v1/__algorithm/ranges_rotate_copy.h

0001 //===----------------------------------------------------------------------===//
0002 //
0003 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
0004 // See https://llvm.org/LICENSE.txt for license information.
0005 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
0006 //
0007 //===----------------------------------------------------------------------===//
0008
0009 #ifndef _LIBCPP___ALGORITHM_RANGES_ROTATE_COPY_H
0010 #define _LIBCPP___ALGORITHM_RANGES_ROTATE_COPY_H
0011
0012 #include <__algorithm/in_out_result.h>
0013 #include <__algorithm/ranges_copy.h>
0014 #include <__config>
0015 #include <__iterator/concepts.h>
0016 #include <__ranges/access.h>
0017 #include <__ranges/concepts.h>
0018 #include <__ranges/dangling.h>
0019 #include <__utility/move.h>
0020
0021 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
0022 #  pragma GCC system_header
0023 #endif
0024
0025 _LIBCPP_PUSH_MACROS
0026 #include <__undef_macros>
0027
0028 #if _LIBCPP_STD_VER >= 20
0029
0030 _LIBCPP_BEGIN_NAMESPACE_STD
0031
0032 namespace ranges {
0033
0034 template <class _InIter, class _OutIter>
0035 using rotate_copy_result = in_out_result<_InIter, _OutIter>;
0036
0037 struct __rotate_copy {
0038   template <forward_iterator _InIter, sentinel_for<_InIter> _Sent, weakly_incrementable _OutIter>
0039     requires indirectly_copyable<_InIter, _OutIter>
0040   _LIBCPP_HIDE_FROM_ABI constexpr rotate_copy_result<_InIter, _OutIter>
0041   operator()(_InIter __first, _InIter __middle, _Sent __last, _OutIter __result) const {
0042     auto __res1 = ranges::copy(__middle, __last, std::move(__result));
0043     auto __res2 = ranges::copy(__first, __middle, std::move(__res1.out));
0044     return {std::move(__res1.in), std::move(__res2.out)};
0045   }
0046
0047   template <forward_range _Range, weakly_incrementable _OutIter>
0048     requires indirectly_copyable<iterator_t<_Range>, _OutIter>
0049   _LIBCPP_HIDE_FROM_ABI constexpr rotate_copy_result<borrowed_iterator_t<_Range>, _OutIter>
0050   operator()(_Range&& __range, iterator_t<_Range> __middle, _OutIter __result) const {
0051     return (*this)(ranges::begin(__range), std::move(__middle), ranges::end(__range), std::move(__result));
0052   }
0053 };
0054
0055 inline namespace __cpo {
0056 inline constexpr auto rotate_copy = __rotate_copy{};
0057 } // namespace __cpo
0058 } // namespace ranges
0059
0060 _LIBCPP_END_NAMESPACE_STD
0061
0062 #endif // _LIBCPP_STD_VER >= 20
0063
0064 _LIBCPP_POP_MACROS
0065
0066 #endif // _LIBCPP___ALGORITHM_RANGES_ROTATE_COPY_H