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

[Benjamin Kietzman (JIRA)]

    [ 
https://issues.apache.org/jira/browse/ARROW-5508?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16867739#comment-16867739
 ] 

Benjamin Kietzman commented on ARROW-5508:
------------------------------------------

3. A separate out parameter of type {{bool*}}

{code}
template <typename T>
class Iterator {
 public:
  virtual ~Iterator() = default;
  virtual Status Next(T* value, bool* done) = 0;
}
{code}

> [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
>
> 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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