Joe McDonnell created IMPALA-13976:
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             Summary: Replace boost::function/bind/mem_fn with the standard 
library
                 Key: IMPALA-13976
                 URL: https://issues.apache.org/jira/browse/IMPALA-13976
             Project: IMPALA
          Issue Type: Task
          Components: Backend
    Affects Versions: Impala 5.0.0
            Reporter: Joe McDonnell


The standard library now supports std::function/bind/mem_fn that is equivalent 
to boost's functionality. There are a few minor differences, but it is mostly a 
drop-in replacement. 

Some differences:
 # Placeholders _1 and _2 are in the std placeholders namespace
 # boost::function uses an empty() method to tell if it is unset. Instead, 
std::function can be compared to nullptr.

One upside of switching is that std::function properly supports nullptr where 
boost requires NULL. It is one of the few locations where using nullptr instead 
of NULL matters.



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