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_AFTER_CXX17 26 pair<_ForwardIterator1, _ForwardIterator2> 27 __swap_ranges(_ForwardIterator1 __first1, _Sentinel1 __last1, _ForwardIterator2 __first2, _Sentinel2 __last2) { 28 while (__first1 != __last1 && __first2 != __last2) { 29 _IterOps<_AlgPolicy>::iter_swap(__first1, __first2); 30 ++__first1; 31 ++__first2; 32 } 33 34 return pair<_ForwardIterator1, _ForwardIterator2>(std::move(__first1), std::move(__first2)); 35 } 36 37 // 2+1 iterators: size2 >= size1. 38 template <class _AlgPolicy, class _ForwardIterator1, class _Sentinel1, class _ForwardIterator2> 39 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_AFTER_CXX17 40 pair<_ForwardIterator1, _ForwardIterator2> 41 __swap_ranges(_ForwardIterator1 __first1, _Sentinel1 __last1, _ForwardIterator2 __first2) { 42 while (__first1 != __last1) { 43 _IterOps<_AlgPolicy>::iter_swap(__first1, __first2); 44 ++__first1; 45 ++__first2; 46 } 47 48 return pair<_ForwardIterator1, _ForwardIterator2>(std::move(__first1), std::move(__first2)); 49 } 50 51 template <class _ForwardIterator1, class _ForwardIterator2> 52 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 _ForwardIterator2 53 swap_ranges(_ForwardIterator1 __first1, _ForwardIterator1 __last1, _ForwardIterator2 __first2) { 54 return std::__swap_ranges<_ClassicAlgPolicy>( 55 std::move(__first1), std::move(__last1), std::move(__first2)).second; 56 } 57 58 _LIBCPP_END_NAMESPACE_STD 59 60 #endif // _LIBCPP___ALGORITHM_SWAP_RANGES_H 61