BloombergLP::bdlcc::Deque::tryPopBack

Remove up to the specified maxNumItems from the back of this container. Optionally specify a buffer into which the items removed from the container are loaded. If buffer is non‐null, the removed items are appended to it as if by repeated application of buffer‐>push_back(popBack()) while the container is not empty and maxNumItems have not yet been removed. Note that the ordering of the items in *buffer after the call is the reverse of the ordering they had in the deque. Also note that *buffer is not cleared ‐‐ the popped items are appended after any pre‐existing contents.