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.
109 lines
4.4 KiB
C++
109 lines
4.4 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_FOR_EACH_H
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#define _LIBCPP___ALGORITHM_PSTL_FOR_EACH_H
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#include <__algorithm/for_each.h>
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#include <__algorithm/for_each_n.h>
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#include <__algorithm/pstl_frontend_dispatch.h>
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#include <__config>
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#include <__iterator/concepts.h>
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#include <__iterator/cpp17_iterator_concepts.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 <__type_traits/void_t.h>
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#include <__utility/empty.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 _ExecutionPolicy,
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class _ForwardIterator,
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class _Function,
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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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__for_each(_ExecutionPolicy&&, _ForwardIterator&& __first, _ForwardIterator&& __last, _Function&& __func) noexcept {
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using _Backend = typename __select_backend<_RawPolicy>::type;
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return std::__pstl_for_each<_RawPolicy>(_Backend{}, std::move(__first), std::move(__last), std::move(__func));
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}
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template <class _ExecutionPolicy,
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class _ForwardIterator,
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class _Function,
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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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for_each(_ExecutionPolicy&& __policy, _ForwardIterator __first, _ForwardIterator __last, _Function __func) {
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_LIBCPP_REQUIRE_CPP17_FORWARD_ITERATOR(_ForwardIterator, "for_each requires ForwardIterators");
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if (!std::__for_each(__policy, std::move(__first), std::move(__last), std::move(__func)))
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std::__throw_bad_alloc();
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}
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template <class>
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void __pstl_for_each_n(); // declaration needed for the frontend dispatch below
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template <class _ExecutionPolicy,
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class _ForwardIterator,
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class _Size,
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class _Function,
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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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__for_each_n(_ExecutionPolicy&& __policy, _ForwardIterator&& __first, _Size&& __size, _Function&& __func) noexcept {
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return std::__pstl_frontend_dispatch(
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_LIBCPP_PSTL_CUSTOMIZATION_POINT(__pstl_for_each_n, _RawPolicy),
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[&](_ForwardIterator __g_first, _Size __g_size, _Function __g_func) -> optional<__empty> {
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if constexpr (__has_random_access_iterator_category_or_concept<_ForwardIterator>::value) {
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std::for_each(__policy, std::move(__g_first), __g_first + __g_size, std::move(__g_func));
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return __empty{};
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} else {
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std::for_each_n(std::move(__g_first), __g_size, std::move(__g_func));
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return __empty{};
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}
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},
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std::move(__first),
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std::move(__size),
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std::move(__func));
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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 _Function,
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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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for_each_n(_ExecutionPolicy&& __policy, _ForwardIterator __first, _Size __size, _Function __func) {
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_LIBCPP_REQUIRE_CPP17_FORWARD_ITERATOR(_ForwardIterator, "for_each_n requires a ForwardIterator");
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auto __res = std::__for_each_n(__policy, std::move(__first), std::move(__size), std::move(__func));
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if (!__res)
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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_FOR_EACH_H
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