[Rprotobuf-yada] skeletic implementation of proto messages using external pointers

[Romain François]

Hello,

(Don't get too excited about the title)

I've commited some R and C (maybe need to C++ it at some point) that 
prepare the space for mirroring proto messages as R S4 objects of class 
"protobufMessage".

The design is much inspired from the new features of rJava. Here are 
some insights. The "P" function takes either a message type (i.e. 
"tutorial.Person") or a proto file, goes C internal, grabs a pointer to 
some descriptor object (not sure what this will be right now), and 
creates an R object of S4 class "protobufDescriptor".

Then, we can throw the created descriptor into "new", made generic by 
the package. So you'd create a Person message like this :

message <- new( P("tutorial.Person" ) )

I've also added hooks so that

message$name

goes internal to grab the "name" field from the message.


Please note that at the moment, none of this is real, I now need to play 
with the headers of libproto to actually grab useful information. Those 
are essentially placeholders at the moment. I told you not to get too 
excited...

Romain


-- 
Romain Francois
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http://romainfrancois.blog.free.fr
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