westonpace commented on pull request #10814:
URL: https://github.com/apache/arrow/pull/10814#issuecomment-887776252


   > > LGTM. Can I ask, for my own learning, why you would choose to use 
decltype instead of `std::result_of`?
   > 
   > `std::result_of` is deprecated in c++17 and removed in c++20. See 
https://issues.apache.org/jira/browse/ARROW-13444
   
   Ah, yes, thank you.  I should have been more clear and said 
`arrow::detail::result_of` but looking closer I see that utility is in 
`future.h` and not in a more generally accessible utility class.


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