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Posted to issues@arrow.apache.org by "Benjamin Kietzman (Jira)" <ji...@apache.org> on 2019/09/13 19:19:00 UTC

[jira] [Created] (ARROW-6558) [C++] Refactor Iterator to a type erased handle

Benjamin Kietzman created ARROW-6558:
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             Summary: [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


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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