Remove the first item from the list and load a reference to it into the specified item. This reference must be released (using releaseReferenceRaw) when it is no longer needed. Return 0 on success, and a non-zero value if the list is empty.
item
releaseReferenceRaw
Declared in <bdlcc_skiplist.h>
<bdlcc_skiplist.h>
int popFrontRaw(Pair** item);