Stephen Colebourne wrote:
I am unsure as to the use case for a ReferenceList/ReferenceSet. We already have ReferenceMap, which is very useful for building caches, but why would you need a List/Set? How would they operate?
Well, here's an example, of the top of my head. A weakly referencing list could be useful for implementing the observer pattern in a situation where you don't want the listeners to be strongly referenced by the event source. If the event source uses such a list to hold its listeners, then as long as the listeners remain strongly referenced, they will continue to receive events from the source. There will be no need to explicitly unregister the listeners, as once they become weakly referenced, then they will effectively be removed from the event listener list automatically.
Chris
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