Michael Tsai
Is there any optimization like NSFastEnumeration (batch fetching, detecting mutations) in Swift? SequenceType doesn’t seem to do that.
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@mjtsai The generator can batch & detect mutations. Often it’ll live on the stack, so .next() is not much worse than incrementing the ptr.
Rob Rix
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@mjtsai As I understand it, it doesn’t necessarily have to send a message. It may not even need indirection through a vtable. - View other replies
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@mjtsai And if it’s dispatched statically it can be inlined. - View other replies
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@rob_rix Wonder how often that is. I would think you’re usually passed in a collection and don’t know its type. -
@mjtsai Technically that _can_ be specialized at compile time (and IIRC the compiler has begun to in some cases). -
@rob_rix How can you do that if the sequence you receive is not final? -
@mjtsai Given func f<C: SequenceType>(c:C){ …loop over c… }, compile f_Array & f_Set, dispatch at call to f instead of within the loop. -
@rob_rix So it doesn't work if f takes an array instead of a SequenceType? -
@mjtsai Yeah you’d have to have a generic fallback for when the thing calling the generic thing is itself generic. Diminishing returns! - Show more
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