|  | 
            Move-construct a posix::basic_stream_descriptor from
            another.
          
basic_stream_descriptor( basic_stream_descriptor && other);
This constructor moves a stream descriptor from one object to another.
                  The other posix::basic_stream_descriptor
                  object from which the move will occur.
                
            Following the move, the moved-from object is in the same state as if
            constructed using the basic_stream_descriptor(io_service&) constructor.