[Rcpp-devel] Initiate NumericMatrix in class constructor from S4 slot
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 ? 08:14, Simon Zehnder <szehnder at uni-bonn.de> a ?crit :
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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