| //===----------------------------------------------------------------------===// |
| // |
| // 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 |