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1 //===----------------------------------------------------------------------===//
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2 //
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3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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4 // See https://llvm.org/LICENSE.txt for license information.
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5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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6 //
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7 //===----------------------------------------------------------------------===//
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8
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9 #ifndef _LIBCPP___ALGORITHM_RANGES_SWAP_RANGES_H
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10 #define _LIBCPP___ALGORITHM_RANGES_SWAP_RANGES_H
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11
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12 #include <__algorithm/in_in_result.h>
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13 #include <__algorithm/iterator_operations.h>
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14 #include <__algorithm/swap_ranges.h>
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15 #include <__config>
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16 #include <__iterator/concepts.h>
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17 #include <__iterator/iter_swap.h>
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18 #include <__ranges/access.h>
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19 #include <__ranges/concepts.h>
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20 #include <__ranges/dangling.h>
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21 #include <__utility/move.h>
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22
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23 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
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24 # pragma GCC system_header
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25 #endif
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26
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27 #if _LIBCPP_STD_VER > 17
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28
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29 _LIBCPP_BEGIN_NAMESPACE_STD
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30
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31 namespace ranges {
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32
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33 template <class _I1, class _I2>
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34 using swap_ranges_result = in_in_result<_I1, _I2>;
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35
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36 namespace __swap_ranges {
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37 struct __fn {
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38 template <input_iterator _I1, sentinel_for<_I1> _S1,
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39 input_iterator _I2, sentinel_for<_I2> _S2>
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40 requires indirectly_swappable<_I1, _I2>
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41 _LIBCPP_HIDE_FROM_ABI constexpr swap_ranges_result<_I1, _I2>
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42 operator()(_I1 __first1, _S1 __last1, _I2 __first2, _S2 __last2) const {
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43 auto __ret = std::__swap_ranges<_RangeAlgPolicy>(
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44 std::move(__first1), std::move(__last1), std::move(__first2), std::move(__last2));
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45 return {std::move(__ret.first), std::move(__ret.second)};
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46 }
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47
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48 template <input_range _R1, input_range _R2>
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49 requires indirectly_swappable<iterator_t<_R1>, iterator_t<_R2>>
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50 _LIBCPP_HIDE_FROM_ABI constexpr
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51 swap_ranges_result<borrowed_iterator_t<_R1>, borrowed_iterator_t<_R2>>
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52 operator()(_R1&& __r1, _R2&& __r2) const {
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53 return operator()(ranges::begin(__r1), ranges::end(__r1),
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54 ranges::begin(__r2), ranges::end(__r2));
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55 }
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56 };
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57 } // namespace __swap_ranges
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58
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59 inline namespace __cpo {
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60 inline constexpr auto swap_ranges = __swap_ranges::__fn{};
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61 } // namespace __cpo
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62 } // namespace ranges
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63
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64 _LIBCPP_END_NAMESPACE_STD
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65
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66 #endif // _LIBCPP_STD_VER > 17
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67
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68 #endif // _LIBCPP___ALGORITHM_RANGES_SWAP_RANGES_H
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