|  | 
            Move-assign a basic_stream_socket
            from another.
          
basic_stream_socket & operator=(
    basic_stream_socket && other);
This assignment operator moves a stream socket from one object to another.
                  The other basic_stream_socket
                  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_socket(const executor_type&)
            constructor.