Re: [Rd] Using R_MakeExternalPtr

From: Seth Falcon <sfalcon_at_fhcrc.org>
Date: Wed, 25 Jul 2007 09:01:18 -0700

Jonathan Zhou <jonathan.zhou_at_utoronto.ca> writes:

> Hi all,
>
> I've been writing a package and I've run into a problem that I'm unsure how
> to solve. I am looking to pass a C++ class object to R so that it may be
> passed back to another C++ function later on to be used. I'm quite new to R
> and this is my first time writing a package, so I hope you can bear with me.
>
> The following is how I create the class and use R_MakeExternalPtr(). This
> occurs in a function called "soamInit":
> Session* sesPtr = conPtr->createSession(attributes);
> void* temp = session;

It isn't clear from your example, are you sure that temp is valid at this point?

> SEXP out = R_MakeExternalPtr(temp, R_NilValue, R_NilValue);

I was expecting to see:

      SEXP out = R_MakeExternalPtr((void *)sesPtr, R_NilValue, R_NilValue);

+ seth

-- 
Seth Falcon | Computational Biology | Fred Hutchinson Cancer Research Center
http://bioconductor.org

______________________________________________
R-devel_at_r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-devel
Received on Wed 25 Jul 2007 - 16:20:05 GMT

Archive maintained by Robert King, hosted by the discipline of statistics at the University of Newcastle, Australia.
Archive generated by hypermail 2.2.0, at Wed 25 Jul 2007 - 16:36:50 GMT.

Mailing list information is available at https://stat.ethz.ch/mailman/listinfo/r-devel. Please read the posting guide before posting to the list.