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            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(io_service&) constructor.