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//===----------------------------------------------------------------------===//
//
// 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___ALGORITHM_RANGES_REVERSE_H
#define _LIBCPP___ALGORITHM_RANGES_REVERSE_H
#include <__config>
#include <__iterator/concepts.h>
#include <__iterator/iter_swap.h>
#include <__iterator/next.h>
#include <__iterator/permutable.h>
#include <__ranges/access.h>
#include <__ranges/concepts.h>
#include <__ranges/dangling.h>
#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
# pragma GCC system_header
#endif
#if _LIBCPP_STD_VER >= 20
_LIBCPP_BEGIN_NAMESPACE_STD
namespace ranges {
namespace __reverse {
struct __fn {
template <bidirectional_iterator _Iter, sentinel_for<_Iter> _Sent>
requires permutable<_Iter>
_LIBCPP_HIDE_FROM_ABI constexpr _Iter operator()(_Iter __first, _Sent __last) const {
if constexpr (random_access_iterator<_Iter>) {
if (__first == __last)
return __first;
auto __end = ranges::next(__first, __last);
auto __ret = __end;
while (__first < --__end) {
ranges::iter_swap(__first, __end);
++__first;
}
return __ret;
} else {
auto __end = ranges::next(__first, __last);
auto __ret = __end;
while (__first != __end) {
if (__first == --__end)
break;
ranges::iter_swap(__first, __end);
++__first;
}
return __ret;
}
}
template <bidirectional_range _Range>
requires permutable<iterator_t<_Range>>
_LIBCPP_HIDE_FROM_ABI constexpr borrowed_iterator_t<_Range> operator()(_Range&& __range) const {
return (*this)(ranges::begin(__range), ranges::end(__range));
}
};
} // namespace __reverse
inline namespace __cpo {
inline constexpr auto reverse = __reverse::__fn{};
} // namespace __cpo
} // namespace ranges
_LIBCPP_END_NAMESPACE_STD
#endif // _LIBCPP_STD_VER >= 20
#endif // _LIBCPP___ALGORITHM_RANGES_REVERSE_H
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