Dynamically add world actors to an array as they are spawned?

I’ve yet to figure out how to bind to these but for now this is something I found in World.h:

DECLARE_MULTICAST_DELEGATE_OneParam(FOnActorSpawned, AActor*);
DECLARE_MULTICAST_DELEGATE_OneParam(FOnActorDestroyed, AActor*);

Again, haven’t been able to make it work yet. Still looking for publicly-available dispatchers to bind to.