[jira] [Commented] (ARROW-5508) [C++] Create reusable Iterator interface

["Liya Fan (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/ARROW-5508?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16856229#comment-16856229 ] 

Liya Fan commented on ARROW-5508:
---------------------------------

[~wesmckinn], thanks for the good point.

What is the standard way to know if there is a next element in the 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
>            Assignee: Wes McKinney
>            Priority: Major
>             Fix For: 0.14.0
>
>
> 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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