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_SWAP_RANGES_H 10*ce777190SNikolas Klauser #define _LIBCPP___CXX03___ALGORITHM_SWAP_RANGES_H 11e78f53d1SNikolas Klauser 1273fbae83SNikolas Klauser #include <__cxx03/__algorithm/iterator_operations.h> 1373fbae83SNikolas Klauser #include <__cxx03/__config> 1473fbae83SNikolas Klauser #include <__cxx03/__utility/move.h> 1573fbae83SNikolas Klauser #include <__cxx03/__utility/pair.h> 16e78f53d1SNikolas Klauser 17e78f53d1SNikolas Klauser #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 18e78f53d1SNikolas Klauser # pragma GCC system_header 19e78f53d1SNikolas Klauser #endif 20e78f53d1SNikolas Klauser 21e78f53d1SNikolas Klauser _LIBCPP_PUSH_MACROS 2273fbae83SNikolas Klauser #include <__cxx03/__undef_macros> 23e78f53d1SNikolas Klauser 24e78f53d1SNikolas Klauser _LIBCPP_BEGIN_NAMESPACE_STD 25e78f53d1SNikolas Klauser 26e78f53d1SNikolas Klauser // 2+2 iterators: the shorter size will be used. 27e78f53d1SNikolas Klauser template <class _AlgPolicy, class _ForwardIterator1, class _Sentinel1, class _ForwardIterator2, class _Sentinel2> 28e78f53d1SNikolas Klauser _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 pair<_ForwardIterator1, _ForwardIterator2> 29e78f53d1SNikolas Klauser __swap_ranges(_ForwardIterator1 __first1, _Sentinel1 __last1, _ForwardIterator2 __first2, _Sentinel2 __last2) { 30e78f53d1SNikolas Klauser while (__first1 != __last1 && __first2 != __last2) { 31e78f53d1SNikolas Klauser _IterOps<_AlgPolicy>::iter_swap(__first1, __first2); 32e78f53d1SNikolas Klauser ++__first1; 33e78f53d1SNikolas Klauser ++__first2; 34e78f53d1SNikolas Klauser } 35e78f53d1SNikolas Klauser 36e78f53d1SNikolas Klauser return pair<_ForwardIterator1, _ForwardIterator2>(std::move(__first1), std::move(__first2)); 37e78f53d1SNikolas Klauser } 38e78f53d1SNikolas Klauser 39e78f53d1SNikolas Klauser // 2+1 iterators: size2 >= size1. 40e78f53d1SNikolas Klauser template <class _AlgPolicy, class _ForwardIterator1, class _Sentinel1, class _ForwardIterator2> 41e78f53d1SNikolas Klauser _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 pair<_ForwardIterator1, _ForwardIterator2> 42e78f53d1SNikolas Klauser __swap_ranges(_ForwardIterator1 __first1, _Sentinel1 __last1, _ForwardIterator2 __first2) { 43e78f53d1SNikolas Klauser while (__first1 != __last1) { 44e78f53d1SNikolas Klauser _IterOps<_AlgPolicy>::iter_swap(__first1, __first2); 45e78f53d1SNikolas Klauser ++__first1; 46e78f53d1SNikolas Klauser ++__first2; 47e78f53d1SNikolas Klauser } 48e78f53d1SNikolas Klauser 49e78f53d1SNikolas Klauser return pair<_ForwardIterator1, _ForwardIterator2>(std::move(__first1), std::move(__first2)); 50e78f53d1SNikolas Klauser } 51e78f53d1SNikolas Klauser 52e78f53d1SNikolas Klauser template <class _ForwardIterator1, class _ForwardIterator2> 53e78f53d1SNikolas Klauser inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 _ForwardIterator2 54e78f53d1SNikolas Klauser swap_ranges(_ForwardIterator1 __first1, _ForwardIterator1 __last1, _ForwardIterator2 __first2) { 55e78f53d1SNikolas Klauser return std::__swap_ranges<_ClassicAlgPolicy>(std::move(__first1), std::move(__last1), std::move(__first2)).second; 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_SWAP_RANGES_H 63