✨ add is_object trait

include/zll/meta/is_object.hpp

@@ -0,0 +1,26 @@
+/*
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at https://mozilla.org/MPL/2.0/.
+ */
+
+#ifndef ZLL_META_ISOBJECT_HPP
+#define ZLL_META_ISOBJECT_HPP
+
+#include "zll/meta/integral_constant.hpp"
+#include "zll/meta/is_array.hpp"
+#include "zll/meta/is_class.hpp"
+#include "zll/meta/is_scalar.hpp"
+#include "zll/meta/is_union.hpp"
+
+namespace zll {
+namespace meta {
+
+template <typename T>
+struct is_object
+    : bool_constant<is_scalar<T>::value || is_array<T>::value || is_union<T>::value || is_class<T>::value> {};
+
+}  // namespace meta
+}  // namespace zll
+
+#endif  // ZLL_META_ISOBJECT_HPP

include/zll/type_traits.hpp

@@ -16,6 +16,7 @@
 #include "zll/meta/is_floating_point.hpp"
 #include "zll/meta/is_integral.hpp"
 #include "zll/meta/is_member_pointer.hpp"
+#include "zll/meta/is_object.hpp"
 #include "zll/meta/is_pointer.hpp"
 #include "zll/meta/is_same.hpp"
 #include "zll/meta/is_scalar.hpp"

tests/unit_tests/meson.build

@@ -9,6 +9,7 @@ unit_tests_srcs = [
     'meta/is_floating_point_tests.cpp',
     'meta/is_integral_tests.cpp',
     'meta/is_member_pointer_tests.cpp',
+    'meta/is_object_tests.cpp',
     'meta/is_pointer_tests.cpp',
     'meta/is_same_tests.cpp',
     'meta/is_scalar_tests.cpp',

tests/unit_tests/meta/is_object_tests.cpp

@@ -0,0 +1,32 @@
+/*
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at https://mozilla.org/MPL/2.0/.
+ */
+
+#include "zll/meta/is_object.hpp"
+
+#include <utest.h>
+
+struct test_struct {
+    int val;
+};
+
+enum test_enum {};
+
+UTEST(meta_is_object, is_object) {
+    ASSERT_TRUE(zll::meta::is_object<int>::value);
+    ASSERT_TRUE(zll::meta::is_object<int*>::value);
+    ASSERT_TRUE(zll::meta::is_object<test_struct>::value);
+    ASSERT_TRUE(zll::meta::is_object<test_struct*>::value);
+    ASSERT_TRUE(zll::meta::is_object<int (*)()>::value);
+}
+
+UTEST(meta_is_object, is_not_object) {
+    ASSERT_FALSE(zll::meta::is_object<void>::value);
+    ASSERT_FALSE(zll::meta::is_object<int&>::value);
+    ASSERT_FALSE(zll::meta::is_object<char*&>::value);
+    ASSERT_FALSE(zll::meta::is_object<test_struct&>::value);
+    ASSERT_FALSE(zll::meta::is_object<int()>::value);
+    ASSERT_FALSE(zll::meta::is_object<void(&)()>::value);
+}