标准库头文件 <stop_token>
此头文件是线程支持库的一部分。
类 | |
(C++20) |
查询是否已经做出 std::jthread 取消请求的接口 (类) |
(C++20) |
表示请求停止一个或多个 std::jthread 的类 (类) |
(C++20) |
在 std::jthread 取消上注册回调的接口 (类模板) |
(C++20) |
用于 stop_source 构造函数的占位符类型 (类) |
常量 | |
(C++20) |
用于 stop_source 构造函数的 std::nostopstate_t 实例 (常量) |
概要
namespace std { // 类 stop_token class stop_token; // 类 stop_source class stop_source; // 无共享停止状态指示器 struct nostopstate_t { explicit nostopstate_t() = default; }; inline constexpr nostopstate_t nostopstate{}; // 类 stop_callback template<class Callback> class stop_callback; }
类 std::stop_token
namespace std { class stop_token { public: // 构造函数、复制与赋值 stop_token() noexcept; stop_token(const stop_token&) noexcept; stop_token(stop_token&&) noexcept; stop_token& operator=(const stop_token&) noexcept; stop_token& operator=(stop_token&&) noexcept; ~stop_token(); void swap(stop_token&) noexcept; // 停止处理 [[nodiscard]] bool stop_requested() const noexcept; [[nodiscard]] bool stop_possible() const noexcept; [[nodiscard]] friend bool operator==(const stop_token& lhs, const stop_token& rhs) noexcept; friend void swap(stop_token& lhs, stop_token& rhs) noexcept; }; }
类 std::stop_source
namespace std { // 无共享停止状态指示器 struct nostopstate_t { explicit nostopstate_t() = default; }; inline constexpr nostopstate_t nostopstate{}; class stop_source { public: // 构造函数、复制与赋值 stop_source(); explicit stop_source(nostopstate_t) noexcept; stop_source(const stop_source&) noexcept; stop_source(stop_source&&) noexcept; stop_source& operator=(const stop_source&) noexcept; stop_source& operator=(stop_source&&) noexcept; ~stop_source(); void swap(stop_source&) noexcept; // 停止处理 [[nodiscard]] stop_token get_token() const noexcept; [[nodiscard]] bool stop_possible() const noexcept; [[nodiscard]] bool stop_requested() const noexcept; bool request_stop() noexcept; [[nodiscard]] friend bool operator==(const stop_source& lhs, const stop_source& rhs) noexcept; friend void swap(stop_source& lhs, stop_source& rhs) noexcept; }; }
类模板 std::stop_callback
namespace std { template<class Callback> class stop_callback { public: using callback_type = Callback; // 构造函数与析构函数 template<class C> explicit stop_callback(const stop_token& st, C&& cb) noexcept(is_nothrow_constructible_v<Callback, C>); template<class C> explicit stop_callback(stop_token&& st, C&& cb) noexcept(is_nothrow_constructible_v<Callback, C>); ~stop_callback(); stop_callback(const stop_callback&) = delete; stop_callback(stop_callback&&) = delete; stop_callback& operator=(const stop_callback&) = delete; stop_callback& operator=(stop_callback&&) = delete; private: Callback callback; // 仅用于阐释 }; template<class Callback> stop_callback(stop_token, Callback) -> stop_callback<Callback>; }