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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_REVERSE_H
#define _LIBCPP___ALGORITHM_REVERSE_H
#include <__algorithm/iter_swap.h>
#include <__algorithm/iterator_operations.h>
#include <__config>
#include <__iterator/iterator_traits.h>
#include <__utility/move.h>
#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
# pragma GCC system_header
#endif
_LIBCPP_BEGIN_NAMESPACE_STD
template <class _AlgPolicy, class _BidirectionalIterator>
inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX20
void
__reverse_impl(_BidirectionalIterator __first, _BidirectionalIterator __last, bidirectional_iterator_tag)
{
while (__first != __last)
{
if (__first == --__last)
break;
_IterOps<_AlgPolicy>::iter_swap(__first, __last);
++__first;
}
}
template <class _AlgPolicy, class _RandomAccessIterator>
inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX20
void
__reverse_impl(_RandomAccessIterator __first, _RandomAccessIterator __last, random_access_iterator_tag)
{
if (__first != __last)
for (; __first < --__last; ++__first)
_IterOps<_AlgPolicy>::iter_swap(__first, __last);
}
template <class _AlgPolicy, class _BidirectionalIterator, class _Sentinel>
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20
void __reverse(_BidirectionalIterator __first, _Sentinel __last) {
using _IterCategory = typename _IterOps<_AlgPolicy>::template __iterator_category<_BidirectionalIterator>;
std::__reverse_impl<_AlgPolicy>(std::move(__first), std::move(__last), _IterCategory());
}
template <class _BidirectionalIterator>
inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX20
void
reverse(_BidirectionalIterator __first, _BidirectionalIterator __last)
{
std::__reverse<_ClassicAlgPolicy>(std::move(__first), std::move(__last));
}
_LIBCPP_END_NAMESPACE_STD
#endif // _LIBCPP___ALGORITHM_REVERSE_H
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