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