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

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.0.0
• Fix Version/s: 3.0.0
• Component/s: C++
• Labels: pull-request-available
• External issue URL: https://github.com/apache/arrow/issues/26459
• Assignee: Ben Kietzman
• Reporter: Ben Kietzman
• Created: 03/Nov/20 20:21
• Updated: 11/Jan/23 08:13
• Resolved: 12/Nov/20 19:11

Description

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.

Issue Links

• links to: GitHub Pull Request #8591