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_LIBCPP_PUSH_MACROS
29#include <__undef_macros>
30
31#if _LIBCPP_STD_VER >= 20
32
33_LIBCPP_BEGIN_NAMESPACE_STD
34
35namespace ranges {
36struct __rotate {
37  template <class _Iter, class _Sent>
38  _LIBCPP_HIDE_FROM_ABI constexpr static subrange<_Iter> __rotate_fn_impl(_Iter __first, _Iter __middle, _Sent __last) {
39    auto __ret = std::__rotate<_RangeAlgPolicy>(std::move(__first), std::move(__middle), std::move(__last));
40    return {std::move(__ret.first), std::move(__ret.second)};
41  }
42
43  template <permutable _Iter, sentinel_for<_Iter> _Sent>
44  _LIBCPP_HIDE_FROM_ABI constexpr subrange<_Iter> operator()(_Iter __first, _Iter __middle, _Sent __last) const {
45    return __rotate_fn_impl(std::move(__first), std::move(__middle), std::move(__last));
46  }
47
48  template <forward_range _Range>
49    requires permutable<iterator_t<_Range>>
50  _LIBCPP_HIDE_FROM_ABI constexpr borrowed_subrange_t<_Range>
51  operator()(_Range&& __range, iterator_t<_Range> __middle) const {
52    return __rotate_fn_impl(ranges::begin(__range), std::move(__middle), ranges::end(__range));
53  }
54};
55
56inline namespace __cpo {
57inline constexpr auto rotate = __rotate{};
58} // namespace __cpo
59} // namespace ranges
60
61_LIBCPP_END_NAMESPACE_STD
62
63#endif // _LIBCPP_STD_VER >= 20
64
65_LIBCPP_POP_MACROS
66
67#endif // _LIBCPP___ALGORITHM_RANGES_ROTATE_H