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49 lines
1.5 KiB
C++
49 lines
1.5 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___FWD_SUBRANGE_H
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#define _LIBCPP___FWD_SUBRANGE_H
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#include <__concepts/copyable.h>
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#include <__config>
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#include <__iterator/concepts.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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#if _LIBCPP_STD_VER >= 20
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_LIBCPP_BEGIN_NAMESPACE_STD
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namespace ranges {
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enum class subrange_kind : bool { unsized, sized };
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template <input_or_output_iterator _Iter, sentinel_for<_Iter> _Sent, subrange_kind _Kind>
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requires(_Kind == subrange_kind::sized || !sized_sentinel_for<_Sent, _Iter>)
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class _LIBCPP_TEMPLATE_VIS subrange;
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template <size_t _Index, class _Iter, class _Sent, subrange_kind _Kind>
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requires((_Index == 0 && copyable<_Iter>) || _Index == 1)
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_LIBCPP_HIDE_FROM_ABI constexpr auto get(const subrange<_Iter, _Sent, _Kind>&);
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template <size_t _Index, class _Iter, class _Sent, subrange_kind _Kind>
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requires(_Index < 2)
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_LIBCPP_HIDE_FROM_ABI constexpr auto get(subrange<_Iter, _Sent, _Kind>&&);
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} // namespace ranges
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using ranges::get;
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_LIBCPP_END_NAMESPACE_STD
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#endif // _LIBCPP_STD_VER >= 20
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#endif // _LIBCPP___FWD_SUBRANGE_H
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