Implementing CollectionType in Swift 2.x
I ran into trouble with custom collections the other day and wondered how to reliably find out what the bare minimum for a custom CollectionType is. The compiler will only help a bit: It’s conforming to neither CollectionType nor SequenceType. Now I know SequenceType requires the generate() method – but don’t let this fool you. CollectionType will provide that for you if you meet its requirements.