Function dispatch

3rd/asio-1.24.0/include/asio/detail/handler_work.hpp:278–282

  template <typename Function, typename Handler>
  void dispatch(Function& function, Handler& handler)
  {
    executor_.dispatch(ASIO_MOVE_CAST(Function)(function),
        asio::get_associated_allocator(handler));
  }

private:
  Executor executor_;