Michael Tsai on Twitter: "@rob_rix Yes, that is nice."

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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.
Rob Rix‎ ‏@rob_rix 19 Aug 2015

@mjtsai And if it’s dispatched statically it can be inlined.
Rob Rix‎ ‏@rob_rix 19 Aug 2015

@mjtsai And it’s more composable since batching/mutation detection implementation details aren’t surfaced in the generator API.

‏@mjtsai

@rob_rix Yes, that is nice.

10:15 AM - 19 Aug 2015

Michael TsaiVerified account