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// -*- C++ -*-
//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#ifndef _LIBCPP___RANGES_DANGLING_H
#define _LIBCPP___RANGES_DANGLING_H
#include <__config>
#include <__ranges/access.h>
#include <__ranges/concepts.h>
#include <__type_traits/conditional.h>
#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
# pragma GCC system_header
#endif
_LIBCPP_BEGIN_NAMESPACE_STD
#if _LIBCPP_STD_VER >= 20
namespace ranges {
struct dangling {
dangling() = default;
_LIBCPP_HIDE_FROM_ABI constexpr dangling(auto&&...) noexcept {}
};
template <range _Rp>
using borrowed_iterator_t = _If<borrowed_range<_Rp>, iterator_t<_Rp>, dangling>;
// borrowed_subrange_t defined in <__ranges/subrange.h>
} // namespace ranges
#endif // _LIBCPP_STD_VER >= 20
_LIBCPP_END_NAMESPACE_STD
#endif // _LIBCPP___RANGES_DANGLING_H
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