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_TUPLE_LIKE_H 10 #define _LIBCPP___TUPLE_TUPLE_LIKE_H 11 12 #include <__config> 13 #include <__fwd/subrange.h> 14 #include <__tuple/tuple_like_no_subrange.h> 15 #include <__tuple/tuple_size.h> 16 #include <__type_traits/remove_cvref.h> 17 18 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 19 # pragma GCC system_header 20 #endif 21 22 _LIBCPP_BEGIN_NAMESPACE_STD 23 24 #if _LIBCPP_STD_VER >= 20 25 26 template <class _Tp> 27 inline constexpr bool __is_ranges_subrange_v = false; 28 29 template <class _Iter, class _Sent, ranges::subrange_kind _Kind> 30 inline constexpr bool __is_ranges_subrange_v<ranges::subrange<_Iter, _Sent, _Kind>> = true; 31 32 template <class _Tp> 33 concept __tuple_like = __tuple_like_no_subrange<_Tp> || __is_ranges_subrange_v<remove_cvref_t<_Tp>>; 34 35 // As of writing this comment every use of `pair-like` in the standard excludes `ranges::subrange`, so 36 // you most likely want to use `__pair_like_no_subrange` if you're looking for `pair-like`. 37 38 #endif // _LIBCPP_STD_VER >= 20 39 40 _LIBCPP_END_NAMESPACE_STD 41 42 #endif // _LIBCPP___TUPLE_TUPLE_LIKE_H 43