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https://issues.apache.org/jira/browse/ARROW-6558?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Benjamin Kietzman resolved ARROW-6558.
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Fix Version/s: 0.15.0
Resolution: Fixed
Issue resolved by pull request 5391
[https://github.com/apache/arrow/pull/5391]
> [C++] Refactor Iterator to a type erased handle
> -----------------------------------------------
>
> Key: ARROW-6558
> URL: https://issues.apache.org/jira/browse/ARROW-6558
> Project: Apache Arrow
> Issue Type: Improvement
> Components: C++
> Reporter: Benjamin Kietzman
> Assignee: Benjamin Kietzman
> Priority: Major
> Labels: pull-request-available
> Fix For: 0.15.0
>
> Time Spent: 5h 10m
> Remaining Estimate: 0h
>
> Since {{Iterator<T>}} is used as a base class for exported classes and is
> instantiated in both arrow.dll and arrow_dataset.dll we get multiple
> definition errors. The solution taken by MSVC's stl implementation in the
> similar case of {{std::function}} is type erasure. Since it's not a base
> class MSVC doesn't force public visibility of its members.
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