d423d80e56
This patch removes the two-level backend dispatching mechanism we had in the PSTL. Instead of selecting both a PSTL backend and a PSTL CPU backend, we now only select a top-level PSTL backend. This greatly simplifies the PSTL configuration layer. While this patch technically removes some flexibility from the PSTL configuration mechanism because CPU backends are not considered separately, it opens the door to a much more powerful configuration mechanism based on chained backends in a follow-up patch. This is a step towards overhauling the PSTL dispatching mechanism.
114 lines
4.3 KiB
C++
114 lines
4.3 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_GENERATE_H
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#define _LIBCPP___ALGORITHM_PSTL_GENERATE_H
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#include <__algorithm/pstl_for_each.h>
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#include <__algorithm/pstl_frontend_dispatch.h>
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#include <__config>
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#include <__iterator/cpp17_iterator_concepts.h>
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#include <__iterator/iterator_traits.h>
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#include <__pstl/configuration.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 <optional>
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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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_LIBCPP_PUSH_MACROS
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#include <__undef_macros>
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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>
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void __pstl_generate();
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template <class _ExecutionPolicy,
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class _ForwardIterator,
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class _Generator,
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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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[[nodiscard]] _LIBCPP_HIDE_FROM_ABI optional<__empty>
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__generate(_ExecutionPolicy&& __policy, _ForwardIterator&& __first, _ForwardIterator&& __last, _Generator&& __gen) {
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return std::__pstl_frontend_dispatch(
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_LIBCPP_PSTL_CUSTOMIZATION_POINT(__pstl_generate, _RawPolicy),
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[&__policy](_ForwardIterator __g_first, _ForwardIterator __g_last, _Generator __g_gen) {
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return std::__for_each(
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__policy, std::move(__g_first), std::move(__g_last), [&](__iter_reference<_ForwardIterator> __element) {
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__element = __g_gen();
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});
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},
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std::move(__first),
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std::move(__last),
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std::move(__gen));
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}
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template <class _ExecutionPolicy,
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class _ForwardIterator,
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class _Generator,
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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 void
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generate(_ExecutionPolicy&& __policy, _ForwardIterator __first, _ForwardIterator __last, _Generator __gen) {
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_LIBCPP_REQUIRE_CPP17_FORWARD_ITERATOR(_ForwardIterator, "generate requires ForwardIterators");
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if (!std::__generate(__policy, std::move(__first), std::move(__last), std::move(__gen)))
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std::__throw_bad_alloc();
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}
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template <class>
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void __pstl_generate_n();
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template <class _ExecutionPolicy,
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class _ForwardIterator,
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class _Size,
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class _Generator,
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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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[[nodiscard]] _LIBCPP_HIDE_FROM_ABI optional<__empty>
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__generate_n(_ExecutionPolicy&& __policy, _ForwardIterator&& __first, _Size&& __n, _Generator&& __gen) {
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return std::__pstl_frontend_dispatch(
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_LIBCPP_PSTL_CUSTOMIZATION_POINT(__pstl_generate_n, _RawPolicy),
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[&__policy](_ForwardIterator __g_first, _Size __g_n, _Generator __g_gen) {
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return std::__for_each_n(
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__policy, std::move(__g_first), std::move(__g_n), [&](__iter_reference<_ForwardIterator> __element) {
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__element = __g_gen();
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});
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},
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std::move(__first),
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__n,
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std::move(__gen));
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}
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template <class _ExecutionPolicy,
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class _ForwardIterator,
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class _Size,
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class _Generator,
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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 void
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generate_n(_ExecutionPolicy&& __policy, _ForwardIterator __first, _Size __n, _Generator __gen) {
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_LIBCPP_REQUIRE_CPP17_FORWARD_ITERATOR(_ForwardIterator, "generate_n requires a ForwardIterator");
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if (!std::__generate_n(__policy, std::move(__first), std::move(__n), std::move(__gen)))
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std::__throw_bad_alloc();
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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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_LIBCPP_POP_MACROS
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#endif // _LIBCPP___ALGORITHM_PSTL_GENERATE_H
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