diff options
Diffstat (limited to 'contrib/llvm-project/libcxx/include/__algorithm/sample.h')
| -rw-r--r-- | contrib/llvm-project/libcxx/include/__algorithm/sample.h | 48 |
1 files changed, 28 insertions, 20 deletions
diff --git a/contrib/llvm-project/libcxx/include/__algorithm/sample.h b/contrib/llvm-project/libcxx/include/__algorithm/sample.h index e04466a08d5a..f403ba612580 100644 --- a/contrib/llvm-project/libcxx/include/__algorithm/sample.h +++ b/contrib/llvm-project/libcxx/include/__algorithm/sample.h @@ -9,12 +9,14 @@ #ifndef _LIBCPP___ALGORITHM_SAMPLE_H #define _LIBCPP___ALGORITHM_SAMPLE_H +#include <__algorithm/iterator_operations.h> #include <__algorithm/min.h> #include <__assert> #include <__config> #include <__iterator/distance.h> #include <__iterator/iterator_traits.h> #include <__random/uniform_int_distribution.h> +#include <__utility/move.h> #include <type_traits> #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) @@ -26,13 +28,14 @@ _LIBCPP_PUSH_MACROS _LIBCPP_BEGIN_NAMESPACE_STD -template <class _PopulationIterator, class _SampleIterator, class _Distance, +template <class _AlgPolicy, + class _PopulationIterator, class _PopulationSentinel, class _SampleIterator, class _Distance, class _UniformRandomNumberGenerator> _LIBCPP_INLINE_VISIBILITY _SampleIterator __sample(_PopulationIterator __first, - _PopulationIterator __last, _SampleIterator __output_iter, + _PopulationSentinel __last, _SampleIterator __output_iter, _Distance __n, - _UniformRandomNumberGenerator & __g, + _UniformRandomNumberGenerator& __g, input_iterator_tag) { _Distance __k = 0; @@ -47,15 +50,16 @@ _SampleIterator __sample(_PopulationIterator __first, return __output_iter + _VSTD::min(__n, __k); } -template <class _PopulationIterator, class _SampleIterator, class _Distance, +template <class _AlgPolicy, + class _PopulationIterator, class _PopulationSentinel, class _SampleIterator, class _Distance, class _UniformRandomNumberGenerator> _LIBCPP_INLINE_VISIBILITY _SampleIterator __sample(_PopulationIterator __first, - _PopulationIterator __last, _SampleIterator __output_iter, + _PopulationSentinel __last, _SampleIterator __output_iter, _Distance __n, _UniformRandomNumberGenerator& __g, forward_iterator_tag) { - _Distance __unsampled_sz = _VSTD::distance(__first, __last); + _Distance __unsampled_sz = _IterOps<_AlgPolicy>::distance(__first, __last); for (__n = _VSTD::min(__n, __unsampled_sz); __n != 0; ++__first) { _Distance __r = uniform_int_distribution<_Distance>(0, --__unsampled_sz)(__g); if (__r < __n) { @@ -66,24 +70,22 @@ _SampleIterator __sample(_PopulationIterator __first, return __output_iter; } -template <class _PopulationIterator, class _SampleIterator, class _Distance, +template <class _AlgPolicy, + class _PopulationIterator, class _PopulationSentinel, class _SampleIterator, class _Distance, class _UniformRandomNumberGenerator> _LIBCPP_INLINE_VISIBILITY _SampleIterator __sample(_PopulationIterator __first, - _PopulationIterator __last, _SampleIterator __output_iter, + _PopulationSentinel __last, _SampleIterator __output_iter, _Distance __n, _UniformRandomNumberGenerator& __g) { - typedef typename iterator_traits<_PopulationIterator>::iterator_category - _PopCategory; - typedef typename iterator_traits<_PopulationIterator>::difference_type - _Difference; - static_assert(__is_cpp17_forward_iterator<_PopulationIterator>::value || - __is_cpp17_random_access_iterator<_SampleIterator>::value, - "SampleIterator must meet the requirements of RandomAccessIterator"); - typedef typename common_type<_Distance, _Difference>::type _CommonType; _LIBCPP_ASSERT(__n >= 0, "N must be a positive number."); - return _VSTD::__sample( - __first, __last, __output_iter, _CommonType(__n), - __g, _PopCategory()); + + using _PopIterCategory = typename _IterOps<_AlgPolicy>::template __iterator_category<_PopulationIterator>; + using _Difference = typename _IterOps<_AlgPolicy>::template __difference_type<_PopulationIterator>; + using _CommonType = typename common_type<_Distance, _Difference>::type; + + return std::__sample<_AlgPolicy>( + std::move(__first), std::move(__last), std::move(__output_iter), _CommonType(__n), + __g, _PopIterCategory()); } #if _LIBCPP_STD_VER > 14 @@ -93,8 +95,14 @@ inline _LIBCPP_INLINE_VISIBILITY _SampleIterator sample(_PopulationIterator __first, _PopulationIterator __last, _SampleIterator __output_iter, _Distance __n, _UniformRandomNumberGenerator&& __g) { - return _VSTD::__sample(__first, __last, __output_iter, __n, __g); + static_assert(__is_cpp17_forward_iterator<_PopulationIterator>::value || + __is_cpp17_random_access_iterator<_SampleIterator>::value, + "SampleIterator must meet the requirements of RandomAccessIterator"); + + return std::__sample<_ClassicAlgPolicy>( + std::move(__first), std::move(__last), std::move(__output_iter), __n, __g); } + #endif // _LIBCPP_STD_VER > 14 _LIBCPP_END_NAMESPACE_STD |