remove "using namespace std" from headers

It's nasty, and actually breaks on Solaris, where if.h fails to
build due to:

  struct map *if_memmap;

4 files changed, 5 insertions, 4 deletions

diff --git a/tests/core_proxy/core_proxy.cpp b/tests/core_proxy/core_proxy.cpp
index 0dc314b49..2c8f92d1f 100644
--- a/tests/core_proxy/core_proxy.cpp
+++ b/tests/core_proxy/core_proxy.cpp
@@ -34,12 +34,8 @@
 
 #include "include_base_utils.h"
 #include "version.h"
-
-using namespace epee;
-
 #include <iostream>
 #include <sstream>
-using namespace std;
 
 #include <boost/program_options.hpp>
 
@@ -56,6 +52,8 @@ using namespace std;
 #endif
 
 namespace po = boost::program_options;
+using namespace std;
+using namespace epee;
 using namespace cryptonote;
 using namespace crypto;
 
diff --git a/tests/core_tests/chaingen.cpp b/tests/core_tests/chaingen.cpp
index 2b713cab9..4c5dc6c9a 100644
--- a/tests/core_tests/chaingen.cpp
+++ b/tests/core_tests/chaingen.cpp
@@ -47,6 +47,7 @@
 using namespace std;
 
 using namespace epee;
+using namespace crypto;
 using namespace cryptonote;
 
 
diff --git a/tests/unit_tests/ringct.cpp b/tests/unit_tests/ringct.cpp
index af6afa636..ef6151efb 100644
--- a/tests/unit_tests/ringct.cpp
+++ b/tests/unit_tests/ringct.cpp
@@ -38,6 +38,7 @@
 #include "ringct/rctSigs.h"
 #include "ringct/rctOps.h"
 
+using namespace std;
 using namespace crypto;
 using namespace rct;
 
diff --git a/tests/unit_tests/serialization.cpp b/tests/unit_tests/serialization.cpp
index 011082d1c..0750ab7d1 100644
--- a/tests/unit_tests/serialization.cpp
+++ b/tests/unit_tests/serialization.cpp
@@ -49,6 +49,7 @@
 #include "gtest/gtest.h"
 #include "unit_tests_utils.h"
 using namespace std;
+using namespace crypto;
 
 struct Struct
 {