Returns a result if availble within "timeout" else raises a 
        ``TimeoutError`` exception. See documentation for ``NuMap.next``.

def next(self):
        """
        Returns a result if availble within "timeout" else raises a 
        ``TimeoutError`` exception. See documentation for ``NuMap.next``.
        """
        return self.iterator.next(task=self.task, timeout=self.timeout,
                                                    block=self.block)