When is NSCopying needed?

Question

I know it\'s needed if your object will be used as a key in an NSDictionary. Are there any other times like this that NSCopying is required?

If I think I don\'t need my

Answer 1

NSCopying has quite broad usage. Anytime an object owns something it shouldn't share with other objects, you'll need a copy. Mutable objects often need to be copied, though NSMutableCopying might be needed instead of NSCopying.