Henry Robinson has posted comments on this change.

Change subject: Avoid std::function when possible.
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Patch Set 1:

> I don't think we should never use it, but I think it is overkill for this use 
> case

The alternative implementation is more complex, in terms of lines of code and 
also wrt the need for a specialised construction pattern. 

Here, std::function serves the role of simplifying the implementation and the 
interface (what do I pass in? Oh, it's a function). Do you find the templated 
version more readable?

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Gerrit-MessageType: comment
Gerrit-Change-Id: If9dc034c2e094ea7f87f78d8d9101a71d8d2e295
Gerrit-PatchSet: 1
Gerrit-Project: Impala-ASF
Gerrit-Branch: master
Gerrit-Owner: Jim Apple <jbapple-imp...@apache.org>
Gerrit-Reviewer: Henry Robinson <he...@cloudera.com>
Gerrit-Reviewer: Jim Apple <jbapple-imp...@apache.org>
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