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#include <compare>
 
namespace std {
 // class thread
 class thread;
 
 void swap(thread& x, thread& y) noexcept;
 
 // class jthread
 class jthread;
 
 // namespace this_thread
 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);
 }
}

namespace std {
 class thread
 {
 public:
 // class thread::id
 class id;
 using native_handle_type = /* implementation-defined */;
 
 // construct/copy/destroy
 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;
 
 // members
 void swap(thread&) noexcept;
 bool joinable() const noexcept;
 void join();
 void detach();
 id get_id() const noexcept;
 native_handle_type native_handle();
 
 // static members
 static unsigned int hardware_concurrency() noexcept;
 };
}

namespace std {
 class jthread
 {
 public:
 // types
 using id = thread::id;
 using native_handle_type = thread::native_handle_type;
 
 // constructors, move, and assignment
 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;
 
 // members
 void swap(jthread&) noexcept;
 bool joinable() const noexcept;
 void join();
 void detach();
 id get_id() const noexcept;
 native_handle_type native_handle();
 
 // stop token handling
 stop_source get_stop_source() noexcept;
 stop_token get_stop_token() const noexcept;
 bool request_stop() noexcept;
 
 // specialized algorithms
 friend void swap(jthread& lhs, jthread& rhs) noexcept;
 
 // static members
 static unsigned int hardware_concurrency() noexcept;
 
 private:
 stop_source ssource; // exposition only
 };
}

namespace std {
 class thread::id
 {
 public:
 id() noexcept;
 };
 
 bool operator==(thread::id x, thread::id y) noexcept;
 strong_ordering 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 CharT>
 struct formatter<thread::id, CharT>;
 
 // hash support
 template<class T>
 struct hash;
 template<>
 struct hash<thread::id>;
}