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https://issues.apache.org/jira/browse/ARROW-5508?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16916031#comment-16916031
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Antoine Pitrou commented on ARROW-5508:
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We could also take a page from Python and have a special
{{Status::StopIteration}} to signal completion.
I also think it's essential to be able to return errors - either via {{Status}}
or {{Result<T>}}.
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?
> [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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