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