mw/com: Fix method signature to avoid copies of return type

score/mw/com/impl/methods/BUILD

@@ -28,6 +28,17 @@ cc_library(
     ],
 )
 
+cc_library(
+    name = "method_handler_checker",
+    srcs = ["method_handler_checker.cpp"],
+    hdrs = ["method_handler_checker.h"],
+    features = COMPILER_WARNING_FEATURES,
+    tags = ["FFI"],
+    visibility = [
+        "//score/mw/com:__subpackages__",
+    ],
+)
+
 cc_library(
     name = "proxy_method_base",
     srcs = ["proxy_method_base.cpp"],
@@ -111,6 +122,15 @@ cc_gtest_unit_test(
     ],
 )
 
+cc_gtest_unit_test(
+    name = "method_handler_checker_test",
+    srcs = ["method_handler_checker_test.cpp"],
+    features = COMPILER_WARNING_FEATURES,
+    deps = [
+        ":method_handler_checker",
+    ],
+)
+
 cc_unit_test(
     name = "proxy_method_test",
     srcs = ["proxy_method_test.cpp"],
@@ -155,6 +175,7 @@ cc_library(
         "//score/mw/com/impl:__subpackages__",
     ],
     deps = [
+        ":method_handler_checker",
         ":skeleton_method_binding",
         "//score/mw/com/impl:instance_identifier",
         "//score/mw/com/impl:skeleton_base",
@@ -188,6 +209,7 @@ cc_gtest_unit_test(
         ":skeleton_method",
         "//score/mw/com/impl/bindings/mock_binding",
         "//score/mw/com/impl/plumbing:skeleton_method_binding_factory_mock",
+        "//score/mw/com/impl/test:binding_factory_resources",
         "@score_baselibs//score/language/futurecpp",
     ],
 )
@@ -209,6 +231,7 @@ cc_gtest_unit_test(
 cc_unit_test_suites_for_host_and_qnx(
     name = "unit_test_suite",
     cc_unit_tests = [
+        ":method_handler_checker_test",
         ":method_signature_element_ptr_test",
         ":proxy_method_test",
         "skeleton_method_base_test",

score/mw/com/impl/methods/method_handler_checker.cpp

@@ -0,0 +1,13 @@
+/********************************************************************************
+ * Copyright (c) 2025 Contributors to the Eclipse Foundation
+ *
+ * See the NOTICE file(s) distributed with this work for additional
+ * information regarding copyright ownership.
+ *
+ * This program and the accompanying materials are made available under the
+ * terms of the Apache License Version 2.0 which is available at
+ * https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ ********************************************************************************/
+#include "score/mw/com/impl/methods/method_handler_checker.h"