[jira] [Updated] (ARROW-15975) [C++] Document VisitArrayInline and type traits

["ASF GitHub Bot (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/ARROW-15975?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

ASF GitHub Bot updated ARROW-15975:
-----------------------------------
    Labels: pull-request-available  (was: )

> [C++] Document VisitArrayInline and type traits
> -----------------------------------------------
>
>                 Key: ARROW-15975
>                 URL: https://issues.apache.org/jira/browse/ARROW-15975
>             Project: Apache Arrow
>          Issue Type: Improvement
>          Components: C++
>    Affects Versions: 7.0.0
>            Reporter: Will Jones
>            Assignee: Will Jones
>            Priority: Major
>              Labels: pull-request-available
>             Fix For: 8.0.0
>
>          Time Spent: 10m
>  Remaining Estimate: 0h
>
> In ARROW-15952, we documented the {{ArrayVisitor}} and {{TypeVisitor}} classes. But as I discovered in [a cookbook PR|https://github.com/apache/arrow-cookbook/pull/166], you can't subclass these abstract visitors _and_ use type traits. Now I know why most visitor implementations within of Arrow don't subclasses these.
> We should instead suggest users simply use the {{VisitArrayInline}} and {{VisitTypeInline}} with their visitors, and ignore the {{ArrayVisitor}} and {{TypeVisitor}} classes and associated {{Accept()}} methods. In fact, can we deprecate (or even remove) those? Do they add anything valuable?



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