v1/__algorithm/ranges_rotate.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_H
0010 #define _LIBCPP___ALGORITHM_RANGES_ROTATE_H
0011
0012 #include <__algorithm/iterator_operations.h>
0013 #include <__algorithm/ranges_iterator_concept.h>
0014 #include <__algorithm/rotate.h>
0015 #include <__config>
0016 #include <__iterator/concepts.h>
0017 #include <__iterator/iterator_traits.h>
0018 #include <__iterator/permutable.h>
0019 #include <__ranges/access.h>
0020 #include <__ranges/concepts.h>
0021 #include <__ranges/subrange.h>
0022 #include <__utility/move.h>
0023
0024 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
0025 #  pragma GCC system_header
0026 #endif
0027
0028 _LIBCPP_PUSH_MACROS
0029 #include <__undef_macros>
0030
0031 #if _LIBCPP_STD_VER >= 20
0032
0033 _LIBCPP_BEGIN_NAMESPACE_STD
0034
0035 namespace ranges {
0036 struct __rotate {
0037   template <class _Iter, class _Sent>
0038   _LIBCPP_HIDE_FROM_ABI constexpr static subrange<_Iter> __rotate_fn_impl(_Iter __first, _Iter __middle, _Sent __last) {
0039     auto __ret = std::__rotate<_RangeAlgPolicy>(std::move(__first), std::move(__middle), std::move(__last));
0040     return {std::move(__ret.first), std::move(__ret.second)};
0041   }
0042
0043   template <permutable _Iter, sentinel_for<_Iter> _Sent>
0044   _LIBCPP_HIDE_FROM_ABI constexpr subrange<_Iter> operator()(_Iter __first, _Iter __middle, _Sent __last) const {
0045     return __rotate_fn_impl(std::move(__first), std::move(__middle), std::move(__last));
0046   }
0047
0048   template <forward_range _Range>
0049     requires permutable<iterator_t<_Range>>
0050   _LIBCPP_HIDE_FROM_ABI constexpr borrowed_subrange_t<_Range>
0051   operator()(_Range&& __range, iterator_t<_Range> __middle) const {
0052     return __rotate_fn_impl(ranges::begin(__range), std::move(__middle), ranges::end(__range));
0053   }
0054 };
0055
0056 inline namespace __cpo {
0057 inline constexpr auto rotate = __rotate{};
0058 } // namespace __cpo
0059 } // namespace ranges
0060
0061 _LIBCPP_END_NAMESPACE_STD
0062
0063 #endif // _LIBCPP_STD_VER >= 20
0064
0065 _LIBCPP_POP_MACROS
0066
0067 #endif // _LIBCPP___ALGORITHM_RANGES_ROTATE_H