Add detail/is_scoped_enum.hpp

test/is_scoped_enum_test.cpp

@@ -0,0 +1,68 @@
+// Copyright 2020 Peter Dimov
+// Distributed under the Boost Software License, Version 1.0.
+// https://www.boost.org/LICENSE_1_0.txt
+
+#include <boost/endian/detail/is_scoped_enum.hpp>
+#include <boost/core/lightweight_test_trait.hpp>
+#include <boost/config.hpp>
+
+enum E1 {};
+
+#if !defined(BOOST_NO_CXX11_SCOPED_ENUMS)
+
+enum E2: long {};
+enum class E3 {};
+enum class E4: long {};
+
+#endif
+
+struct X
+{
+    operator int() const { return 0; }
+};
+
+struct Y;
+
+template<class T> void test_true()
+{
+    using boost::endian::detail::is_scoped_enum;
+
+    BOOST_TEST_TRAIT_TRUE((is_scoped_enum<T>));
+    BOOST_TEST_TRAIT_TRUE((is_scoped_enum<T const>));
+    BOOST_TEST_TRAIT_TRUE((is_scoped_enum<T volatile>));
+    BOOST_TEST_TRAIT_TRUE((is_scoped_enum<T const volatile>));
+}
+
+template<class T> void test_false()
+{
+    using boost::endian::detail::is_scoped_enum;
+
+    BOOST_TEST_TRAIT_FALSE((is_scoped_enum<T>));
+    BOOST_TEST_TRAIT_FALSE((is_scoped_enum<T const>));
+    BOOST_TEST_TRAIT_FALSE((is_scoped_enum<T volatile>));
+    BOOST_TEST_TRAIT_FALSE((is_scoped_enum<T const volatile>));
+}
+
+int main()
+{
+    test_false<int>();
+    test_false<bool>();
+    test_false<X>();
+    test_false<Y>();
+    test_false<void>();
+    test_false<int[]>();
+    test_false<int[1]>();
+
+    test_false<E1>();
+
+#if !defined(BOOST_NO_CXX11_SCOPED_ENUMS)
+
+    test_false<E2>();
+
+    test_true<E3>();
+    test_true<E4>();
+
+#endif
+
+    return boost::report_errors();
+}