[Rcpp-devel] object '.pointer' not found

[Romain Francois]

Hmm. Actually my toy example was not right (it is getting late in 
france, I think I've had enough screen time for one day). This works for 
me :

require(inline)
require(Rcpp)
fx <- cxxfunction(, "", includes = '

     class Foo {
     public:
         Foo() : x(2.0){}
         Foo(double x_) : x(x_){}
         double foo(){ return 0.0 ; }

     private:
         double x ;
     } ;

     RCPP_MODULE(bar){

         class_<Foo>("Foo")
             .constructor()
             .constructor<double>()
             .method( "foo", &Foo::foo ) ;
     }


', plugin = "Rcpp" )
m <- Module( "bar", getDynLib(fx), mustStart = TRUE )
Foo <- m$Foo
new( Foo )

Does the example work for you ?

Romain

Le 02/12/10 21:34, Romain Francois a écrit :
> Apparently, creation of the object works, but the show method for the
> class has a problem, so you should be able to do:
>
> obj <- new(Module("GPU_BAYES",'gpuBayes')$data3)
>
> Can you confirm ? (I only tried on a toy example)
>
> but then when you print the object, it bombs out. I'm narrowing this
> down, probably because of some oversight in the initialize method.
>
> Romain
>
> Le 02/12/10 20:36, Romain Francois a écrit :
>> That's odd that it only happens for your package. Guess #2 is that it
>> might be a namespace issue. Can you try adding:
>>
>> import(methods)
>> import(Rcpp)
>>
>> to your NAMESPACE file
>>
>> Romain
>>
>> Le 02/12/10 20:31, Andrew Redd a écrit :
>>> That exposes the data3 class, but does not solve the pointer problem.
>>>
>>> On Thu, Dec 2, 2010 at 12:24 PM, Romain Francois
>>> <romain at r-enthusiasts.com <mailto:romain at r-enthusiasts.com>> wrote:
>>>
>>> Le 02/12/10 20:05, Andrew Redd a écrit :
>>>
>>> I updated to the new Rcpp 0.8.9 then added a new function to my
>>> class.
>>> It compiles fine the Module is found and loads the class
>>> definition
>>> seems to be there, but when I try to create a instance of the
>>> class I
>>> get the error:
>>>
>>> R> new(Module("GPU_BAYES",'gpuBayes')$data3)
>>> Error in get(".pointer", envir = env) : object '.pointer' not found
>>>
>>> Any Ideas what might be wrong here? That's a rather vague
>>> error. The
>>> traceback gives
>>>
>>> > traceback()
>>> 3: get(".pointer", envir = env)
>>> 2: function (object)
>>> standardGeneric("show")(<S4 object of class "Rcpp_data3">)
>>> 1: function (object)
>>> standardGeneric("show")(<S4 object of class "Rcpp_data3">)
>>>
>>>
>>> Thanks,
>>> Andrew
>>>
>>>
>>> In the Rcpp-modules vignette, that has been considerably updated in
>>> the last version of Rcpp (part of the 8661 new lines of code), we
>>> suggest to have this in your .onLoad:
>>>
>>> # grab the namespace
>>> NAMESPACE <- environment()
>>>
>>> .onLoad <- function(libname, pkgname){
>>> # load the module and store it in our namespace
>>> yada <- Module( "GPU_BAYES" )
>>> populate( yada, NAMESPACE )
>>> }
>>>
>>> and the "data3" class is directly exposed in the namespace of your
>>> package, so that you can do:
>>>
>>> new( data3 )
>>>
>>> Does that work ?
>>>
>>>
>>> Otherwise, maybe you can try adding mustStart = TRUE to the call to
>>> Module.


-- 
Romain Francois
Professional R Enthusiast
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http://romainfrancois.blog.free.fr
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