[Rcpp-devel] Persistent C++ objects within R/Rcpp?

Glenn Lawyer lawyer at mpi-inf.mpg.de
Tue Jun 26 09:52:16 CEST 2012

On 06/26/2012 02:00 AM, Dirk Eddelbuettel wrote:
> Andy,
> it seems you simply want a creator function in C++ which creates a
> simulation object, which you then modify and alter in R, possibly give back
> to C++ etc.  Is that correct?
> In the case, Rcpp can help easily.

I second Dirk's answer, with the following addition. My 
"simulation object" (SO) was a bit big, and I was loosing a lot of 
time to copy operations (not sure if this is Rcpp's fault or my 
lack of coding skill). My solution was to use classes. I code, in 
C++, my SO as a class. I use the Rcpp class interface to write R 
wrappers to the functions which manipulate the state of the SO.

To run a simulation, I load the module into R, create an instance 
of the class, then run the simulation via the R functions which 
are linked to the SO functions.

I am sure there is a more elegant way, but this approach works.


It is difficult to find a black cat in a dark room,
especially if there is no cat.
   -- Chinese proverb

   Dr. Glenn Lawyer
   +352 661 967 244
   Max-Planck-Institut für Informatik
   Computational Biology and Applied Algorithmics
   Campus E1 4
   66123 Saarbrücken, Germany

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