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_DIFFERENT_FROM_H
10#define _LIBCPP___CONCEPTS_DIFFERENT_FROM_H
11
12#include <__concepts/same_as.h>
13#include <__config>
14#include <__type_traits/remove_cvref.h>
15
16#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
17# pragma GCC system_header
18#endif
19
20_LIBCPP_BEGIN_NAMESPACE_STD
21
22#if _LIBCPP_STD_VER >= 20
23
24template <class _Tp, class _Up>
25concept __different_from = !same_as<remove_cvref_t<_Tp>, remove_cvref_t<_Up>>;
26
27#endif // _LIBCPP_STD_VER >= 20
28
29_LIBCPP_END_NAMESPACE_STD
30
31#endif // _LIBCPP___CONCEPTS_DIFFERENT_FROM_H
32