Le 02/06/11 22:31, Douglas Bates a écrit :
Sorry for the long subject line but I hope it describes what I want to
do. I have a C++ class, dgTMatrix, that is exported in a module
definition.
RCPP_MODULE(RcppSp) {
...
class_<dgCMatrix>("dgCMatrix")
...
;
}
Many of the methods for this class return other members of this class.
Can I create a new instance of the reference class in R from within
the module? I'm sure it is possible, I'm just wondering if there is
an easy way to do this without duplicating large chunks of the code in
Rcpp/src/Module.cpp. Can i somehow clone the SEXP representing the
current instance then swap the external pointer to the C++ object?
As part of the changes I've made today [see the post "returning pointers
in module methods" ], there is this function you might be interested in
(in Module.h):
namespace internal {
template <typename Class>
SEXP make_new_object( Class* ptr ){
Rcpp::XPtr<Class> xp( ptr, true ) ;
Function maker = Environment::Rcpp_namespace()[ "cpp_object_maker"] ;
return maker( typeid(Class).name() , xp ) ;
}
}
Maybe I should make it more public (i.e not have it in internal).
Anyway, if you give this function a pointer to an instance of a class
that has been exposed through modules, it will create the associated R
ref class object.
Romain
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Romain Francois
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