Good to hear somebody else is trying to do or has tried to do this. I have 
defined hash/hash_map/hash_set in the section for the __BUILDERC__ (I named 
it _CPPBUILDER but same thing). 

Anyway I'm getting all sorts of E2238 errors (multiple declarations for 
hash<Key> and hash_map, etc). I'm trying to make sense of these errors in 
the context of protobuf. There errors first come when compiling, where the first thing it does is include hash.

In hopes of isolating the compile problem(s) I've taken the exact same hash 
related declarations and created a separate project (outside of protobuf). 
It builds fine in this case.

Might be a namespace issue. Not sure yet. 

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