|  | 
            Construct a posix::basic_stream_descriptor on an
            existing native descriptor.
          
basic_stream_descriptor( asio::io_service & io_service, const native_handle_type & native_descriptor);
This constructor creates a stream descriptor object to hold an existing native descriptor.
                  The io_service
                  object that the stream descriptor will use to dispatch handlers
                  for any asynchronous operations performed on the descriptor.
                
The new underlying descriptor implementation.
Thrown on failure.