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94461822c7
`subrange` is also a `tuple-like`. To avoid the add entire `subrange` dependencies to `tuple-like`, we need forward declaration of `subrange`. However, the class template constraints of `subrange` currently requires `__iterator/concepts.h`, which requires `<concepts>`. The problem is that currently `tuple-like` is used in several different places, including libc++ extension for pair constructors. we don't want to add `<concepts>` to pair and other stuff. So this change also created several small headers that `subrange`'s declaration needed inside `__iterator/concepts/` Differential Revision: https://reviews.llvm.org/D136268
52 lines
1.4 KiB
C++
52 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/array.h>
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#include <__fwd/pair.h>
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#include <__fwd/subrange.h>
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#include <__fwd/tuple.h>
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#include <__type_traits/integral_constant.h>
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#include <__type_traits/remove_cvref.h>
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#include <cstddef>
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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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struct __tuple_like_impl : false_type {};
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template <class... _Tp>
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struct __tuple_like_impl<tuple<_Tp...> > : true_type {};
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template <class _T1, class _T2>
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struct __tuple_like_impl<pair<_T1, _T2> > : true_type {};
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template <class _Tp, size_t _Size>
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struct __tuple_like_impl<array<_Tp, _Size> > : true_type {};
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template <class _Ip, class _Sp, ranges::subrange_kind _Kp>
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struct __tuple_like_impl<ranges::subrange<_Ip, _Sp, _Kp> > : true_type {};
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template <class _Tp>
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concept __tuple_like = __tuple_like_impl<remove_cvref_t<_Tp>>::value;
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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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