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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