fix: entity created callback called too often (#111)

Author: zaucy

ecsact/entt/wrapper/core.hh

@@ -216,43 +216,43 @@ inline auto _trigger_create_entity_events(
 ) -> void {
 	using ecsact::entt::detail::created_entity;
 
-	if(!events_collector.has_entity_created_callback()) {
-		return;
-	}
-
 	auto& reg = ecsact::entt::get_registry(registry_id);
 
-	::entt::basic_view created_view{
-		reg.template storage<created_entity>(),
-	};
+	if(events_collector.has_entity_created_callback()) {
+		::entt::basic_view created_view{
+			reg.template storage<created_entity>(),
+		};
 
-	for(ecsact::entt::entity_id entity : created_view) {
-		events_collector.invoke_entity_created_callback(
-			entity,
-			created_view.template get<created_entity>(entity).placeholder_entity_id
-		);
+		for(ecsact::entt::entity_id entity : created_view) {
+			events_collector.invoke_entity_created_callback(
+				entity,
+				created_view.template get<created_entity>(entity).placeholder_entity_id
+			);
+		}
 	}
+
+	reg.clear<created_entity>();
 }
 
 inline auto _trigger_destroy_entity_events(
 	ecsact_registry_id                                registry_id,
 	ecsact::entt::detail::execution_events_collector& events_collector
 ) -> void {
-	auto& reg = ecsact::entt::get_registry(registry_id);
-
 	using ecsact::entt::detail::destroyed_entity;
 
-	if(!events_collector.has_entity_destroyed_callback()) {
-		return;
-	}
+	auto& reg = ecsact::entt::get_registry(registry_id);
 
-	::entt::basic_view destroy_view{
-		reg.template storage<destroyed_entity>(),
-	};
+	if(events_collector.has_entity_destroyed_callback()) {
+		::entt::basic_view destroy_view{
+			reg.template storage<destroyed_entity>(),
+		};
 
-	for(ecsact::entt::entity_id entity : destroy_view) {
-		events_collector.invoke_entity_destroyed_callback(entity);
+		for(ecsact::entt::entity_id entity : destroy_view) {
+			events_collector.invoke_entity_destroyed_callback(entity);
+		}
 	}
+
+	reg.clear<destroyed_entity>();
 }
 
 template<typename C>

test/runtime_test.cc

@@ -789,7 +789,8 @@ TEST(Core, CreateAndDestroyEntity) {
 		ecsact_placeholder_entity_id placeholder_entity_id;
 	};
 
-	auto info = callback_info{};
+	auto created_entity = ecsact_invalid_entity_id;
+	auto info = std::optional<callback_info>{};
 	auto options = ecsact::core::execution_options{};
 	auto evc = ecsact::core::execution_events_collector<>{};
 
@@ -798,42 +799,55 @@ TEST(Core, CreateAndDestroyEntity) {
 			ecsact_entity_id             entity_id,
 			ecsact_placeholder_entity_id placeholder_entity_id
 		) {
-			info.entity_created = true;
-			info.entity_id = entity_id;
-			info.placeholder_entity_id = placeholder_entity_id;
+			info = callback_info{};
+			info->entity_created = true;
+			info->entity_id = entity_id;
+			info->placeholder_entity_id = placeholder_entity_id;
+			created_entity = entity_id;
 		}
 	);
 
 	evc.set_entity_destroyed_callback([&](ecsact_entity_id entity_id) {
-		info.entity_destroyed = true;
-		info.entity_id = entity_id;
+		info = callback_info{};
+		info->entity_destroyed = true;
+		info->entity_id = entity_id;
 	});
 
 	options.create_entity(static_cast<ecsact_placeholder_entity_id>(42))
 		.add_component(&component_a);
 	auto exec_err = reg.execute_systems(std::array{options}, evc);
 	EXPECT_EQ(exec_err, ECSACT_EXEC_SYS_OK);
 
-	ASSERT_TRUE(info.entity_created);
-	ASSERT_FALSE(info.entity_destroyed);
+	ASSERT_TRUE(info.has_value());
+	ASSERT_TRUE(info->entity_created);
+	ASSERT_FALSE(info->entity_destroyed);
+	ASSERT_EQ(info->entity_id, created_entity);
 	ASSERT_EQ(reg.count_entities(), 1);
 
 	EXPECT_EQ(
-		info.placeholder_entity_id,
+		info->placeholder_entity_id,
 		static_cast<ecsact_placeholder_entity_id>(42)
 	);
 
-	auto comp = reg.get_component<runtime_test::EntityTesting>(info.entity_id);
+	auto comp = reg.get_component<runtime_test::EntityTesting>(info->entity_id);
 
 	ASSERT_EQ(comp.a, 6);
 
 	options.clear();
-	options.destroy_entity(info.entity_id);
+	info = std::nullopt;
 
+	// Make sure create doesn't get called again
+	exec_err = reg.execute_systems(std::array{options}, evc);
+	ASSERT_EQ(exec_err, ECSACT_EXEC_SYS_OK);
+	ASSERT_FALSE(info.has_value());
+
+	options.destroy_entity(created_entity);
+	info = std::nullopt;
 	exec_err = reg.execute_systems(std::array{options}, evc);
 	ASSERT_EQ(exec_err, ECSACT_EXEC_SYS_OK);
 	ASSERT_EQ(reg.count_entities(), 0);
-	ASSERT_TRUE(info.entity_destroyed);
+	ASSERT_TRUE(info.has_value());
+	ASSERT_TRUE(info->entity_destroyed);
 }
 
 TEST(Core, MultiPkgUpdate) {