On Mon, Oct 22, 2018 at 2:41 AM Eric Raymond <[email protected]> wrote:
> 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)
> }
>
The 'obvious' way is not something I'd consider. The 'concise' way works
today, provided iterator function returns a slice or a map.
I'd probably write something like
for item := someSetup(selector); item.Next(); {
DoSomethingWith(item)
}
Item type can be whatever is needed, like `struct{i, v int}` or something
much more complex. I don't think that this calls for a language change.
--
-j
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