[jira] [Commented] (ARROW-10484) [C++] Future<{void,Status}> could be more generic

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

    [ https://issues.apache.org/jira/browse/ARROW-10484?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17225652#comment-17225652 ] 

Ben Kietzman commented on ARROW-10484:
--------------------------------------

[~apitrou]

> [C++] Future<{void,Status}> could be more generic
> -------------------------------------------------
>
>                 Key: ARROW-10484
>                 URL: https://issues.apache.org/jira/browse/ARROW-10484
>             Project: Apache Arrow
>          Issue Type: Improvement
>          Components: C++
>    Affects Versions: 2.0.0
>            Reporter: Ben Kietzman
>            Assignee: Ben Kietzman
>            Priority: Major
>             Fix For: 3.0.0
>
>
> The members of {{Future<{void,Status}>}} differ from other instantiations of {{Future<>}} since they contain only a Status and not a value. This is reasonable, however it complicates generic usage of {{Future<>}} since special cases must be added for the different interfaces. IMHO it'd be acceptable to provide an empty "ValueType" (or maybe {{std::nullptr_t}} to follow the precedent of Datum's default state) for those specializations to keep the interface generic.



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