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42 lines
1.4 KiB
C++
42 lines
1.4 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#ifndef _LIBCPP___TUPLE_TUPLE_LIKE_H
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#define _LIBCPP___TUPLE_TUPLE_LIKE_H
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#include <__config>
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#include <__fwd/subrange.h>
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#include <__tuple/tuple_like_no_subrange.h>
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#include <__tuple/tuple_size.h>
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#include <__type_traits/remove_cvref.h>
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#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
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# pragma GCC system_header
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#endif
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_LIBCPP_BEGIN_NAMESPACE_STD
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#if _LIBCPP_STD_VER >= 20
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template <class _Tp>
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inline constexpr bool __is_ranges_subrange_v = false;
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template <class _Iter, class _Sent, ranges::subrange_kind _Kind>
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inline constexpr bool __is_ranges_subrange_v<ranges::subrange<_Iter, _Sent, _Kind>> = true;
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template <class _Tp>
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concept __tuple_like = __tuple_like_no_subrange<_Tp> || __is_ranges_subrange_v<remove_cvref_t<_Tp>>;
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// As of writing this comment every use of `pair-like` in the standard excludes `ranges::subrange`, so
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// you most likely want to use `__pair_like_no_subrange` if you're looking for `pair-like`.
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#endif // _LIBCPP_STD_VER >= 20
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_LIBCPP_END_NAMESPACE_STD
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#endif // _LIBCPP___TUPLE_TUPLE_LIKE_H
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