Implement the first part of P0006R0: Adopt Type Traits Variable Templates for C++17. Significantly augment the existing tests.

llvm-svn: 251766

1 files changed, 92 insertions, 0 deletions

diff --git a/libcxx/test/std/utilities/meta/meta.unary/meta.unary.cat/is_enum.pass.cpp b/libcxx/test/std/utilities/meta/meta.unary/meta.unary.cat/is_enum.pass.cpp
new file mode 100644
index 00000000000..74db44f9cb9
--- /dev/null
+++ b/libcxx/test/std/utilities/meta/meta.unary/meta.unary.cat/is_enum.pass.cpp
@@ -0,0 +1,92 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// type_traits
+
+// is_enum
+
+#include <type_traits>
+#include "test_macros.h"
+
+template <class T>
+void test_is_enum()
+{
+    static_assert( std::is_enum<T>::value, "");
+    static_assert( std::is_enum<const T>::value, "");
+    static_assert( std::is_enum<volatile T>::value, "");
+    static_assert( std::is_enum<const volatile T>::value, "");
+#if TEST_STD_VER > 14
+    static_assert( std::is_enum_v<T>, "");
+    static_assert( std::is_enum_v<const T>, "");
+    static_assert( std::is_enum_v<volatile T>, "");
+    static_assert( std::is_enum_v<const volatile T>, "");
+#endif
+}
+
+template <class T>
+void test_is_not_enum()
+{
+    static_assert(!std::is_enum<T>::value, "");
+    static_assert(!std::is_enum<const T>::value, "");
+    static_assert(!std::is_enum<volatile T>::value, "");
+    static_assert(!std::is_enum<const volatile T>::value, "");
+#if TEST_STD_VER > 14
+    static_assert(!std::is_enum_v<T>, "");
+    static_assert(!std::is_enum_v<const T>, "");
+    static_assert(!std::is_enum_v<volatile T>, "");
+    static_assert(!std::is_enum_v<const volatile T>, "");
+#endif
+}
+
+class Empty
+{
+};
+
+class NotEmpty
+{
+    virtual ~NotEmpty();
+};
+
+union Union {};
+
+struct bit_zero
+{
+    int :  0;
+};
+
+class Abstract
+{
+    virtual ~Abstract() = 0;
+};
+
+enum Enum {zero, one};
+
+typedef void (*FunctionPtr)();
+
+int main()
+{
+    test_is_enum<Enum>();
+
+    test_is_not_enum<std::nullptr_t>();
+    test_is_not_enum<void>();
+    test_is_not_enum<int>();
+    test_is_not_enum<int&>();
+    test_is_not_enum<int&&>();
+    test_is_not_enum<int*>();
+    test_is_not_enum<double>();
+    test_is_not_enum<const int*>();
+    test_is_not_enum<char[3]>();
+    test_is_not_enum<char[]>();
+    test_is_not_enum<Union>();
+    test_is_not_enum<Empty>();
+    test_is_not_enum<bit_zero>();
+    test_is_not_enum<NotEmpty>();
+    test_is_not_enum<Abstract>();
+    test_is_not_enum<FunctionPtr>();
+}