84 lines
2.2 KiB
C++
84 lines
2.2 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___ALGORITHM_RANGES_REVERSE_H
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#define _LIBCPP___ALGORITHM_RANGES_REVERSE_H
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#include <__config>
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#include <__iterator/concepts.h>
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#include <__iterator/iter_swap.h>
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#include <__iterator/next.h>
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#include <__iterator/permutable.h>
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#include <__ranges/access.h>
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#include <__ranges/concepts.h>
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#include <__ranges/dangling.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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#if _LIBCPP_STD_VER > 17 && !defined(_LIBCPP_HAS_NO_INCOMPLETE_RANGES)
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_LIBCPP_BEGIN_NAMESPACE_STD
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namespace ranges {
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namespace __reverse {
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struct __fn {
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template <bidirectional_iterator _Iter, sentinel_for<_Iter> _Sent>
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requires permutable<_Iter>
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_LIBCPP_HIDE_FROM_ABI constexpr
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_Iter operator()(_Iter __first, _Sent __last) const {
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if constexpr (random_access_iterator<_Iter>) {
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if (__first == __last)
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return __first;
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auto __end = ranges::next(__first, __last);
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auto __ret = __end;
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while (__first < --__end) {
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ranges::iter_swap(__first, __end);
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++__first;
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}
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return __ret;
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} else {
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auto __end = ranges::next(__first, __last);
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auto __ret = __end;
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while (__first != __end) {
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if (__first == --__end)
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break;
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ranges::iter_swap(__first, __end);
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++__first;
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}
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return __ret;
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}
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}
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template <bidirectional_range _Range>
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requires permutable<iterator_t<_Range>>
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_LIBCPP_HIDE_FROM_ABI constexpr
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borrowed_iterator_t<_Range> operator()(_Range&& __range) const {
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return (*this)(ranges::begin(__range), ranges::end(__range));
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}
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};
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} // namespace __reverse
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inline namespace __cpo {
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inline constexpr auto reverse = __reverse::__fn{};
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} // namespace __cpo
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} // namespace ranges
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_LIBCPP_END_NAMESPACE_STD
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#endif // _LIBCPP_STD_VER > 17 && !defined(_LIBCPP_HAS_NO_INCOMPLETE_RANGES)
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#endif // _LIBCPP___ALGORITHM_RANGES_REVERSE_H
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