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___ALGORITHM_SWAP_RANGES_H 10 #define _LIBCPP___ALGORITHM_SWAP_RANGES_H 11 12 #include <__algorithm/iterator_operations.h> 13 #include <__config> 14 #include <__utility/move.h> 15 #include <__utility/pair.h> 16 17 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 18 # pragma GCC system_header 19 #endif 20 21 _LIBCPP_BEGIN_NAMESPACE_STD 22 23 // 2+2 iterators: the shorter size will be used. 24 template <class _AlgPolicy, class _ForwardIterator1, class _Sentinel1, class _ForwardIterator2, class _Sentinel2> 25 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 pair<_ForwardIterator1, _ForwardIterator2> 26 __swap_ranges(_ForwardIterator1 __first1, _Sentinel1 __last1, _ForwardIterator2 __first2, _Sentinel2 __last2) { 27 while (__first1 != __last1 && __first2 != __last2) { 28 _IterOps<_AlgPolicy>::iter_swap(__first1, __first2); 29 ++__first1; 30 ++__first2; 31 } 32 33 return pair<_ForwardIterator1, _ForwardIterator2>(std::move(__first1), std::move(__first2)); 34 } 35 36 // 2+1 iterators: size2 >= size1. 37 template <class _AlgPolicy, class _ForwardIterator1, class _Sentinel1, class _ForwardIterator2> 38 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 pair<_ForwardIterator1, _ForwardIterator2> 39 __swap_ranges(_ForwardIterator1 __first1, _Sentinel1 __last1, _ForwardIterator2 __first2) { 40 while (__first1 != __last1) { 41 _IterOps<_AlgPolicy>::iter_swap(__first1, __first2); 42 ++__first1; 43 ++__first2; 44 } 45 46 return pair<_ForwardIterator1, _ForwardIterator2>(std::move(__first1), std::move(__first2)); 47 } 48 49 template <class _ForwardIterator1, class _ForwardIterator2> 50 inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 _ForwardIterator2 51 swap_ranges(_ForwardIterator1 __first1, _ForwardIterator1 __last1, _ForwardIterator2 __first2) { 52 return std::__swap_ranges<_ClassicAlgPolicy>(std::move(__first1), std::move(__last1), std::move(__first2)).second; 53 } 54 55 _LIBCPP_END_NAMESPACE_STD 56 57 #endif // _LIBCPP___ALGORITHM_SWAP_RANGES_H 58