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_PSTL_COUNT_H 10 #define _LIBCPP___ALGORITHM_PSTL_COUNT_H 11 12 #include <__algorithm/count.h> 13 #include <__algorithm/for_each.h> 14 #include <__algorithm/pstl_backend.h> 15 #include <__algorithm/pstl_for_each.h> 16 #include <__algorithm/pstl_frontend_dispatch.h> 17 #include <__atomic/atomic.h> 18 #include <__config> 19 #include <__functional/operations.h> 20 #include <__iterator/iterator_traits.h> 21 #include <__numeric/pstl_transform_reduce.h> 22 #include <__type_traits/enable_if.h> 23 #include <__type_traits/is_execution_policy.h> 24 #include <__type_traits/remove_cvref.h> 25 #include <__utility/move.h> 26 #include <__utility/terminate_on_exception.h> 27 28 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 29 # pragma GCC system_header 30 #endif 31 32 #if !defined(_LIBCPP_HAS_NO_INCOMPLETE_PSTL) && _LIBCPP_STD_VER >= 17 33 34 _LIBCPP_BEGIN_NAMESPACE_STD 35 36 template <class> 37 void __pstl_count_if(); // declaration needed for the frontend dispatch below 38 39 template <class _ExecutionPolicy, 40 class _ForwardIterator, 41 class _Predicate, 42 class _RawPolicy = __remove_cvref_t<_ExecutionPolicy>, 43 enable_if_t<is_execution_policy_v<_RawPolicy>, int> = 0> 44 _LIBCPP_HIDE_FROM_ABI __iter_diff_t<_ForwardIterator> 45 count_if(_ExecutionPolicy&& __policy, _ForwardIterator __first, _ForwardIterator __last, _Predicate __pred) { 46 using __diff_t = __iter_diff_t<_ForwardIterator>; 47 return std::__pstl_frontend_dispatch( 48 _LIBCPP_PSTL_CUSTOMIZATION_POINT(__pstl_count_if), 49 [&](_ForwardIterator __g_first, _ForwardIterator __g_last, _Predicate __g_pred) { 50 return std::transform_reduce( 51 __policy, 52 std::move(__g_first), 53 std::move(__g_last), 54 __diff_t(), 55 std::plus{}, 56 [&](__iter_reference<_ForwardIterator> __element) -> bool { return __g_pred(__element); }); 57 }, 58 std::move(__first), 59 std::move(__last), 60 std::move(__pred)); 61 } 62 63 template <class> 64 void __pstl_count(); // declaration needed for the frontend dispatch below 65 66 template <class _ExecutionPolicy, 67 class _ForwardIterator, 68 class _Tp, 69 class _RawPolicy = __remove_cvref_t<_ExecutionPolicy>, 70 enable_if_t<is_execution_policy_v<_RawPolicy>, int> = 0> 71 _LIBCPP_HIDE_FROM_ABI __iter_diff_t<_ForwardIterator> 72 count(_ExecutionPolicy&& __policy, _ForwardIterator __first, _ForwardIterator __last, const _Tp& __value) { 73 return std::__pstl_frontend_dispatch( 74 _LIBCPP_PSTL_CUSTOMIZATION_POINT(__pstl_count), 75 [&](_ForwardIterator __g_first, _ForwardIterator __g_last, const _Tp& __g_value) { 76 return std::count_if(__policy, __g_first, __g_last, [&](__iter_reference<_ForwardIterator> __v) { 77 return __v == __g_value; 78 }); 79 }, 80 std::move(__first), 81 std::move(__last), 82 __value); 83 } 84 85 _LIBCPP_END_NAMESPACE_STD 86 87 #endif // !defined(_LIBCPP_HAS_NO_INCOMPLETE_PSTL) && _LIBCPP_STD_VER >= 17 88 89 #endif // _LIBCPP___ALGORITHM_PSTL_COUNT_H 90