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