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 _LIBCPP_PUSH_MACROS 26 #include <__undef_macros> 27 28 #if _LIBCPP_STD_VER >= 20 29 30 _LIBCPP_BEGIN_NAMESPACE_STD 31 32 namespace ranges { 33 34 template <class _InIter, class _OutIter> 35 using rotate_copy_result = in_out_result<_InIter, _OutIter>; 36 37 namespace __rotate_copy { 38 struct __fn { 39 template <forward_iterator _InIter, sentinel_for<_InIter> _Sent, weakly_incrementable _OutIter> 40 requires indirectly_copyable<_InIter, _OutIter> 41 _LIBCPP_HIDE_FROM_ABI constexpr rotate_copy_result<_InIter, _OutIter> operator__fn42 operator()(_InIter __first, _InIter __middle, _Sent __last, _OutIter __result) const { 43 auto __res1 = ranges::copy(__middle, __last, std::move(__result)); 44 auto __res2 = ranges::copy(__first, __middle, std::move(__res1.out)); 45 return {std::move(__res1.in), std::move(__res2.out)}; 46 } 47 48 template <forward_range _Range, weakly_incrementable _OutIter> 49 requires indirectly_copyable<iterator_t<_Range>, _OutIter> 50 _LIBCPP_HIDE_FROM_ABI constexpr rotate_copy_result<borrowed_iterator_t<_Range>, _OutIter> operator__fn51 operator()(_Range&& __range, iterator_t<_Range> __middle, _OutIter __result) const { 52 return (*this)(ranges::begin(__range), std::move(__middle), ranges::end(__range), std::move(__result)); 53 } 54 }; 55 } // namespace __rotate_copy 56 57 inline namespace __cpo { 58 inline constexpr auto rotate_copy = __rotate_copy::__fn{}; 59 } // namespace __cpo 60 } // namespace ranges 61 62 _LIBCPP_END_NAMESPACE_STD 63 64 #endif // _LIBCPP_STD_VER >= 20 65 66 _LIBCPP_POP_MACROS 67 68 #endif // _LIBCPP___ALGORITHM_RANGES_ROTATE_COPY_H 69