diff --git a/include/ascs/object_pool.h b/include/ascs/object_pool.h
index f8920e3ddf5293238381e50243f06cba321ffc4e..c4c6dcfe2e201a3f17ddc94828bb1674bd842db6 100644
--- a/include/ascs/object_pool.h
+++ b/include/ascs/object_pool.h
@@ -156,7 +156,7 @@ protected:
 		if (old_object_ptr && !init_object_id(object_ptr, id))
 		{
 			std::lock_guard<std::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();
 		}
 
diff --git a/include/ascs/service_pump.h b/include/ascs/service_pump.h
index 2395aa748cf1e0c63d2f5aaeb702c1fd01ef27a0..491d824da7905038fe45d4268bdedcd6961d8b68 100644
--- a/include/ascs/service_pump.h
+++ b/include/ascs/service_pump.h
@@ -137,7 +137,7 @@ public:
 
 	int get_io_context_num() const {return (int) context_can.size();}
 	void get_io_context_refs(std::list<unsigned>& refs)
-		{if (!single_ctx) ascs::do_something_to_all(context_can, context_can_mutex, [&](context& item) {refs.push_back(item.refs);});}
+		{if (!single_ctx) ascs::do_something_to_all(context_can, context_can_mutex, [&](context& item) {refs.emplace_back(item.refs);});}
 
 	//do not call below function implicitly or explicitly, before 1.6, a service_pump is also an io_context, so we already have it implicitly,
 	// but in 1.6 and later, a service_pump is not an io_context anymore, then it is just provided to accommodate legacy usage in class
diff --git a/include/ascs/tcp/server.h b/include/ascs/tcp/server.h
index 6f83cf81e8bf7c006c99eb51b6c53e59c2303fed..93ef2794da3a0696f9af45f150b59ccb04ebfdeb 100644
--- a/include/ascs/tcp/server.h
+++ b/include/ascs/tcp/server.h
@@ -106,7 +106,7 @@ public:
 			if (!socket_ptr)
 				break;
 
-			sockets.push_back(std::move(socket_ptr));
+			sockets.emplace_back(std::move(socket_ptr));
 		}
 		if (num >= 0)
 			unified_out::info_out("finished pre-creating server sockets, but failed %d time(s).", num + 1);