forked from OSchip/llvm-project
57 lines
1.7 KiB
C++
57 lines
1.7 KiB
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___ALGORITHM_REVERSE_H
|
|
#define _LIBCPP___ALGORITHM_REVERSE_H
|
|
|
|
#include <__algorithm/iter_swap.h>
|
|
#include <__config>
|
|
#include <__iterator/iterator_traits.h>
|
|
|
|
#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
|
|
#pragma GCC system_header
|
|
#endif
|
|
|
|
_LIBCPP_BEGIN_NAMESPACE_STD
|
|
|
|
template <class _BidirectionalIterator>
|
|
inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17
|
|
void
|
|
__reverse(_BidirectionalIterator __first, _BidirectionalIterator __last, bidirectional_iterator_tag)
|
|
{
|
|
while (__first != __last)
|
|
{
|
|
if (__first == --__last)
|
|
break;
|
|
_VSTD::iter_swap(__first, __last);
|
|
++__first;
|
|
}
|
|
}
|
|
|
|
template <class _RandomAccessIterator>
|
|
inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17
|
|
void
|
|
__reverse(_RandomAccessIterator __first, _RandomAccessIterator __last, random_access_iterator_tag)
|
|
{
|
|
if (__first != __last)
|
|
for (; __first < --__last; ++__first)
|
|
_VSTD::iter_swap(__first, __last);
|
|
}
|
|
|
|
template <class _BidirectionalIterator>
|
|
inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17
|
|
void
|
|
reverse(_BidirectionalIterator __first, _BidirectionalIterator __last)
|
|
{
|
|
_VSTD::__reverse(__first, __last, typename iterator_traits<_BidirectionalIterator>::iterator_category());
|
|
}
|
|
|
|
_LIBCPP_END_NAMESPACE_STD
|
|
|
|
#endif // _LIBCPP___ALGORITHM_REVERSE_H
|