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_RANGES_SWAP_RANGES_H
10 #define _LIBCPP___ALGORITHM_RANGES_SWAP_RANGES_H
11 
12 #include <__algorithm/in_in_result.h>
13 #include <__algorithm/iterator_operations.h>
14 #include <__algorithm/swap_ranges.h>
15 #include <__config>
16 #include <__iterator/concepts.h>
17 #include <__iterator/iter_swap.h>
18 #include <__ranges/access.h>
19 #include <__ranges/concepts.h>
20 #include <__ranges/dangling.h>
21 #include <__utility/move.h>
22 
23 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
24 #  pragma GCC system_header
25 #endif
26 
27 #if _LIBCPP_STD_VER > 17
28 
29 _LIBCPP_BEGIN_NAMESPACE_STD
30 
31 namespace ranges {
32 
33 template <class _I1, class _I2>
34 using swap_ranges_result = in_in_result<_I1, _I2>;
35 
36 namespace __swap_ranges {
37 struct __fn {
38   template <input_iterator _I1, sentinel_for<_I1> _S1,
39             input_iterator _I2, sentinel_for<_I2> _S2>
40     requires indirectly_swappable<_I1, _I2>
41   _LIBCPP_HIDE_FROM_ABI constexpr swap_ranges_result<_I1, _I2>
operator__fn42   operator()(_I1 __first1, _S1 __last1, _I2 __first2, _S2 __last2) const {
43     auto __ret = std::__swap_ranges<_RangeAlgPolicy>(
44         std::move(__first1), std::move(__last1), std::move(__first2), std::move(__last2));
45     return {std::move(__ret.first), std::move(__ret.second)};
46   }
47 
48   template <input_range _R1, input_range _R2>
49     requires indirectly_swappable<iterator_t<_R1>, iterator_t<_R2>>
50   _LIBCPP_HIDE_FROM_ABI constexpr
51   swap_ranges_result<borrowed_iterator_t<_R1>, borrowed_iterator_t<_R2>>
operator__fn52   operator()(_R1&& __r1, _R2&& __r2) const {
53     return operator()(ranges::begin(__r1), ranges::end(__r1),
54                       ranges::begin(__r2), ranges::end(__r2));
55   }
56 };
57 } // namespace __swap_ranges
58 
59 inline namespace __cpo {
60   inline constexpr auto swap_ranges = __swap_ranges::__fn{};
61 } // namespace __cpo
62 } // namespace ranges
63 
64 _LIBCPP_END_NAMESPACE_STD
65 
66 #endif // _LIBCPP_STD_VER > 17
67 
68 #endif // _LIBCPP___ALGORITHM_RANGES_SWAP_RANGES_H
69