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1 //===----------------------------------------------------------------------===//
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2 //
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3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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4 // See https://llvm.org/LICENSE.txt for license information.
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5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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6 //
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7 //===----------------------------------------------------------------------===//
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8
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9 #ifndef _LIBCPP___ALGORITHM_RANGES_SHUFFLE_H
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10 #define _LIBCPP___ALGORITHM_RANGES_SHUFFLE_H
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11
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12 #include <__algorithm/iterator_operations.h>
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13 #include <__algorithm/shuffle.h>
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14 #include <__algorithm/uniform_random_bit_generator_adaptor.h>
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15 #include <__config>
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16 #include <__functional/invoke.h>
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17 #include <__functional/ranges_operations.h>
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18 #include <__iterator/concepts.h>
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19 #include <__iterator/iterator_traits.h>
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20 #include <__iterator/next.h>
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21 #include <__iterator/permutable.h>
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22 #include <__random/uniform_random_bit_generator.h>
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23 #include <__ranges/access.h>
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24 #include <__ranges/concepts.h>
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25 #include <__ranges/dangling.h>
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252
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26 #include <__type_traits/remove_reference.h>
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236
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27 #include <__utility/forward.h>
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28 #include <__utility/move.h>
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29
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30 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
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31 # pragma GCC system_header
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32 #endif
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33
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252
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34 #if _LIBCPP_STD_VER >= 20
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236
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35
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36 _LIBCPP_BEGIN_NAMESPACE_STD
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37
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38 namespace ranges {
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39 namespace __shuffle {
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40
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41 struct __fn {
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42 template <random_access_iterator _Iter, sentinel_for<_Iter> _Sent, class _Gen>
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252
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43 requires permutable<_Iter> && uniform_random_bit_generator<remove_reference_t<_Gen>>
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44 _LIBCPP_HIDE_FROM_ABI _Iter operator()(_Iter __first, _Sent __last, _Gen&& __gen) const {
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236
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45 _ClassicGenAdaptor<_Gen> __adapted_gen(__gen);
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46 return std::__shuffle<_RangeAlgPolicy>(std::move(__first), std::move(__last), __adapted_gen);
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47 }
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48
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252
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49 template <random_access_range _Range, class _Gen>
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50 requires permutable<iterator_t<_Range>> && uniform_random_bit_generator<remove_reference_t<_Gen>>
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51 _LIBCPP_HIDE_FROM_ABI borrowed_iterator_t<_Range> operator()(_Range&& __range, _Gen&& __gen) const {
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236
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52 return (*this)(ranges::begin(__range), ranges::end(__range), std::forward<_Gen>(__gen));
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53 }
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54 };
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55
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56 } // namespace __shuffle
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57
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58 inline namespace __cpo {
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252
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59 inline constexpr auto shuffle = __shuffle::__fn{};
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236
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60 } // namespace __cpo
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61 } // namespace ranges
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62
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63 _LIBCPP_END_NAMESPACE_STD
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64
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252
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65 #endif // _LIBCPP_STD_VER >= 20
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236
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66
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67 #endif // _LIBCPP___ALGORITHM_RANGES_SHUFFLE_H
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