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https://issues.apache.org/jira/browse/ARROW-5508?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16917538#comment-16917538
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Micah Kornfield commented on ARROW-5508:
----------------------------------------
My only comment on this is might pay to sketch out what iteration looks like in
each case.
Using StopIteration and Result I think you get something like:
while (RETURN_IF_NOT_STOPPED_ERROR(v, iter.next()) {
doSomethingWith(v)
}
Not sure if the macros to make that nice are even vaible.
"As for signaling completion without consuming a value, well, the problem is
that not all iterators may support that. Is there a use case where this
matters?"
I think in many cases this can be solved with a "peek" style iterator?
> [C++] Create reusable Iterator<T> interface
> --------------------------------------------
>
> Key: ARROW-5508
> URL: https://issues.apache.org/jira/browse/ARROW-5508
> Project: Apache Arrow
> Issue Type: Improvement
> Components: C++
> Reporter: Wes McKinney
> Priority: Major
> Fix For: 0.15.0
>
>
> We have various iterator-like classes. I envision a reusable interface like
> {code}
> template <typename T>
> class Iterator {
> public:
> virtual ~Iterator() = default;
> virtual Status Next(T* out) = 0;
> }
> {code}
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