[jira] [Assigned] (ARROW-4146) [C++] Extend visitor functions to include ArrayBuilder and allow callable visitors

["Benjamin Kietzman (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/ARROW-4146?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Benjamin Kietzman reassigned ARROW-4146:
----------------------------------------

    Assignee: Benjamin Kietzman

> [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: Benjamin Kietzman
>            Assignee: Benjamin 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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