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_SAME_AS_H 10 #define _LIBCPP___CONCEPTS_SAME_AS_H 11 12 #include <__config> 13 #include <__type_traits/is_same.h> 14 15 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 16 # pragma GCC system_header 17 #endif 18 19 _LIBCPP_BEGIN_NAMESPACE_STD 20 21 #if _LIBCPP_STD_VER >= 20 22 23 // [concept.same] 24 25 template <class _Tp, class _Up> 26 concept __same_as_impl = _IsSame<_Tp, _Up>::value; 27 28 template <class _Tp, class _Up> 29 concept same_as = __same_as_impl<_Tp, _Up> && __same_as_impl<_Up, _Tp>; 30 31 #endif // _LIBCPP_STD_VER >= 20 32 33 _LIBCPP_END_NAMESPACE_STD 34 35 #endif // _LIBCPP___CONCEPTS_SAME_AS_H 36