1*4bdff4beSrobert //===----------------------------------------------------------------------===//
2*4bdff4beSrobert //
3*4bdff4beSrobert // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4*4bdff4beSrobert // See https://llvm.org/LICENSE.txt for license information.
5*4bdff4beSrobert // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6*4bdff4beSrobert //
7*4bdff4beSrobert //===----------------------------------------------------------------------===//
8*4bdff4beSrobert 
9*4bdff4beSrobert #ifndef _LIBCPP___TUPLE_PAIR_LIKE_H
10*4bdff4beSrobert #define _LIBCPP___TUPLE_PAIR_LIKE_H
11*4bdff4beSrobert 
12*4bdff4beSrobert #include <__config>
13*4bdff4beSrobert #include <__tuple_dir/tuple_like.h>
14*4bdff4beSrobert #include <__tuple_dir/tuple_size.h>
15*4bdff4beSrobert #include <__type_traits/remove_cvref.h>
16*4bdff4beSrobert 
17*4bdff4beSrobert #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
18*4bdff4beSrobert #  pragma GCC system_header
19*4bdff4beSrobert #endif
20*4bdff4beSrobert 
21*4bdff4beSrobert _LIBCPP_BEGIN_NAMESPACE_STD
22*4bdff4beSrobert 
23*4bdff4beSrobert #if _LIBCPP_STD_VER >= 20
24*4bdff4beSrobert 
25*4bdff4beSrobert template <class _Tp>
26*4bdff4beSrobert concept __pair_like = __tuple_like<_Tp> && tuple_size<remove_cvref_t<_Tp>>::value == 2;
27*4bdff4beSrobert 
28*4bdff4beSrobert #endif // _LIBCPP_STD_VER >= 20
29*4bdff4beSrobert 
30*4bdff4beSrobert _LIBCPP_END_NAMESPACE_STD
31*4bdff4beSrobert 
32*4bdff4beSrobert #endif // _LIBCPP___TUPLE_PAIR_LIKE_H
33