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0e2de665f3
P2408 requires this for C++23, but implementing it in C++20 is safe because the only code impacted would be code that violated a precondition of the parallel algorithm. It was P2408 intent to enable implementations to backport this to C++20. Closes #63447 . Reviewed By: philnik, #libc Differential Revision: https://reviews.llvm.org/D154305
77 lines
3.0 KiB
C++
77 lines
3.0 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#ifndef _LIBCPP___ALGORITHM_PSTL_TRANSFORM_H
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#define _LIBCPP___ALGORITHM_PSTL_TRANSFORM_H
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#include <__algorithm/pstl_backend.h>
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#include <__config>
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#include <__iterator/cpp17_iterator_concepts.h>
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#include <__type_traits/enable_if.h>
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#include <__type_traits/is_execution_policy.h>
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#include <__type_traits/remove_cvref.h>
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#include <__utility/move.h>
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#include <__utility/terminate_on_exception.h>
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#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
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# pragma GCC system_header
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#endif
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#if !defined(_LIBCPP_HAS_NO_INCOMPLETE_PSTL) && _LIBCPP_STD_VER >= 17
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_LIBCPP_BEGIN_NAMESPACE_STD
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template <class _ExecutionPolicy,
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class _ForwardIterator,
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class _ForwardOutIterator,
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class _UnaryOperation,
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class _RawPolicy = __remove_cvref_t<_ExecutionPolicy>,
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enable_if_t<is_execution_policy_v<_RawPolicy>, int> = 0>
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_LIBCPP_HIDE_FROM_ABI _ForwardOutIterator transform(
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_ExecutionPolicy&&,
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_ForwardIterator __first,
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_ForwardIterator __last,
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_ForwardOutIterator __result,
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_UnaryOperation __op) {
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_LIBCPP_REQUIRE_CPP17_FORWARD_ITERATOR(_ForwardIterator);
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_LIBCPP_REQUIRE_CPP17_FORWARD_ITERATOR(_ForwardOutIterator);
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_LIBCPP_REQUIRE_CPP17_OUTPUT_ITERATOR(_ForwardOutIterator, decltype(__op(*__first)));
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using _Backend = typename __select_backend<_RawPolicy>::type;
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return std::__pstl_transform<_RawPolicy>(
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_Backend{}, std::move(__first), std::move(__last), std::move(__result), std::move(__op));
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}
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template <class _ExecutionPolicy,
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class _ForwardIterator1,
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class _ForwardIterator2,
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class _ForwardOutIterator,
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class _BinaryOperation,
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class _RawPolicy = __remove_cvref_t<_ExecutionPolicy>,
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enable_if_t<is_execution_policy_v<_RawPolicy>, int> = 0>
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_LIBCPP_HIDE_FROM_ABI _ForwardOutIterator transform(
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_ExecutionPolicy&&,
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_ForwardIterator1 __first1,
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_ForwardIterator1 __last1,
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_ForwardIterator2 __first2,
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_ForwardOutIterator __result,
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_BinaryOperation __op) {
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_LIBCPP_REQUIRE_CPP17_FORWARD_ITERATOR(_ForwardIterator1);
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_LIBCPP_REQUIRE_CPP17_FORWARD_ITERATOR(_ForwardIterator2);
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_LIBCPP_REQUIRE_CPP17_FORWARD_ITERATOR(_ForwardOutIterator);
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_LIBCPP_REQUIRE_CPP17_OUTPUT_ITERATOR(_ForwardOutIterator, decltype(__op(*__first1, *__first2)));
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using _Backend = typename __select_backend<_RawPolicy>::type;
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return std::__pstl_transform<_RawPolicy>(
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_Backend{}, std::move(__first1), std::move(__last1), std::move(__first2), std::move(__result), std::move(__op));
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}
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_LIBCPP_END_NAMESPACE_STD
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#endif // !defined(_LIBCPP_HAS_NO_INCOMPLETE_PSTL) && _LIBCPP_STD_VER >= 17
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#endif // _LIBCPP___ALGORITHM_PSTL_TRANSFORM_H
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