diff --git a/include/ascs/object_pool.h b/include/ascs/object_pool.h
index 451c27387595e3991d56f3c00ce4859999e500bf..e6f598d8391595bfa5cae85303cbec0ac39ff246 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 2a7e3c2f03fe9996e095ffe0bb1c329fd39e2ae2..4beb7b69062352d031ab42aa4cd10f7ceed62d70 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 13abaa0c66cf69252f1e30568bffaedc8ecf9aa8..aa498379252d2514ae2c1dfcd510fa1a097d8ecf 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);