Benjamin Bannier created MESOS-3886:
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             Summary: ProcessReference provides unsafe operator bool
                 Key: MESOS-3886
                 URL: https://issues.apache.org/jira/browse/MESOS-3886
             Project: Mesos
          Issue Type: Bug
          Components: libprocess
            Reporter: Benjamin Bannier


The class `process::ProcessReference` provides an unsafe `operator bool() 
const`.

The way it is currently implemented it e.g.

* makes a `ProcessReference` implicitly convertible to anything implicitly 
constructible from a `bool`, or
* makes any two `ProcessReferences` compare equal.

The current implementation should probably be replaced with something following 
the safe bool idiom.



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