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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_H
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10 #define _LIBCPP___ALGORITHM_RANGES_ROTATE_H
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11
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12 #include <__algorithm/iterator_operations.h>
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13 #include <__algorithm/ranges_iterator_concept.h>
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14 #include <__algorithm/rotate.h>
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15 #include <__config>
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16 #include <__iterator/concepts.h>
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17 #include <__iterator/iterator_traits.h>
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18 #include <__iterator/permutable.h>
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19 #include <__ranges/access.h>
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20 #include <__ranges/concepts.h>
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21 #include <__ranges/subrange.h>
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22 #include <__utility/move.h>
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23
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24 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
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25 # pragma GCC system_header
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26 #endif
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27
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28 #if _LIBCPP_STD_VER > 17
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29
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30 _LIBCPP_BEGIN_NAMESPACE_STD
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31
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32 namespace ranges {
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33 namespace __rotate {
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34
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35 struct __fn {
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36
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37 template <class _Iter, class _Sent>
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38 _LIBCPP_HIDE_FROM_ABI constexpr
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39 static subrange<_Iter> __rotate_fn_impl(_Iter __first, _Iter __middle, _Sent __last) {
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40 auto __ret = std::__rotate<_RangeAlgPolicy>(
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41 std::move(__first), std::move(__middle), std::move(__last));
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42 return {std::move(__ret.first), std::move(__ret.second)};
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43 }
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44
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45 template <permutable _Iter, sentinel_for<_Iter> _Sent>
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46 _LIBCPP_HIDE_FROM_ABI constexpr
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47 subrange<_Iter> operator()(_Iter __first, _Iter __middle, _Sent __last) const {
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48 return __rotate_fn_impl(std::move(__first), std::move(__middle), std::move(__last));
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49 }
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50
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51 template <forward_range _Range>
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52 requires permutable<iterator_t<_Range>>
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53 _LIBCPP_HIDE_FROM_ABI constexpr
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54 borrowed_subrange_t<_Range> operator()(_Range&& __range, iterator_t<_Range> __middle) const {
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55 return __rotate_fn_impl(ranges::begin(__range), std::move(__middle), ranges::end(__range));
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56 }
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57
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58 };
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59
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60 } // namespace __rotate
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61
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62 inline namespace __cpo {
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63 inline constexpr auto rotate = __rotate::__fn{};
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64 } // namespace __cpo
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65 } // namespace ranges
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66
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67 _LIBCPP_END_NAMESPACE_STD
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68
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69 #endif // _LIBCPP_STD_VER > 17
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70
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71 #endif // _LIBCPP___ALGORITHM_RANGES_ROTATE_H
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