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 <__utility/forward.h> 27 #include <__utility/move.h> 28 #include <type_traits> 29 30 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 31 # pragma GCC system_header 32 #endif 33 34 #if _LIBCPP_STD_VER > 17 35 36 _LIBCPP_BEGIN_NAMESPACE_STD 37 38 namespace ranges { 39 namespace __shuffle { 40 41 struct __fn { 42 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 46 _Iter operator()(_Iter __first, _Sent __last, _Gen&& __gen) const { 47 _ClassicGenAdaptor<_Gen> __adapted_gen(__gen); 48 return std::__shuffle<_RangeAlgPolicy>(std::move(__first), std::move(__last), __adapted_gen); 49 } 50 51 template<random_access_range _Range, class _Gen> 52 requires permutable<iterator_t<_Range>> && uniform_random_bit_generator<remove_reference_t<_Gen>> 53 _LIBCPP_HIDE_FROM_ABI 54 borrowed_iterator_t<_Range> operator()(_Range&& __range, _Gen&& __gen) const { 55 return (*this)(ranges::begin(__range), ranges::end(__range), std::forward<_Gen>(__gen)); 56 } 57 58 }; 59 60 } // namespace __shuffle 61 62 inline namespace __cpo { 63 inline constexpr auto shuffle = __shuffle::__fn{}; 64 } // namespace __cpo 65 } // namespace ranges 66 67 _LIBCPP_END_NAMESPACE_STD 68 69 #endif // _LIBCPP_STD_VER > 17 70 71 #endif // _LIBCPP___ALGORITHM_RANGES_SHUFFLE_H 72