Review Request 38154: Switched to type traits for checking whether a type is a protobuf message.

[Alexander Rukletsov]

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Review request for mesos and Michael Park.


Bugs: MESOS-3312
    https://issues.apache.org/jira/browse/MESOS-3312


Repository: mesos


Description
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See summary.


Diffs
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  3rdparty/libprocess/3rdparty/stout/include/stout/protobuf.hpp 
57d5fdf45273c620655b44b5f5572290cffa4bf6 

Diff: https://reviews.apache.org/r/38154/diff/


Testing
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make check (Mac OS 10.10.4)


Thanks,

Alexander Rukletsov