mirror of
https://github.com/jart/cosmopolitan.git
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146 lines
5.1 KiB
C++
146 lines
5.1 KiB
C++
// -*- C++ -*-
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//===----------------------------------------------------------------------===//
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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_EXECUTION
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#define _LIBCPP_EXECUTION
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/*
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namespace std::execution {
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struct sequenced_policy;
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struct parallel_policy;
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struct parallel_unsequenced_policy;
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struct unsequenced_policy; // since C++20
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inline constexpr sequenced_policy seq = implementation-defined;
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inline constexpr parallel_policy par = implementation-defined;
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inline constexpr parallel_unsequenced_policy par_unseq = implementation-defined;
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inline constexpr unsequenced_policy unseq = implementation-defined; // since C++20
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}
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namespace std {
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template <class T>
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struct is_execution_policy;
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template <class T>
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inline constexpr bool is_execution_policy_v;
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}
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*/
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#include <__assert> // all public C++ headers provide the assertion handler
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#include <__config>
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#include <__type_traits/is_execution_policy.h>
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#include <__type_traits/is_same.h>
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#include <__type_traits/remove_cvref.h>
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#include <version>
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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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namespace execution {
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struct sequenced_policy {
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_LIBCPP_HIDE_FROM_ABI constexpr explicit sequenced_policy(__disable_user_instantiations_tag) {}
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sequenced_policy(const sequenced_policy&) = delete;
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sequenced_policy& operator=(const sequenced_policy&) = delete;
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};
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inline constexpr sequenced_policy seq{__disable_user_instantiations_tag{}};
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struct parallel_policy {
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_LIBCPP_HIDE_FROM_ABI constexpr explicit parallel_policy(__disable_user_instantiations_tag) {}
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parallel_policy(const parallel_policy&) = delete;
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parallel_policy& operator=(const parallel_policy&) = delete;
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};
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inline constexpr parallel_policy par{__disable_user_instantiations_tag{}};
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struct parallel_unsequenced_policy {
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_LIBCPP_HIDE_FROM_ABI constexpr explicit parallel_unsequenced_policy(__disable_user_instantiations_tag) {}
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parallel_unsequenced_policy(const parallel_unsequenced_policy&) = delete;
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parallel_unsequenced_policy& operator=(const parallel_unsequenced_policy&) = delete;
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};
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inline constexpr parallel_unsequenced_policy par_unseq{__disable_user_instantiations_tag{}};
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struct __unsequenced_policy {
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_LIBCPP_HIDE_FROM_ABI constexpr explicit __unsequenced_policy(__disable_user_instantiations_tag) {}
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__unsequenced_policy(const __unsequenced_policy&) = delete;
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__unsequenced_policy& operator=(const __unsequenced_policy&) = delete;
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};
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constexpr __unsequenced_policy __unseq{__disable_user_instantiations_tag{}};
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# if _LIBCPP_STD_VER >= 20
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struct unsequenced_policy {
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_LIBCPP_HIDE_FROM_ABI constexpr explicit unsequenced_policy(__disable_user_instantiations_tag) {}
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unsequenced_policy(const unsequenced_policy&) = delete;
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unsequenced_policy& operator=(const unsequenced_policy&) = delete;
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};
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inline constexpr unsequenced_policy unseq{__disable_user_instantiations_tag{}};
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# endif // _LIBCPP_STD_VER >= 20
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} // namespace execution
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template <>
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inline constexpr bool is_execution_policy_v<execution::sequenced_policy> = true;
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template <>
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inline constexpr bool is_execution_policy_v<execution::parallel_policy> = true;
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template <>
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inline constexpr bool is_execution_policy_v<execution::parallel_unsequenced_policy> = true;
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template <>
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inline constexpr bool is_execution_policy_v<execution::__unsequenced_policy> = true;
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template <>
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inline constexpr bool __is_parallel_execution_policy_impl<execution::parallel_policy> = true;
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template <>
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inline constexpr bool __is_parallel_execution_policy_impl<execution::parallel_unsequenced_policy> = true;
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template <>
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inline constexpr bool __is_unsequenced_execution_policy_impl<execution::__unsequenced_policy> = true;
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template <>
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inline constexpr bool __is_unsequenced_execution_policy_impl<execution::parallel_unsequenced_policy> = true;
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# if _LIBCPP_STD_VER >= 20
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template <>
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inline constexpr bool is_execution_policy_v<execution::unsequenced_policy> = true;
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template <>
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inline constexpr bool __is_unsequenced_execution_policy_impl<execution::unsequenced_policy> = true;
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# endif
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template <class _Tp>
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struct is_execution_policy : bool_constant<is_execution_policy_v<_Tp>> {};
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template <class _ExecutionPolicy>
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_LIBCPP_HIDE_FROM_ABI auto __remove_parallel_policy(const _ExecutionPolicy&) {
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if constexpr (is_same_v<_ExecutionPolicy, execution::parallel_policy>) {
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return execution::sequenced_policy(execution::__disable_user_instantiations_tag{});
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} else if constexpr (is_same_v<_ExecutionPolicy, execution::parallel_unsequenced_policy>) {
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return execution::__unsequenced_policy{execution::__disable_user_instantiations_tag{}};
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}
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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_EXECUTION
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