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            Move-assign a basic_socket from a socket of
            another protocol type.
          
template< typename Protocol1, typename SocketService1> enable_if< is_convertible< Protocol1, Protocol >::value, basic_socket >::type & operator=( basic_socket< Protocol1, SocketService1 > && other);
This assignment operator moves a socket from one object to another.
                  The other basic_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_socket(io_service&) constructor.