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_SAMPLE_H
10#define _LIBCPP___ALGORITHM_RANGES_SAMPLE_H
11
12#include <__algorithm/iterator_operations.h>
13#include <__algorithm/sample.h>
14#include <__algorithm/uniform_random_bit_generator_adaptor.h>
15#include <__config>
16#include <__iterator/concepts.h>
17#include <__iterator/incrementable_traits.h>
18#include <__iterator/iterator_traits.h>
19#include <__random/uniform_random_bit_generator.h>
20#include <__ranges/access.h>
21#include <__ranges/concepts.h>
22#include <__type_traits/remove_reference.h>
23#include <__utility/forward.h>
24#include <__utility/move.h>
25
26#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
27# pragma GCC system_header
28#endif
29
30_LIBCPP_PUSH_MACROS
31#include <__undef_macros>
32
33#if _LIBCPP_STD_VER >= 20
34
35_LIBCPP_BEGIN_NAMESPACE_STD
36
37namespace ranges {
38struct __sample {
39 template <input_iterator _Iter, sentinel_for<_Iter> _Sent, weakly_incrementable _OutIter, class _Gen>
40 requires(forward_iterator<_Iter> || random_access_iterator<_OutIter>) && indirectly_copyable<_Iter, _OutIter> &&
41 uniform_random_bit_generator<remove_reference_t<_Gen>>
42 _LIBCPP_HIDE_FROM_ABI _OutIter
43 operator()(_Iter __first, _Sent __last, _OutIter __out_first, iter_difference_t<_Iter> __n, _Gen&& __gen) const {
44 _ClassicGenAdaptor<_Gen> __adapted_gen(__gen);
45 return std::__sample<_RangeAlgPolicy>(
46 std::move(__first), std::move(__last), std::move(__out_first), __n, __adapted_gen);
47 }
48
49 template <input_range _Range, weakly_incrementable _OutIter, class _Gen>
50 requires(forward_range<_Range> || random_access_iterator<_OutIter>) &&
51 indirectly_copyable<iterator_t<_Range>, _OutIter> && uniform_random_bit_generator<remove_reference_t<_Gen>>
52 _LIBCPP_HIDE_FROM_ABI _OutIter
53 operator()(_Range&& __range, _OutIter __out_first, range_difference_t<_Range> __n, _Gen&& __gen) const {
54 return (*this)(
55 ranges::begin(__range), ranges::end(__range), std::move(__out_first), __n, std::forward<_Gen>(__gen));
56 }
57};
58
59inline namespace __cpo {
60inline constexpr auto sample = __sample{};
61} // namespace __cpo
62} // namespace ranges
63
64_LIBCPP_END_NAMESPACE_STD
65
66#endif // _LIBCPP_STD_VER >= 20
67
68_LIBCPP_POP_MACROS
69
70#endif // _LIBCPP___ALGORITHM_RANGES_SAMPLE_H
71