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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_ROTATE_COPY_H
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10 #define _LIBCPP___ALGORITHM_RANGES_ROTATE_COPY_H
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11
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12 #include <__algorithm/in_out_result.h>
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13 #include <__algorithm/ranges_copy.h>
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14 #include <__config>
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15 #include <__iterator/concepts.h>
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16 #include <__iterator/reverse_iterator.h>
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17 #include <__ranges/access.h>
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18 #include <__ranges/concepts.h>
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19 #include <__ranges/dangling.h>
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20 #include <__utility/move.h>
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21
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22 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
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23 # pragma GCC system_header
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24 #endif
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25
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252
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26 #if _LIBCPP_STD_VER >= 20
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236
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27
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28 _LIBCPP_BEGIN_NAMESPACE_STD
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29
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30 namespace ranges {
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31
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32 template <class _InIter, class _OutIter>
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33 using rotate_copy_result = in_out_result<_InIter, _OutIter>;
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34
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35 namespace __rotate_copy {
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36 struct __fn {
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37 template <bidirectional_iterator _InIter, sentinel_for<_InIter> _Sent, weakly_incrementable _OutIter>
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38 requires indirectly_copyable<_InIter, _OutIter>
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252
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39 _LIBCPP_HIDE_FROM_ABI constexpr rotate_copy_result<_InIter, _OutIter>
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236
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40 operator()(_InIter __first, _InIter __middle, _Sent __last, _OutIter __result) const {
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41 auto __res1 = ranges::copy(__middle, __last, std::move(__result));
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42 auto __res2 = ranges::copy(__first, __middle, std::move(__res1.out));
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43 return {std::move(__res1.in), std::move(__res2.out)};
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44 }
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45
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46 template <bidirectional_range _Range, weakly_incrementable _OutIter>
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47 requires indirectly_copyable<iterator_t<_Range>, _OutIter>
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252
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48 _LIBCPP_HIDE_FROM_ABI constexpr rotate_copy_result<borrowed_iterator_t<_Range>, _OutIter>
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236
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49 operator()(_Range&& __range, iterator_t<_Range> __middle, _OutIter __result) const {
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50 return (*this)(ranges::begin(__range), std::move(__middle), ranges::end(__range), std::move(__result));
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51 }
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52 };
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53 } // namespace __rotate_copy
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54
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55 inline namespace __cpo {
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252
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56 inline constexpr auto rotate_copy = __rotate_copy::__fn{};
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236
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57 } // namespace __cpo
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58 } // namespace ranges
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59
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60 _LIBCPP_END_NAMESPACE_STD
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61
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252
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62 #endif // _LIBCPP_STD_VER >= 20
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236
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63
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64 #endif // _LIBCPP___ALGORITHM_RANGES_ROTATE_COPY_H
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