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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-exception6//7//===----------------------------------------------------------------------===//8 9#ifndef _LIBCPP___ALGORITHM_RANGES_SAMPLE_H10#define _LIBCPP___ALGORITHM_RANGES_SAMPLE_H11 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_header28#endif29 30_LIBCPP_PUSH_MACROS31#include <__undef_macros>32 33#if _LIBCPP_STD_VER >= 2034 35_LIBCPP_BEGIN_NAMESPACE_STD36 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 _OutIter43 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 _OutIter53 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 __cpo62} // namespace ranges63 64_LIBCPP_END_NAMESPACE_STD65 66#endif // _LIBCPP_STD_VER >= 2067 68_LIBCPP_POP_MACROS69 70#endif // _LIBCPP___ALGORITHM_RANGES_SAMPLE_H71