| //===----------------------------------------------------------------------===// |
| // |
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| // See https://llvm.org/LICENSE.txt for license information. |
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #ifndef _LIBCPP___NUMERIC_PSTL_REDUCE_H |
| #define _LIBCPP___NUMERIC_PSTL_REDUCE_H |
| |
| #include <__algorithm/pstl_frontend_dispatch.h> |
| #include <__config> |
| #include <__functional/identity.h> |
| #include <__iterator/cpp17_iterator_concepts.h> |
| #include <__iterator/iterator_traits.h> |
| #include <__numeric/pstl_transform_reduce.h> |
| #include <__type_traits/is_execution_policy.h> |
| |
| #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) |
| # pragma GCC system_header |
| #endif |
| |
| _LIBCPP_PUSH_MACROS |
| #include <__undef_macros> |
| |
| #if !defined(_LIBCPP_HAS_NO_INCOMPLETE_PSTL) && _LIBCPP_STD_VER >= 17 |
| |
| _LIBCPP_BEGIN_NAMESPACE_STD |
| |
| template <class> |
| void __pstl_reduce(); |
| |
| template <class _ExecutionPolicy, |
| class _ForwardIterator, |
| class _Tp, |
| class _BinaryOperation = plus<>, |
| class _RawPolicy = __remove_cvref_t<_ExecutionPolicy>, |
| enable_if_t<is_execution_policy_v<_RawPolicy>, int> = 0> |
| [[nodiscard]] _LIBCPP_HIDE_FROM_ABI optional<_Tp> |
| __reduce(_ExecutionPolicy&& __policy, |
| _ForwardIterator&& __first, |
| _ForwardIterator&& __last, |
| _Tp&& __init, |
| _BinaryOperation&& __op = {}) noexcept { |
| return std::__pstl_frontend_dispatch( |
| _LIBCPP_PSTL_CUSTOMIZATION_POINT(__pstl_reduce, _RawPolicy), |
| [&__policy](_ForwardIterator __g_first, _ForwardIterator __g_last, _Tp __g_init, _BinaryOperation __g_op) { |
| return std::__transform_reduce( |
| __policy, std::move(__g_first), std::move(__g_last), std::move(__g_init), std::move(__g_op), __identity{}); |
| }, |
| std::move(__first), |
| std::move(__last), |
| std::move(__init), |
| std::move(__op)); |
| } |
| |
| template <class _ExecutionPolicy, |
| class _ForwardIterator, |
| class _Tp, |
| class _BinaryOperation = plus<>, |
| class _RawPolicy = __remove_cvref_t<_ExecutionPolicy>, |
| enable_if_t<is_execution_policy_v<_RawPolicy>, int> = 0> |
| _LIBCPP_HIDE_FROM_ABI _Tp |
| reduce(_ExecutionPolicy&& __policy, |
| _ForwardIterator __first, |
| _ForwardIterator __last, |
| _Tp __init, |
| _BinaryOperation __op = {}) { |
| _LIBCPP_REQUIRE_CPP17_FORWARD_ITERATOR(_ForwardIterator, "reduce requires ForwardIterators"); |
| auto __res = std::__reduce(__policy, std::move(__first), std::move(__last), std::move(__init), std::move(__op)); |
| if (!__res) |
| std::__throw_bad_alloc(); |
| return *std::move(__res); |
| } |
| |
| template <class _ExecutionPolicy, |
| class _ForwardIterator, |
| class _RawPolicy = __remove_cvref_t<_ExecutionPolicy>, |
| enable_if_t<is_execution_policy_v<_RawPolicy>, int> = 0> |
| [[nodiscard]] _LIBCPP_HIDE_FROM_ABI optional<__iter_value_type<_ForwardIterator>> |
| __reduce(_ExecutionPolicy&& __policy, _ForwardIterator&& __first, _ForwardIterator&& __last) noexcept { |
| return std::__pstl_frontend_dispatch( |
| _LIBCPP_PSTL_CUSTOMIZATION_POINT(__pstl_reduce, _RawPolicy), |
| [&__policy](_ForwardIterator __g_first, _ForwardIterator __g_last) { |
| return std::__reduce( |
| __policy, std::move(__g_first), std::move(__g_last), __iter_value_type<_ForwardIterator>()); |
| }, |
| std::move(__first), |
| std::move(__last)); |
| } |
| |
| template <class _ExecutionPolicy, |
| class _ForwardIterator, |
| class _RawPolicy = __remove_cvref_t<_ExecutionPolicy>, |
| enable_if_t<is_execution_policy_v<_RawPolicy>, int> = 0> |
| _LIBCPP_HIDE_FROM_ABI __iter_value_type<_ForwardIterator> |
| reduce(_ExecutionPolicy&& __policy, _ForwardIterator __first, _ForwardIterator __last) { |
| _LIBCPP_REQUIRE_CPP17_FORWARD_ITERATOR(_ForwardIterator, "reduce requires ForwardIterators"); |
| auto __res = std::__reduce(__policy, std::move(__first), std::move(__last)); |
| if (!__res) |
| std::__throw_bad_alloc(); |
| return *std::move(__res); |
| } |
| |
| _LIBCPP_END_NAMESPACE_STD |
| |
| #endif // !defined(_LIBCPP_HAS_NO_INCOMPLETE_PSTL) && _LIBCPP_STD_VER >= 17 |
| |
| _LIBCPP_POP_MACROS |
| |
| #endif // _LIBCPP___NUMERIC_PSTL_REDUCE_H |