63 lines
2.8 KiB
C++
63 lines
2.8 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_COPY_BACKWARD_H
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#define _LIBCPP___ALGORITHM_COPY_BACKWARD_H
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#include <__algorithm/copy.h>
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#include <__algorithm/iterator_operations.h>
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#include <__algorithm/ranges_copy.h>
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#include <__algorithm/unwrap_iter.h>
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#include <__concepts/same_as.h>
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#include <__config>
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#include <__iterator/iterator_traits.h>
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#include <__iterator/reverse_iterator.h>
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#include <__ranges/subrange.h>
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#include <__utility/move.h>
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#include <__utility/pair.h>
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#include <cstring>
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#include <type_traits>
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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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template <class _AlgPolicy, class _InputIterator, class _OutputIterator,
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__enable_if_t<is_same<_AlgPolicy, _ClassicAlgPolicy>::value, int> = 0>
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inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_AFTER_CXX11 pair<_InputIterator, _OutputIterator>
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__copy_backward(_InputIterator __first, _InputIterator __last, _OutputIterator __result) {
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auto __ret = std::__copy(
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__unconstrained_reverse_iterator<_InputIterator>(__last),
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__unconstrained_reverse_iterator<_InputIterator>(__first),
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__unconstrained_reverse_iterator<_OutputIterator>(__result));
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return pair<_InputIterator, _OutputIterator>(__ret.first.base(), __ret.second.base());
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}
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#if _LIBCPP_STD_VER > 17 && !defined(_LIBCPP_HAS_NO_INCOMPLETE_RANGES)
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template <class _AlgPolicy, class _Iter1, class _Sent1, class _Iter2,
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__enable_if_t<is_same<_AlgPolicy, _RangeAlgPolicy>::value, int> = 0>
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_LIBCPP_HIDE_FROM_ABI constexpr pair<_Iter1, _Iter2> __copy_backward(_Iter1 __first, _Sent1 __last, _Iter2 __result) {
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auto __last_iter = _IterOps<_AlgPolicy>::next(__first, std::move(__last));
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auto __reverse_range = std::__reverse_range(std::ranges::subrange(std::move(__first), __last_iter));
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auto __ret = ranges::copy(std::move(__reverse_range), std::make_reverse_iterator(__result));
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return std::make_pair(__last_iter, __ret.out.base());
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}
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#endif // _LIBCPP_STD_VER > 17 && !defined(_LIBCPP_HAS_NO_INCOMPLETE_RANGES)
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template <class _BidirectionalIterator1, class _BidirectionalIterator2>
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inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_AFTER_CXX17 _BidirectionalIterator2
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copy_backward(_BidirectionalIterator1 __first, _BidirectionalIterator1 __last, _BidirectionalIterator2 __result) {
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return std::__copy_backward<_ClassicAlgPolicy>(__first, __last, __result).second;
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}
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_LIBCPP_END_NAMESPACE_STD
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#endif // _LIBCPP___ALGORITHM_COPY_BACKWARD_H
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