1e78f53d1SNikolas Klauser //===----------------------------------------------------------------------===// 2e78f53d1SNikolas Klauser // 3e78f53d1SNikolas Klauser // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4e78f53d1SNikolas Klauser // See https://llvm.org/LICENSE.txt for license information. 5e78f53d1SNikolas Klauser // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6e78f53d1SNikolas Klauser // 7e78f53d1SNikolas Klauser //===----------------------------------------------------------------------===// 8e78f53d1SNikolas Klauser 9*ce777190SNikolas Klauser #ifndef _LIBCPP___CXX03___ALGORITHM_REVERSE_H 10*ce777190SNikolas Klauser #define _LIBCPP___CXX03___ALGORITHM_REVERSE_H 11e78f53d1SNikolas Klauser 1273fbae83SNikolas Klauser #include <__cxx03/__algorithm/iter_swap.h> 1373fbae83SNikolas Klauser #include <__cxx03/__algorithm/iterator_operations.h> 1473fbae83SNikolas Klauser #include <__cxx03/__config> 1573fbae83SNikolas Klauser #include <__cxx03/__iterator/iterator_traits.h> 1673fbae83SNikolas Klauser #include <__cxx03/__utility/move.h> 17e78f53d1SNikolas Klauser 18e78f53d1SNikolas Klauser #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 19e78f53d1SNikolas Klauser # pragma GCC system_header 20e78f53d1SNikolas Klauser #endif 21e78f53d1SNikolas Klauser 22e78f53d1SNikolas Klauser _LIBCPP_PUSH_MACROS 2373fbae83SNikolas Klauser #include <__cxx03/__undef_macros> 24e78f53d1SNikolas Klauser 25e78f53d1SNikolas Klauser _LIBCPP_BEGIN_NAMESPACE_STD 26e78f53d1SNikolas Klauser 27e78f53d1SNikolas Klauser template <class _AlgPolicy, class _BidirectionalIterator> 28e78f53d1SNikolas Klauser inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 void 29e78f53d1SNikolas Klauser __reverse_impl(_BidirectionalIterator __first, _BidirectionalIterator __last, bidirectional_iterator_tag) { 30e78f53d1SNikolas Klauser while (__first != __last) { 31e78f53d1SNikolas Klauser if (__first == --__last) 32e78f53d1SNikolas Klauser break; 33e78f53d1SNikolas Klauser _IterOps<_AlgPolicy>::iter_swap(__first, __last); 34e78f53d1SNikolas Klauser ++__first; 35e78f53d1SNikolas Klauser } 36e78f53d1SNikolas Klauser } 37e78f53d1SNikolas Klauser 38e78f53d1SNikolas Klauser template <class _AlgPolicy, class _RandomAccessIterator> 39e78f53d1SNikolas Klauser inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 void 40e78f53d1SNikolas Klauser __reverse_impl(_RandomAccessIterator __first, _RandomAccessIterator __last, random_access_iterator_tag) { 41e78f53d1SNikolas Klauser if (__first != __last) 42e78f53d1SNikolas Klauser for (; __first < --__last; ++__first) 43e78f53d1SNikolas Klauser _IterOps<_AlgPolicy>::iter_swap(__first, __last); 44e78f53d1SNikolas Klauser } 45e78f53d1SNikolas Klauser 46e78f53d1SNikolas Klauser template <class _AlgPolicy, class _BidirectionalIterator, class _Sentinel> 47e78f53d1SNikolas Klauser _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 void __reverse(_BidirectionalIterator __first, _Sentinel __last) { 48e78f53d1SNikolas Klauser using _IterCategory = typename _IterOps<_AlgPolicy>::template __iterator_category<_BidirectionalIterator>; 49e78f53d1SNikolas Klauser std::__reverse_impl<_AlgPolicy>(std::move(__first), std::move(__last), _IterCategory()); 50e78f53d1SNikolas Klauser } 51e78f53d1SNikolas Klauser 52e78f53d1SNikolas Klauser template <class _BidirectionalIterator> 53e78f53d1SNikolas Klauser inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 void 54e78f53d1SNikolas Klauser reverse(_BidirectionalIterator __first, _BidirectionalIterator __last) { 55e78f53d1SNikolas Klauser std::__reverse<_ClassicAlgPolicy>(std::move(__first), std::move(__last)); 56e78f53d1SNikolas Klauser } 57e78f53d1SNikolas Klauser 58e78f53d1SNikolas Klauser _LIBCPP_END_NAMESPACE_STD 59e78f53d1SNikolas Klauser 60e78f53d1SNikolas Klauser _LIBCPP_POP_MACROS 61e78f53d1SNikolas Klauser 62*ce777190SNikolas Klauser #endif // _LIBCPP___CXX03___ALGORITHM_REVERSE_H 63