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___TUPLE_PAIR_LIKE_H
10#define _LIBCPP___TUPLE_PAIR_LIKE_H
11
12#include <__config>
13#include <__tuple/tuple_like.h>
14#include <__tuple/tuple_size.h>
15#include <__type_traits/remove_cvref.h>
16
17#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
18#  pragma GCC system_header
19#endif
20
21_LIBCPP_BEGIN_NAMESPACE_STD
22
23#if _LIBCPP_STD_VER >= 20
24
25template <class _Tp>
26concept __pair_like = __tuple_like<_Tp> && tuple_size<remove_cvref_t<_Tp>>::value == 2;
27
28#endif // _LIBCPP_STD_VER >= 20
29
30_LIBCPP_END_NAMESPACE_STD
31
32#endif // _LIBCPP___TUPLE_PAIR_LIKE_H
33