标准库头文件 <thread>

namespace std {
    class thread;
 
    void swap(thread& x, thread& y) noexcept;
 
    bool operator==(thread::id x, thread::id y) noexcept;
    bool operator!=(thread::id x, thread::id y) noexcept;
 
    bool operator<(thread::id x, thread::id y) noexcept;
    bool operator<=(thread::id x, thread::id y) noexcept;
    bool operator>(thread::id x, thread::id y) noexcept;
    bool operator>=(thread::id x, thread::id y) noexcept;
 
    template<class CharT, class Traits>
    basic_ostream<CharT, Traits>& operator<<(basic_ostream<CharT, Traits>& out,
                                            thread::id id);
 
    template <class T> struct hash;
    template <> struct hash<thread::id>;
 
    namespace this_thread {
 
        thread::id get_id() noexcept;
        void yield() noexcept;
        template <class Clock, class Duration>
            void sleep_until(const chrono::time_point<Clock, Duration>& abs_time);
        template <class Rep, class Period>
            void sleep_for(const chrono::duration<Rep, Period>& rel_time);
 
    }
}

class thread {
 public:
    // 类型：
    class id;
    typedef /* 由实现定义 */ native_handle_type;
 
    // 构造/复制/销毁：
    thread() noexcept;
    template <class F, class ...Args> explicit thread(F&& f, Args&&... args);
    ~thread();
    thread(const thread&) = delete;
    thread(thread&&) noexcept;
    thread& operator=(const thread&) = delete;
    thread& operator=(thread&&) noexcept;
 
    // 成员：
    void swap(thread&) noexcept;
    bool joinable() const noexcept;
    void join();
    void detach();
    id get_id() const noexcept;
    native_handle_type native_handle();
 
    // 静态成员：
    static unsigned hardware_concurrency() noexcept;
};

namespace std {
    class jthread {
    public:
        // 类型
        using id = thread::id;
        using native_handle_type = thread::native_handle_type;
 
        // 构造函数、移动与赋值
        jthread() noexcept;
        template<class F, class... Args> explicit jthread(F&& f, Args&&... args);
        ~jthread();
        jthread(const jthread&) = delete;
        jthread(jthread&&) noexcept;
        jthread& operator=(const jthread&) = delete;
        jthread& operator=(jthread&&) noexcept;
 
        // 成员
        void swap(jthread&) noexcept;
        [[nodiscard]] bool joinable() const noexcept;
        void join();
        void detach();
        [[nodiscard]] id get_id() const noexcept;
        [[nodiscard]] native_handle_type native_handle();
 
        // 停止记号处理
        [[nodiscard]] stop_source get_stop_source() noexcept;
        [[nodiscard]] stop_token get_stop_token() const noexcept;
        bool request_stop() noexcept;
 
        // 特化的算法
        friend void swap(jthread& lhs, jthread& rhs) noexcept;
 
        // 静态成员
        [[nodiscard]] static unsigned int hardware_concurrency() noexcept;
 
    private:
        stop_source ssource;        // 仅用于阐释
    };
}

class thread::id {
 public:
    id() noexcept;
};