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 > 17
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 > 17
32 
33 _LIBCPP_END_NAMESPACE_STD
34 
35 #endif // _LIBCPP___CONCEPTS_SAME_AS_H
36