Michael Tsai on Twitter: "@rob_rix Right, I meant how NSFastEnumeration was designed to avoid message sends."

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Michael Tsai ‏@mjtsai 19 Aug 2015

Is there any optimization like NSFastEnumeration (batch fetching, detecting mutations) in Swift? SequenceType doesn’t seem to do that.
Rob Rix‎ ‏@rob_rix 19 Aug 2015

@mjtsai I think you can consider a Generator to be the equivalent of NSFastEnumerationState.
Michael Tsai ‏@mjtsai 19 Aug 2015

@rob_rix So no batching.
Rob Rix‎ ‏@rob_rix 19 Aug 2015

@mjtsai The generator can batch & detect mutations. Often it’ll live on the stack, so .next() is not much worse than incrementing the ptr.
Michael Tsai ‏@mjtsai 19 Aug 2015

@rob_rix that slow or that the batching isn’t that worth it.
Rob Rix‎ ‏@rob_rix 19 Aug 2015

@mjtsai As I understand it, it doesn’t necessarily have to send a message. It may not even need indirection through a vtable.

‏@mjtsai

@rob_rix Right, I meant how NSFastEnumeration was designed to avoid message sends.

10:14 AM - 19 Aug 2015

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