[quote="mikedee"] I suspect a major advantage of the WRAP / UNWRAP macros is speed.[/quote]
linked lists can be very fast too, just something like:
WRAP: s->functionList = s->functionList->next; s->function = s->functionList->function;
UNWRAP: s->functionList = s->functionList->prev; s->function = s->functionList->function;

probably as fast as the normal WRAP / UNWRAP.