3 files changed, 10 insertions, 10 deletions
diff --git a/contrib/epee/include/net/abstract_tcp_server2.h b/contrib/epee/include/net/abstract_tcp_server2.h
index c0401c8b0..ccde928ba 100644
--- a/contrib/epee/include/net/abstract_tcp_server2.h
+++ b/contrib/epee/include/net/abstract_tcp_server2.h
@@ -207,7 +207,7 @@ namespace net_utils
 
     bool connect(const std::string& adr, const std::string& port, uint32_t conn_timeot, t_connection_context& cn, const std::string& bind_ip = "0.0.0.0");
     template<class t_callback>
-    bool connect_async(const std::string& adr, const std::string& port, uint32_t conn_timeot, t_callback cb, const std::string& bind_ip = "0.0.0.0");
+    bool connect_async(const std::string& adr, const std::string& port, uint32_t conn_timeot, const t_callback &cb, const std::string& bind_ip = "0.0.0.0");
 
     typename t_protocol_handler::config_type& get_config_object(){return m_config;}
 
diff --git a/contrib/epee/include/net/abstract_tcp_server2.inl b/contrib/epee/include/net/abstract_tcp_server2.inl
index 5a886688b..195ee2f0c 100644
--- a/contrib/epee/include/net/abstract_tcp_server2.inl
+++ b/contrib/epee/include/net/abstract_tcp_server2.inl
@@ -1058,7 +1058,7 @@ POP_WARNINGS
   }
   //---------------------------------------------------------------------------------
   template<class t_protocol_handler> template<class t_callback>
-  bool boosted_tcp_server<t_protocol_handler>::connect_async(const std::string& adr, const std::string& port, uint32_t conn_timeout, t_callback cb, const std::string& bind_ip)
+  bool boosted_tcp_server<t_protocol_handler>::connect_async(const std::string& adr, const std::string& port, uint32_t conn_timeout, const t_callback &cb, const std::string& bind_ip)
   {
     TRY_ENTRY();    
     connection_ptr new_connection_l(new connection<t_protocol_handler>(io_service_, m_config, m_sock_count, m_sock_number, m_pfilter, m_connection_type) );
diff --git a/contrib/epee/include/net/levin_protocol_handler_async.h b/contrib/epee/include/net/levin_protocol_handler_async.h
index de270bfd0..0b1fe05fa 100644
--- a/contrib/epee/include/net/levin_protocol_handler_async.h
+++ b/contrib/epee/include/net/levin_protocol_handler_async.h
@@ -86,16 +86,16 @@ public:
 
   int invoke(int command, const std::string& in_buff, std::string& buff_out, boost::uuids::uuid connection_id);
   template<class callback_t>
-  int invoke_async(int command, const std::string& in_buff, boost::uuids::uuid connection_id, callback_t cb, size_t timeout = LEVIN_DEFAULT_TIMEOUT_PRECONFIGURED);
+  int invoke_async(int command, const std::string& in_buff, boost::uuids::uuid connection_id, const callback_t &cb, size_t timeout = LEVIN_DEFAULT_TIMEOUT_PRECONFIGURED);
 
   int notify(int command, const std::string& in_buff, boost::uuids::uuid connection_id);
   bool close(boost::uuids::uuid connection_id);
   bool update_connection_context(const t_connection_context& contxt);
   bool request_callback(boost::uuids::uuid connection_id);
   template<class callback_t>
-  bool foreach_connection(callback_t cb);
+  bool foreach_connection(const callback_t &cb);
   template<class callback_t>
-  bool for_connection(const boost::uuids::uuid &connection_id, callback_t cb);
+  bool for_connection(const boost::uuids::uuid &connection_id, const callback_t &cb);
   size_t get_connections_count();
   void set_handler(levin_commands_handler<t_connection_context>* handler, void (*destroy)(levin_commands_handler<t_connection_context>*) = NULL);
 
@@ -248,7 +248,7 @@ public:
   std::list<boost::shared_ptr<invoke_response_handler_base> > m_invoke_response_handlers;
   
   template<class callback_t>
-  bool add_invoke_response_handler(callback_t cb, uint64_t timeout,  async_protocol_handler& con, int command)
+  bool add_invoke_response_handler(const callback_t &cb, uint64_t timeout,  async_protocol_handler& con, int command)
   {
     CRITICAL_REGION_LOCAL(m_invoke_response_handlers_lock);
     boost::shared_ptr<invoke_response_handler_base> handler(boost::make_shared<anvoke_handler<callback_t>>(cb, timeout, con, command));
@@ -532,7 +532,7 @@ public:
   }
 
   template<class callback_t>
-  bool async_invoke(int command, const std::string& in_buff, callback_t cb, size_t timeout = LEVIN_DEFAULT_TIMEOUT_PRECONFIGURED)
+  bool async_invoke(int command, const std::string& in_buff, const callback_t &cb, size_t timeout = LEVIN_DEFAULT_TIMEOUT_PRECONFIGURED)
   {
     misc_utils::auto_scope_leave_caller scope_exit_handler = misc_utils::create_scope_leave_handler(
       boost::bind(&async_protocol_handler::finish_outer_call, this));
@@ -817,7 +817,7 @@ int async_protocol_handler_config<t_connection_context>::invoke(int command, con
 }
 //------------------------------------------------------------------------------------------
 template<class t_connection_context> template<class callback_t>
-int async_protocol_handler_config<t_connection_context>::invoke_async(int command, const std::string& in_buff, boost::uuids::uuid connection_id, callback_t cb, size_t timeout)
+int async_protocol_handler_config<t_connection_context>::invoke_async(int command, const std::string& in_buff, boost::uuids::uuid connection_id, const callback_t &cb, size_t timeout)
 {
   async_protocol_handler<t_connection_context>* aph;
   int r = find_and_lock_connection(connection_id, aph);
@@ -825,7 +825,7 @@ int async_protocol_handler_config<t_connection_context>::invoke_async(int comman
 }
 //------------------------------------------------------------------------------------------
 template<class t_connection_context> template<class callback_t>
-bool async_protocol_handler_config<t_connection_context>::foreach_connection(callback_t cb)
+bool async_protocol_handler_config<t_connection_context>::foreach_connection(const callback_t &cb)
 {
   CRITICAL_REGION_LOCAL(m_connects_lock);
   for(auto& c: m_connects)
@@ -838,7 +838,7 @@ bool async_protocol_handler_config<t_connection_context>::foreach_connection(cal
 }
 //------------------------------------------------------------------------------------------
 template<class t_connection_context> template<class callback_t>
-bool async_protocol_handler_config<t_connection_context>::for_connection(const boost::uuids::uuid &connection_id, callback_t cb)
+bool async_protocol_handler_config<t_connection_context>::for_connection(const boost::uuids::uuid &connection_id, const callback_t &cb)
 {
   CRITICAL_REGION_LOCAL(m_connects_lock);
   async_protocol_handler<t_connection_context>* aph = find_connection(connection_id);