1//===----------------------------------------------------------------------===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8
9#ifndef _LIBCPP___CONCEPTS_CLASS_OR_ENUM_H
10#define _LIBCPP___CONCEPTS_CLASS_OR_ENUM_H
11
12#include <__config>
13#include <__type_traits/is_class.h>
14#include <__type_traits/is_enum.h>
15#include <__type_traits/is_union.h>
16#include <__type_traits/remove_cvref.h>
17
18#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
19#  pragma GCC system_header
20#endif
21
22_LIBCPP_BEGIN_NAMESPACE_STD
23
24#if _LIBCPP_STD_VER >= 20
25
26// Whether a type is a class type or enumeration type according to the Core wording.
27
28template <class _Tp>
29concept __class_or_enum = is_class_v<_Tp> || is_union_v<_Tp> || is_enum_v<_Tp>;
30
31// Work around Clang bug https://llvm.org/PR52970
32// TODO: remove this workaround once libc++ no longer has to support Clang 13 (it was fixed in Clang 14).
33template <class _Tp>
34concept __workaround_52970 = is_class_v<__remove_cvref_t<_Tp>> || is_union_v<__remove_cvref_t<_Tp>>;
35
36#endif // _LIBCPP_STD_VER >= 20
37
38_LIBCPP_END_NAMESPACE_STD
39
40#endif // _LIBCPP___CONCEPTS_CLASS_OR_ENUM_H
41