__cxx03/__concepts/class_or_enum.h

0001 //===----------------------------------------------------------------------===//
0002 //
0003 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
0004 // See https://llvm.org/LICENSE.txt for license information.
0005 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
0006 //
0007 //===----------------------------------------------------------------------===//
0008
0009 #ifndef _LIBCPP___CXX03___CONCEPTS_CLASS_OR_ENUM_H
0010 #define _LIBCPP___CXX03___CONCEPTS_CLASS_OR_ENUM_H
0011
0012 #include <__cxx03/__config>
0013 #include <__cxx03/__type_traits/is_class.h>
0014 #include <__cxx03/__type_traits/is_enum.h>
0015 #include <__cxx03/__type_traits/is_union.h>
0016 #include <__cxx03/__type_traits/remove_cvref.h>
0017
0018 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
0019 #  pragma GCC system_header
0020 #endif
0021
0022 _LIBCPP_BEGIN_NAMESPACE_STD
0023
0024 #if _LIBCPP_STD_VER >= 20
0025
0026 // Whether a type is a class type or enumeration type according to the Core wording.
0027
0028 template <class _Tp>
0029 concept __class_or_enum = is_class_v<_Tp> || is_union_v<_Tp> || is_enum_v<_Tp>;
0030
0031 #endif // _LIBCPP_STD_VER >= 20
0032
0033 _LIBCPP_END_NAMESPACE_STD
0034
0035 #endif // _LIBCPP___CXX03___CONCEPTS_CLASS_OR_ENUM_H