<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def grab_following(self, timeout: float=None) -> typing.List[DataAndMetadata.DataAndMetadata]: """Grab the next data to start from the buffer, blocking until one is available."""

        self.grab_next(timeout)
        return self.grab_next(timeout)