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 28 template<class _Tp> 29 concept __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). 33 template<class _Tp> 34 concept __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