Output buffer for the algorithm to write to.
This is NOT the data ready after process, but where the
algorithm must write next.
after a call to process, the slice is reduced by its beginning,
and the data written is therefore the one before the slice.
Output buffer for the algorithm to write to. This is NOT the data ready after process, but where the algorithm must write next. after a call to process, the slice is reduced by its beginning, and the data written is therefore the one before the slice.