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https://issues.apache.org/jira/browse/ARROW-4146?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17661170#comment-17661170
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Rok Mihevc commented on ARROW-4146:
-----------------------------------
This issue has been migrated to [issue
#20732|https://github.com/apache/arrow/issues/20732] on GitHub. Please see the
[migration documentation|https://github.com/apache/arrow/issues/14542] for
further details.
> [C++] Extend visitor functions to include ArrayBuilder and allow callable
> visitors
> ----------------------------------------------------------------------------------
>
> Key: ARROW-4146
> URL: https://issues.apache.org/jira/browse/ARROW-4146
> Project: Apache Arrow
> Issue Type: Improvement
> Components: C++
> Reporter: Ben Kietzman
> Priority: Minor
>
> In addition to accepting objects with Visit methods for the visited type,
> {{Visit(Array|Type)}} and {{Visit(Array|Type)Inline}} should accept objects
> with overloaded call operators.
> In addition for inline visitation if a visitor can only visit one of the
> potential unboxings then this can be detected at compile time and the full
> type_id switch can be avoided (if the unboxed object cannot be visited then
> do nothing). For example:
> {code}
> VisitTypeInline(some_type, [](const StructType& s) {
> // only execute this if some_type.id() == Type::STRUCT
> });
> {code}
> Finally, visit functions should be added for visiting ArrayBuilders
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