__cxx03/__concepts/same_as.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_SAME_AS_H
0010 #define _LIBCPP___CXX03___CONCEPTS_SAME_AS_H
0011
0012 #include <__cxx03/__config>
0013 #include <__cxx03/__type_traits/is_same.h>
0014
0015 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
0016 #  pragma GCC system_header
0017 #endif
0018
0019 _LIBCPP_BEGIN_NAMESPACE_STD
0020
0021 #if _LIBCPP_STD_VER >= 20
0022
0023 // [concept.same]
0024
0025 template <class _Tp, class _Up>
0026 concept __same_as_impl = _IsSame<_Tp, _Up>::value;
0027
0028 template <class _Tp, class _Up>
0029 concept same_as = __same_as_impl<_Tp, _Up> && __same_as_impl<_Up, _Tp>;
0030
0031 #endif // _LIBCPP_STD_VER >= 20
0032
0033 _LIBCPP_END_NAMESPACE_STD
0034
0035 #endif // _LIBCPP___CXX03___CONCEPTS_SAME_AS_H