHECK(condition, __VA_ARGS__)
#define DCCHECK_EQ(a, b, ...) if (ELPP_DEBUG_LOG) CCHECK_EQ(a, b, __VA_ARGS__)
#define DCCHECK_NE(a, b, ...) if (ELPP_DEBUG_LOG) CCHECK_NE(a, b, __VA_ARGS__)
#define DCCHECK_LT(a, b, ...) if (ELPP_DEBUG_LOG) CCHECK_LT(a, b, __VA_ARGS__)
#define DCCHECK_GT(a, b, ...) if (ELPP_DEBUG_LOG) CCHECK_GT(a, b, __VA_ARGS__)
#define DCCHECK_LE(a, b, ...) if (ELPP_DEBUG_LOG) CCHECK_LE(a, b, __VA_ARGS__)
#define DCCHECK_GE(a, b, ...) if (ELPP_DEBUG_LOG) CCHECK_GE(a, b, __VA_ARGS__)
#define DCCHECK_BOUNDS(val, min, max, ...) if (ELPP_DEBUG_LOG) CCHECK_BOUNDS(val, min, max, __VA_ARGS__)
#define DCCHECK_NOTNULL(ptr, ...) if (ELPP_DEBUG_LOG) CCHECK_NOTNULL((ptr), __VA_ARGS__)
#define DCCHECK_STREQ(str1, str2, ...) if (ELPP_DEBUG_LOG) CCHECK_STREQ(str1, str2, __VA_ARGS__)
#define DCCHECK_STRNE(str1, str2, ...) if (ELPP_DEBUG_LOG) CCHECK_STRNE(str1, str2, __VA_ARGS__)
#define DCCHECK_STRCASEEQ(str1, str2, ...) if (ELPP_DEBUG_LOG) CCHECK_STRCASEEQ(str1, str2, __VA_ARGS__)
#define DCCHECK_STRCASENE(str1, str2, ...) if (ELPP_DEBUG_LOG) CCHECK_STRCASENE(str1, str2, __VA_ARGS__)
#define DCPCHECK(condition, ...) if (ELPP_DEBUG_LOG) CPCHECK(condition, __VA_ARGS__)
#define DCHECK(condition) DCCHECK(condition, ELPP_CURR_FILE_LOGGER_ID)
#define DCHECK_EQ(a, b) DCCHECK_EQ(a, b, ELPP_CURR_FILE_LOGGER_ID)
#define DCHECK_NE(a, b) DCCHECK_NE(a, b, ELPP_CURR_FILE_LOGGER_ID)
#define DCHECK_LT(a, b) DCCHECK_LT(a, b, ELPP_CURR_FILE_LOGGER_ID)
#define DCHECK_GT(a, b) DCCHECK_GT(a, b, ELPP_CURR_FILE_LOGGER_ID)
#define DCHECK_LE(a, b) DCCHECK_LE(a, b, ELPP_CURR_FILE_LOGGER_ID)
#define DCHECK_GE(a, b) DCCHECK_GE(a, b, ELPP_CURR_FILE_LOGGER_ID)
#define DCHECK_BOUNDS(val, min, max) DCCHECK_BOUNDS(val, min, max, ELPP_CURR_FILE_LOGGER_ID)
#define DCHECK_NOTNULL(ptr) DCCHECK_NOTNULL((ptr), ELPP_CURR_FILE_LOGGER_ID)
#define DCHECK_STREQ(str1, str2) DCCHECK_STREQ(str1, str2, ELPP_CURR_FILE_LOGGER_ID)
#define DCHECK_STRNE(str1, str2) DCCHECK_STRNE(str1, str2, ELPP_CURR_FILE_LOGGER_ID)
#define DCHECK_STRCASEEQ(str1, str2) DCCHECK_STRCASEEQ(str1, str2, ELPP_CURR_FILE_LOGGER_ID)
#define DCHECK_STRCASENE(str1, str2) DCCHECK_STRCASENE(str1, str2, ELPP_CURR_FILE_LOGGER_ID)
#define DPCHECK(condition) DCPCHECK(condition, ELPP_CURR_FILE_LOGGER_ID)
#if defined(ELPP_DISABLE_DEFAULT_CRASH_HANDLING)
#   define ELPP_USE_DEF_CRASH_HANDLER false
#else
#   define ELPP_USE_DEF_CRASH_HANDLER true
#endif  // defined(ELPP_DISABLE_DEFAULT_CRASH_HANDLING)
#define ELPP_CRASH_HANDLER_INIT
#define ELPP_INIT_EASYLOGGINGPP(val) \
ELPP_INITI_BASIC_DECLR \
namespace el { \
namespace base { \
el::base::type::StoragePointer elStorage(val); \
} \
el::base::debug::CrashHandler elCrashHandler(ELPP_USE_DEF_CRASH_HANDLER); \
}

#if ELPP_ASYNC_LOGGING
#   define INITIALIZE_EASYLOGGINGPP\
ELPP_INIT_EASYLOGGINGPP(new el::base::Storage(el::LogBuilderPtr(new el::base::DefaultLogBuilder()),\
new el::base::AsyncDispatchWorker()))\

#else
#   define INITIALIZE_EASYLOGGINGPP ELPP_INIT_EASYLOGGINGPP(new el::base::Storage(el::LogBuilderPtr(new el::base::DefaultLogBuilder())))
#endif  // ELPP_ASYNC_LOGGING
#define INITIALIZE_NULL_EASYLOGGINGPP\
ELPP_INITI_BASIC_DECLR\
namespace el {\
namespace base {\
el::base::type::StoragePointer elStorage;\
}\
el::base::debug::CrashHandler elCrashHandler(ELPP_USE_DEF_CRASH_HANDLER);\
}
// NOTE: no ELPP_INITI_BASIC_DECLR when sharing - causes double free corruption on external symbols
#define SHARE_EASYLOGGINGPP(initializedStorage)\
namespace el {\
namespace base {\
el::base::type::StoragePointer elStorage(initializedStorage);\
}\
el::base::debug::CrashHandler elCrashHandler(ELPP_USE_DEF_CRASH_HANDLER);\
}

#if defined(ELPP_UNICODE)
#   define START_EASYLOGGINGPP(argc, argv) el::Helpers::setArgs(argc, argv); std::locale::global(std::locale(""))
#else
#   define START_EASYLOGGINGPP(argc, argv) el::Helpers::setArgs(argc, argv)
#endif  // defined(ELPP_UNICODE)
#endif // EASYLOGGINGPP_H