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//===----------------------------------------------------------------------===//
//
// 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/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
#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 = {}) {
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) {
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
#endif // _LIBCPP___NUMERIC_PSTL_REDUCE_H
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