[ARROW-12655] [C++] Enhance arrow::internal::call_traits to support function pointers (and maybe ...?)

• Type: Improvement
• Status: Open
• Priority: Minor
• Resolution: Unresolved
• Component/s: C++
• External issue URL: https://github.com/apache/arrow/issues/18652
• Assignee: Unassigned
• Reporter: Weston Pace
• Created: 05/May/21 02:04
• Updated: 11/Jan/23 08:27

Description

We are relying on call_traits in Future::Then to help type check the callables passed in.  Adding support for function pointers would allow us to simplify code from

fut.Then([](const T& val) { return SomeCbFun(val); });

to...

fut.Then(SomeCbFun);