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