stop_source();
explicit stop_source(nostopstate_t) noexcept;
stop_source(const stop_source& rhs) noexcept;
stop_source(stop_source&& rhs) noexcept;
~stop_source();
stop_source& operator=(const stop_source& rhs) noexcept;
stop_source& operator=(stop_source&& rhs) noexcept;
void swap(stop_source& rhs) noexcept;