5fab33af7f
Use `using` aliases to avoid instantiating lots of types Reviewed By: ldionne, #libc Spies: libcxx-commits, miyuki Differential Revision: https://reviews.llvm.org/D132785
38 lines
1.2 KiB
C++
38 lines
1.2 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#ifndef _LIBCPP___CONCEPTS_CLASS_OR_ENUM_H
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#define _LIBCPP___CONCEPTS_CLASS_OR_ENUM_H
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#include <__config>
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#include <type_traits>
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#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
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# pragma GCC system_header
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#endif
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_LIBCPP_BEGIN_NAMESPACE_STD
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#if _LIBCPP_STD_VER > 17
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// Whether a type is a class type or enumeration type according to the Core wording.
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template<class _Tp>
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concept __class_or_enum = is_class_v<_Tp> || is_union_v<_Tp> || is_enum_v<_Tp>;
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// Work around Clang bug https://llvm.org/PR52970
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// TODO: remove this workaround once libc++ no longer has to support Clang 13 (it was fixed in Clang 14).
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template<class _Tp>
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concept __workaround_52970 = is_class_v<__remove_cvref_t<_Tp>> || is_union_v<__remove_cvref_t<_Tp>>;
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#endif // _LIBCPP_STD_VER > 17
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_LIBCPP_END_NAMESPACE_STD
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#endif // _LIBCPP___CONCEPTS_CLASS_OR_ENUM_H
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