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_SHUFFLE_H
10#define _LIBCPP___ALGORITHM_RANGES_SHUFFLE_H
11
12#include <__algorithm/iterator_operations.h>
13#include <__algorithm/shuffle.h>
14#include <__algorithm/uniform_random_bit_generator_adaptor.h>
15#include <__config>
16#include <__functional/invoke.h>
17#include <__functional/ranges_operations.h>
18#include <__iterator/concepts.h>
19#include <__iterator/iterator_traits.h>
20#include <__iterator/next.h>
21#include <__iterator/permutable.h>
22#include <__random/uniform_random_bit_generator.h>
23#include <__ranges/access.h>
24#include <__ranges/concepts.h>
25#include <__ranges/dangling.h>
26#include <__type_traits/remove_reference.h>
27#include <__utility/forward.h>
28#include <__utility/move.h>
29
30#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
31# pragma GCC system_header
32#endif
33
34_LIBCPP_PUSH_MACROS
35#include <__undef_macros>
36
37#if _LIBCPP_STD_VER >= 20
38
39_LIBCPP_BEGIN_NAMESPACE_STD
40
41namespace ranges {
42struct __shuffle {
43 template <random_access_iterator _Iter, sentinel_for<_Iter> _Sent, class _Gen>
44 requires permutable<_Iter> && uniform_random_bit_generator<remove_reference_t<_Gen>>
45 _LIBCPP_HIDE_FROM_ABI _Iter operator()(_Iter __first, _Sent __last, _Gen&& __gen) const {
46 _ClassicGenAdaptor<_Gen> __adapted_gen(__gen);
47 return std::__shuffle<_RangeAlgPolicy>(std::move(__first), std::move(__last), __adapted_gen);
48 }
49
50 template <random_access_range _Range, class _Gen>
51 requires permutable<iterator_t<_Range>> && uniform_random_bit_generator<remove_reference_t<_Gen>>
52 _LIBCPP_HIDE_FROM_ABI borrowed_iterator_t<_Range> operator()(_Range&& __range, _Gen&& __gen) const {
53 return (*this)(ranges::begin(__range), ranges::end(__range), std::forward<_Gen>(__gen));
54 }
55};
56
57inline namespace __cpo {
58inline constexpr auto shuffle = __shuffle{};
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_SHUFFLE_H
69