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_PUSH_MACROS
22#include <__undef_macros>
23
24_LIBCPP_BEGIN_NAMESPACE_STD
25
26// 2+2 iterators: the shorter size will be used.
27template <class _AlgPolicy, class _ForwardIterator1, class _Sentinel1, class _ForwardIterator2, class _Sentinel2>
28_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 pair<_ForwardIterator1, _ForwardIterator2>
29__swap_ranges(_ForwardIterator1 __first1, _Sentinel1 __last1, _ForwardIterator2 __first2, _Sentinel2 __last2) {
30 while (__first1 != __last1 && __first2 != __last2) {
31 _IterOps<_AlgPolicy>::iter_swap(__first1, __first2);
32 ++__first1;
33 ++__first2;
34 }
35
36 return pair<_ForwardIterator1, _ForwardIterator2>(std::move(__first1), std::move(__first2));
37}
38
39// 2+1 iterators: size2 >= size1.
40template <class _AlgPolicy, class _ForwardIterator1, class _Sentinel1, class _ForwardIterator2>
41_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 pair<_ForwardIterator1, _ForwardIterator2>
42__swap_ranges(_ForwardIterator1 __first1, _Sentinel1 __last1, _ForwardIterator2 __first2) {
43 while (__first1 != __last1) {
44 _IterOps<_AlgPolicy>::iter_swap(__first1, __first2);
45 ++__first1;
46 ++__first2;
47 }
48
49 return pair<_ForwardIterator1, _ForwardIterator2>(std::move(__first1), std::move(__first2));
50}
51
52template <class _ForwardIterator1, class _ForwardIterator2>
53inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 _ForwardIterator2
54swap_ranges(_ForwardIterator1 __first1, _ForwardIterator1 __last1, _ForwardIterator2 __first2) {
55 return std::__swap_ranges<_ClassicAlgPolicy>(std::move(__first1), std::move(__last1), std::move(__first2)).second;
56}
57
58_LIBCPP_END_NAMESPACE_STD
59
60_LIBCPP_POP_MACROS
61
62#endif // _LIBCPP___ALGORITHM_SWAP_RANGES_H
63