[Rcpp-devel] Fwd: Re: Making objects in the C++ "side" persistent

Martyn Plummer plummerm at iarc.fr
Wed Jun 18 17:47:38 CEST 2014

On Wed, 2014-06-18 at 09:09 +0900, Martin Jakt wrote:
> On Tuesday 17 Jun 2014 19:34:59 Krzysztof Sakrejda wrote:
> > On Tue, Jun 17, 2014 at 7:30 PM, Martin Jakt <mjakt at z2.keio.jp> wrote:
> > >> if (identical(data_ptr, new('externalptr'))) return("No data available
> > >> to retrieve.")
> > > 
> > > thanks. I think it would have taken me a long time to come up with that
> > > from the documentation. It seems curious there's no direct way.
> > 
> > Yes... so it comes with the caveat that I'm not sure if this is
> > documented behavior
> > and the R developers might decide to change it (?)  If this is somehow
> > documented or if there is an Rcpp implementation which gets closer to
> > documented behavior I would love to know.
> that's a good point. Perhaps a question for the r-dev mailing group. I've not 
> registered for it, but seems like it might be a good idea.

There is no R-level API for external pointers. You are expected to
questions like "is it null?" on the C side.


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