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1// -*- C++ -*-2//===----------------------------------------------------------------------===//3//4// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.5// See https://llvm.org/LICENSE.txt for license information.6// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception7//8//===----------------------------------------------------------------------===//9 10#ifndef _LIBCPP_EXECUTION11#define _LIBCPP_EXECUTION12 13/*14namespace std::execution {15 struct sequenced_policy;16 struct parallel_policy;17 struct parallel_unsequenced_policy;18 struct unsequenced_policy; // since C++2019 20 inline constexpr sequenced_policy seq = implementation-defined;21 inline constexpr parallel_policy par = implementation-defined;22 inline constexpr parallel_unsequenced_policy par_unseq = implementation-defined;23 inline constexpr unsequenced_policy unseq = implementation-defined; // since C++2024}25 26namespace std {27 template <class T>28 struct is_execution_policy;29 30 template <class T>31 inline constexpr bool is_execution_policy_v;32}33*/34 35#if __cplusplus < 201103L && defined(_LIBCPP_USE_FROZEN_CXX03_HEADERS)36# include <__cxx03/__config>37#else38# include <__config>39# include <__type_traits/is_execution_policy.h>40# include <__type_traits/is_same.h>41# include <__type_traits/remove_cvref.h>42# include <version>43 44# if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)45# pragma GCC system_header46# endif47 48# if _LIBCPP_HAS_EXPERIMENTAL_PSTL && _LIBCPP_STD_VER >= 1749 50_LIBCPP_BEGIN_NAMESPACE_STD51 52namespace execution {53struct sequenced_policy {54 _LIBCPP_HIDE_FROM_ABI constexpr explicit sequenced_policy(__disable_user_instantiations_tag) {}55 sequenced_policy(const sequenced_policy&) = delete;56 sequenced_policy& operator=(const sequenced_policy&) = delete;57};58 59inline constexpr sequenced_policy seq{__disable_user_instantiations_tag{}};60 61struct parallel_policy {62 _LIBCPP_HIDE_FROM_ABI constexpr explicit parallel_policy(__disable_user_instantiations_tag) {}63 parallel_policy(const parallel_policy&) = delete;64 parallel_policy& operator=(const parallel_policy&) = delete;65};66 67inline constexpr parallel_policy par{__disable_user_instantiations_tag{}};68 69struct parallel_unsequenced_policy {70 _LIBCPP_HIDE_FROM_ABI constexpr explicit parallel_unsequenced_policy(__disable_user_instantiations_tag) {}71 parallel_unsequenced_policy(const parallel_unsequenced_policy&) = delete;72 parallel_unsequenced_policy& operator=(const parallel_unsequenced_policy&) = delete;73};74 75inline constexpr parallel_unsequenced_policy par_unseq{__disable_user_instantiations_tag{}};76 77struct __unsequenced_policy {78 _LIBCPP_HIDE_FROM_ABI constexpr explicit __unsequenced_policy(__disable_user_instantiations_tag) {}79 __unsequenced_policy(const __unsequenced_policy&) = delete;80 __unsequenced_policy& operator=(const __unsequenced_policy&) = delete;81};82 83constexpr __unsequenced_policy __unseq{__disable_user_instantiations_tag{}};84 85# if _LIBCPP_STD_VER >= 2086 87struct unsequenced_policy {88 _LIBCPP_HIDE_FROM_ABI constexpr explicit unsequenced_policy(__disable_user_instantiations_tag) {}89 unsequenced_policy(const unsequenced_policy&) = delete;90 unsequenced_policy& operator=(const unsequenced_policy&) = delete;91};92 93inline constexpr unsequenced_policy unseq{__disable_user_instantiations_tag{}};94 95# endif // _LIBCPP_STD_VER >= 2096 97} // namespace execution98 99_LIBCPP_DIAGNOSTIC_PUSH100# if __has_warning("-Winvalid-specialization")101_LIBCPP_CLANG_DIAGNOSTIC_IGNORED("-Winvalid-specialization")102# endif103template <>104inline constexpr bool is_execution_policy_v<execution::sequenced_policy> = true;105 106template <>107inline constexpr bool is_execution_policy_v<execution::parallel_policy> = true;108 109template <>110inline constexpr bool is_execution_policy_v<execution::parallel_unsequenced_policy> = true;111 112template <>113inline constexpr bool is_execution_policy_v<execution::__unsequenced_policy> = true;114_LIBCPP_DIAGNOSTIC_POP115 116template <>117inline constexpr bool __is_parallel_execution_policy_impl<execution::parallel_policy> = true;118 119template <>120inline constexpr bool __is_parallel_execution_policy_impl<execution::parallel_unsequenced_policy> = true;121 122template <>123inline constexpr bool __is_unsequenced_execution_policy_impl<execution::__unsequenced_policy> = true;124 125template <>126inline constexpr bool __is_unsequenced_execution_policy_impl<execution::parallel_unsequenced_policy> = true;127 128# if _LIBCPP_STD_VER >= 20129_LIBCPP_DIAGNOSTIC_PUSH130# if __has_warning("-Winvalid-specialization")131_LIBCPP_CLANG_DIAGNOSTIC_IGNORED("-Winvalid-specialization")132# endif133template <>134inline constexpr bool is_execution_policy_v<execution::unsequenced_policy> = true;135_LIBCPP_DIAGNOSTIC_POP136 137template <>138inline constexpr bool __is_unsequenced_execution_policy_impl<execution::unsequenced_policy> = true;139 140# endif141 142template <class _Tp>143struct _LIBCPP_NO_SPECIALIZATIONS is_execution_policy : bool_constant<is_execution_policy_v<_Tp>> {};144 145template <class _ExecutionPolicy>146_LIBCPP_HIDE_FROM_ABI auto __remove_parallel_policy(const _ExecutionPolicy&) {147 if constexpr (is_same_v<_ExecutionPolicy, execution::parallel_policy>) {148 return execution::sequenced_policy(execution::__disable_user_instantiations_tag{});149 } else if constexpr (is_same_v<_ExecutionPolicy, execution::parallel_unsequenced_policy>) {150 return execution::__unsequenced_policy{execution::__disable_user_instantiations_tag{}};151 }152}153 154_LIBCPP_END_NAMESPACE_STD155 156# endif // _LIBCPP_HAS_EXPERIMENTAL_PSTL && _LIBCPP_STD_VER >= 17157 158# if !defined(_LIBCPP_REMOVE_TRANSITIVE_INCLUDES) && _LIBCPP_STD_VER <= 20159# include <cstddef>160# endif161#endif // __cplusplus < 201103L && defined(_LIBCPP_USE_FROZEN_CXX03_HEADERS)162 163#endif // _LIBCPP_EXECUTION164