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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___STOP_TOKEN_STOP_TOKEN_H11#define _LIBCPP___STOP_TOKEN_STOP_TOKEN_H12 13#include <__config>14#include <__stop_token/intrusive_shared_ptr.h>15#include <__stop_token/stop_state.h>16 17#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)18# pragma GCC system_header19#endif20 21_LIBCPP_BEGIN_NAMESPACE_STD22 23#if _LIBCPP_STD_VER >= 20 && _LIBCPP_HAS_THREADS24 25class stop_token {26public:27 _LIBCPP_HIDE_FROM_ABI stop_token() noexcept = default;28 29 _LIBCPP_HIDE_FROM_ABI stop_token(const stop_token&) noexcept = default;30 _LIBCPP_HIDE_FROM_ABI stop_token(stop_token&&) noexcept = default;31 _LIBCPP_HIDE_FROM_ABI stop_token& operator=(const stop_token&) noexcept = default;32 _LIBCPP_HIDE_FROM_ABI stop_token& operator=(stop_token&&) noexcept = default;33 _LIBCPP_HIDE_FROM_ABI ~stop_token() = default;34 35 _LIBCPP_HIDE_FROM_ABI void swap(stop_token& __other) noexcept { __state_.swap(__other.__state_); }36 37 [[nodiscard]] _LIBCPP_HIDE_FROM_ABI bool stop_requested() const noexcept {38 return __state_ != nullptr && __state_->__stop_requested();39 }40 41 [[nodiscard]] _LIBCPP_HIDE_FROM_ABI bool stop_possible() const noexcept {42 return __state_ != nullptr && __state_->__stop_possible_for_stop_token();43 }44 45 [[nodiscard]] _LIBCPP_HIDE_FROM_ABI friend bool operator==(const stop_token&, const stop_token&) noexcept = default;46 47 _LIBCPP_HIDE_FROM_ABI friend void swap(stop_token& __lhs, stop_token& __rhs) noexcept { __lhs.swap(__rhs); }48 49private:50 __intrusive_shared_ptr<__stop_state> __state_;51 52 friend class stop_source;53 template <class _Tp>54 friend class stop_callback;55 56 _LIBCPP_HIDE_FROM_ABI explicit stop_token(const __intrusive_shared_ptr<__stop_state>& __state) : __state_(__state) {}57};58 59#endif // _LIBCPP_STD_VER >= 20 && _LIBCPP_HAS_THREADS60 61_LIBCPP_END_NAMESPACE_STD62 63#endif // _LIBCPP___STOP_TOKEN_STOP_TOKEN_H64