I have a real-world case where I need Python style iterators for
performance. It's not good to eager-evaluate an event-list 259K items when
you know that in the typical case you're only going to select two or three
orders of magnitude fewer of them to be passed to a work function. (The
list is of commit events in a version-control repository; the selector
might be something like "commited within 24 hours of time t").
There's an obvious, clumsy way to do this by having a factory pass back a
stateful iterator object:
for iterator := IteratorFactory(selector); iterator.Continue();iterator.Next
(){
DoSomethingWith(iterator.Value())
}
What one would really like to be able to do, though, is much more concise:
for i, v := range iteratorFunction() {
DoSomethingWith(i, v)
}
Before I post an RFE, are there rejected iterator proposals I should read
so I don't waste anyone's time on stale ideas?
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