There is no constructor of Matrix tht takes a SlotProxy. You can do it in two
steps perhaps.
SEXP tmp = classS4.slot("M_R") ;
M = tmp ;
Or use a specific cast:
> M((SEXP)classS4.slot("M_R"));
In any case, you should use an initialisation list in your constructor anyway,
something like:
> FirstClass::FirstClass(Rcpp::S4& classS4) : M( (SEXP)classS4.slot("M_R")) {}
Hiwever, i will add the missing constructor if this does not break anything
else.
Romain
Le 6 mars 2013 à 08:14, Simon Zehnder <[email protected]> a écrit :
> Dear Rcpp-Devels,
>
> I am a little confused right now with the following setting:
>
> I have a C++ class with for example the following header
>
> #include <RcppArmadillo.h>
>
> class FirstClass {
>
> public:
> Rcpp::NumericMatrix M;
>
> FirstClass(Rcpp::S4& classS4);
> ~FirstClass();
> }
>
> Then, in the .cc file I have:
>
> #include <RcppArmadillo.h>
> #include "FirstClass.h"
>
> FirstClass::FirstClass(Rcpp::S4& classS4) {
>
> M(classS4.slot("M_R")); // array M_R in R
> };
>
> FirstClass::~FirstClass(){};
>
> Now, my compiler always gives me an error:
>
> error: no match for call to ‘(Rcpp::NumericMatrix {aka Rcpp::Matrix<14>})
> (Rcpp::RObject::SlotProxy)’
>
>
> Do I have to create the Matrix in the constructor differently? I want to
> reuse memory allocated in R. Further, could the error be triggered by M_R
> being an array in R?
>
> Best
>
> Simon
>
>
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