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-exception 7// 8//===----------------------------------------------------------------------===// 9 10#ifndef _LIBCPP_EXECUTION 11#define _LIBCPP_EXECUTION 12 13/* 14namespace std::execution { 15 struct sequenced_policy; 16 struct parallel_policy; 17 struct parallel_unsequenced_policy; 18 struct unsequenced_policy; // since C++20 19 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++20 24} 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/execution> 37#else 38# 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_header 46# endif 47 48# if _LIBCPP_HAS_EXPERIMENTAL_PSTL && _LIBCPP_STD_VER >= 17 49 50_LIBCPP_BEGIN_NAMESPACE_STD 51 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 >= 20 86 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 >= 20 96 97} // namespace execution 98 99_LIBCPP_DIAGNOSTIC_PUSH 100# if __has_warning("-Winvalid-specialization") 101_LIBCPP_CLANG_DIAGNOSTIC_IGNORED("-Winvalid-specialization") 102# endif 103template <> 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_POP 115 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 >= 20 129_LIBCPP_DIAGNOSTIC_PUSH 130# if __has_warning("-Winvalid-specialization") 131_LIBCPP_CLANG_DIAGNOSTIC_IGNORED("-Winvalid-specialization") 132# endif 133template <> 134inline constexpr bool is_execution_policy_v<execution::unsequenced_policy> = true; 135_LIBCPP_DIAGNOSTIC_POP 136 137template <> 138inline constexpr bool __is_unsequenced_execution_policy_impl<execution::unsequenced_policy> = true; 139 140# endif 141 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_STD 155 156# endif // _LIBCPP_HAS_EXPERIMENTAL_PSTL && _LIBCPP_STD_VER >= 17 157 158# if !defined(_LIBCPP_REMOVE_TRANSITIVE_INCLUDES) && _LIBCPP_STD_VER <= 20 159# include <cstddef> 160# endif 161#endif // __cplusplus < 201103L && defined(_LIBCPP_USE_FROZEN_CXX03_HEADERS) 162 163#endif // _LIBCPP_EXECUTION 164