Replace container insertion push_back with emplace_back.

include/object_pool.h

@@ -156,7 +156,7 @@ protected:
 		if (old_object_ptr && !init_object_id(object_ptr, id))
 		{
 			boost::lock_guard<boost::mutex> lock(invalid_object_can_mutex);
-			invalid_object_can.push_back(old_object_ptr);
+			invalid_object_can.emplace_back(old_object_ptr);
 			old_object_ptr.reset();
 		}
 

include/service_pump.h

@@ -144,7 +144,7 @@ public:
 		{
 			boost::lock_guard<boost::mutex> lock(context_can_mutex);
 			for (BOOST_AUTO(iter, context_can.begin()); iter != context_can.end(); ++iter)
-				refs.push_back(iter->refs);
+				refs.emplace_back(iter->refs);
 		}
 	}
 

include/tcp/server.h

@@ -106,7 +106,7 @@ public:
 			if (!socket_ptr)
 				break;
 
-			sockets.push_back(socket_ptr);
+			sockets.emplace_back(socket_ptr);
 		}
 		if (num >= 0)
 			unified_out::info_out("finished pre-creating server sockets, but failed %d time(s).", num + 1);