xref: /openbsd-src/gnu/llvm/libcxx/include/__concepts/class_or_enum.h (revision 4bdff4bed0e3d54e55670334c7d0077db4170f86)
1*4bdff4beSrobert //===----------------------------------------------------------------------===//
2*4bdff4beSrobert //
3*4bdff4beSrobert // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4*4bdff4beSrobert // See https://llvm.org/LICENSE.txt for license information.
5*4bdff4beSrobert // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6*4bdff4beSrobert //
7*4bdff4beSrobert //===----------------------------------------------------------------------===//
8*4bdff4beSrobert 
9*4bdff4beSrobert #ifndef _LIBCPP___CONCEPTS_CLASS_OR_ENUM_H
10*4bdff4beSrobert #define _LIBCPP___CONCEPTS_CLASS_OR_ENUM_H
11*4bdff4beSrobert 
12*4bdff4beSrobert #include <__config>
13*4bdff4beSrobert #include <__type_traits/is_class.h>
14*4bdff4beSrobert #include <__type_traits/is_enum.h>
15*4bdff4beSrobert #include <__type_traits/is_union.h>
16*4bdff4beSrobert #include <__type_traits/remove_cvref.h>
17*4bdff4beSrobert 
18*4bdff4beSrobert #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
19*4bdff4beSrobert #  pragma GCC system_header
20*4bdff4beSrobert #endif
21*4bdff4beSrobert 
22*4bdff4beSrobert _LIBCPP_BEGIN_NAMESPACE_STD
23*4bdff4beSrobert 
24*4bdff4beSrobert #if _LIBCPP_STD_VER > 17
25*4bdff4beSrobert 
26*4bdff4beSrobert // Whether a type is a class type or enumeration type according to the Core wording.
27*4bdff4beSrobert 
28*4bdff4beSrobert template<class _Tp>
29*4bdff4beSrobert concept __class_or_enum = is_class_v<_Tp> || is_union_v<_Tp> || is_enum_v<_Tp>;
30*4bdff4beSrobert 
31*4bdff4beSrobert // Work around Clang bug https://llvm.org/PR52970
32*4bdff4beSrobert // TODO: remove this workaround once libc++ no longer has to support Clang 13 (it was fixed in Clang 14).
33*4bdff4beSrobert template<class _Tp>
34*4bdff4beSrobert concept __workaround_52970 = is_class_v<__remove_cvref_t<_Tp>> || is_union_v<__remove_cvref_t<_Tp>>;
35*4bdff4beSrobert 
36*4bdff4beSrobert #endif // _LIBCPP_STD_VER > 17
37*4bdff4beSrobert 
38*4bdff4beSrobert _LIBCPP_END_NAMESPACE_STD
39*4bdff4beSrobert 
40*4bdff4beSrobert #endif // _LIBCPP___CONCEPTS_CLASS_OR_ENUM_H
41