e78f53d1e8
This reverts commit 68c04b0ae6.
This disables the IWYU mapping that caused the failure, since
the headers aren't reachable for now.
This is the first part of the "Freezing C++03 headers" proposal
explained in
https://discourse.llvm.org/t/rfc-freezing-c-03-headers-in-libc/77319/58.
This patch mechanically copies the headers as of the LLVM 19.1 release
into a subdirectory of libc++ so that we can start using these headers
when building in C++03 mode. We are going to be backporting important
changes to that copy of the headers until the LLVM 21 release. After the
LLVM 21 release, only critical bugfixes will be fixed in the C++03 copy
of the headers.
This patch only performs a copy of the headers -- these headers are
still unused by the rest of the codebase.
150 lines
5.1 KiB
C++
150 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 <__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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#if !defined(_LIBCPP_REMOVE_TRANSITIVE_INCLUDES) && _LIBCPP_STD_VER <= 20
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# include <cstddef>
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#endif
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#endif // _LIBCPP_EXECUTION
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