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| 1 | //===----------------------------------------------------------------------===// |
|---|---|
| 2 | // |
| 3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| 4 | // See https://llvm.org/LICENSE.txt for license information. |
| 5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| 6 | // |
| 7 | //===----------------------------------------------------------------------===// |
| 8 | |
| 9 | #ifndef _LIBCPP___CXX03___ALGORITHM_REVERSE_H |
| 10 | #define _LIBCPP___CXX03___ALGORITHM_REVERSE_H |
| 11 | |
| 12 | #include <__cxx03/__algorithm/iter_swap.h> |
| 13 | #include <__cxx03/__algorithm/iterator_operations.h> |
| 14 | #include <__cxx03/__config> |
| 15 | #include <__cxx03/__iterator/iterator_traits.h> |
| 16 | #include <__cxx03/__utility/move.h> |
| 17 | |
| 18 | #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) |
| 19 | # pragma GCC system_header |
| 20 | #endif |
| 21 | |
| 22 | _LIBCPP_PUSH_MACROS |
| 23 | #include <__cxx03/__undef_macros> |
| 24 | |
| 25 | _LIBCPP_BEGIN_NAMESPACE_STD |
| 26 | |
| 27 | template <class _AlgPolicy, class _BidirectionalIterator> |
| 28 | inline _LIBCPP_HIDE_FROM_ABI void |
| 29 | __reverse_impl(_BidirectionalIterator __first, _BidirectionalIterator __last, bidirectional_iterator_tag) { |
| 30 | while (__first != __last) { |
| 31 | if (__first == --__last) |
| 32 | break; |
| 33 | _IterOps<_AlgPolicy>::iter_swap(__first, __last); |
| 34 | ++__first; |
| 35 | } |
| 36 | } |
| 37 | |
| 38 | template <class _AlgPolicy, class _RandomAccessIterator> |
| 39 | inline _LIBCPP_HIDE_FROM_ABI void |
| 40 | __reverse_impl(_RandomAccessIterator __first, _RandomAccessIterator __last, random_access_iterator_tag) { |
| 41 | if (__first != __last) |
| 42 | for (; __first < --__last; ++__first) |
| 43 | _IterOps<_AlgPolicy>::iter_swap(__first, __last); |
| 44 | } |
| 45 | |
| 46 | template <class _AlgPolicy, class _BidirectionalIterator, class _Sentinel> |
| 47 | _LIBCPP_HIDE_FROM_ABI void __reverse(_BidirectionalIterator __first, _Sentinel __last) { |
| 48 | using _IterCategory = typename _IterOps<_AlgPolicy>::template __iterator_category<_BidirectionalIterator>; |
| 49 | std::__reverse_impl<_AlgPolicy>(std::move(__first), std::move(__last), _IterCategory()); |
| 50 | } |
| 51 | |
| 52 | template <class _BidirectionalIterator> |
| 53 | inline _LIBCPP_HIDE_FROM_ABI void reverse(_BidirectionalIterator __first, _BidirectionalIterator __last) { |
| 54 | std::__reverse<_ClassicAlgPolicy>(std::move(__first), std::move(__last)); |
| 55 | } |
| 56 | |
| 57 | _LIBCPP_END_NAMESPACE_STD |
| 58 | |
| 59 | _LIBCPP_POP_MACROS |
| 60 | |
| 61 | #endif // _LIBCPP___CXX03___ALGORITHM_REVERSE_H |
| 62 |
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