oups wrong, suppress my last message. R.
----- Mail original ----- De: "Robin Girard" <robin.gir...@mines-paristech.fr> À: rcpp-devel@lists.r-forge.r-project.org Envoyé: Mercredi 3 Avril 2013 20:07:14 Objet: Re: [Rcpp-devel] Module with vector of a class with inheritance, how to avoid slicing additional remark : if operator SEXP() ; is added to class father, children1_t, and children2_t the solution with XPtr compiles but gives the same result as the solution with shared_ptr (i.e. slicing) R. ----- Mail original ----- De: "Robin Girard" <robin.gir...@mines-paristech.fr> À: rcpp-devel@lists.r-forge.r-project.org Cc: "Robin GIRARD" <robin.gir...@mines-paristech.fr> Envoyé: Mercredi 3 Avril 2013 18:43:32 Objet: Module with vector of a class with inheritance, how to avoid slicing I am still working on my vector of a class father with inheritance (polymorphic subclasses ?). I created an exemple below that works fine but I face the known problem of "slicing" as named here : http://stackoverflow.com/questions/10154977/c-vector-with-inheritance and fail to implement the proposed solution. I have 2 tried 2 things and ended up with 2 questions: Question 1 - I tryed the solution proposed in the link with make_shared and shared_ptr. I had to add PKG_CXXFLAGS=-g -std=c++0x since my MinGW compiler did not find any -std=c++11. I got no compilation error but when I run the code it slices my children class : > res=new("Rcpp_vector_Of_father") > res$push_back(new("Rcpp_father")) > res$push_back_children1_t(new("Rcpp_children1_t")) > res$WhoAmI(1) father > res$WhoAmI(0) father > > res[[1]]$WhoAmI() father > res[[0]]$WhoAmI() father Question 2 - I tryed a solution with XPtr (although I'm not sure how this works) and got the following error at the module compilation example_mod_consumption.cpp: In member function 'void vector_Of_father::push_back_children1_t(children1_t)': example_mod_consumption.cpp:80:53: error: no matching function for call to 'std::vector<Rcpp::XPtr<father> >::push_back(Rcpp::XPtr<children1_t>)' below are the code for the two approach and at the end the code of the module. -------------------- Solution with XPtr #include <Rcpp.h> using namespace std; using namespace Rcpp; class father ; class children1_t; class children2_t ; class vector_Of_father; RCPP_EXPOSED_CLASS(father) RCPP_EXPOSED_CLASS(children1_t) RCPP_EXPOSED_CLASS(children2_t) RCPP_EXPOSED_CLASS(vector_Of_father) class father { public: ~father(){}; father(){}; father(father const & x) {}; void WhoAmI() const{ Rcout<<"father"<<endl; }; }; class children1_t : public father { public: ~children1_t(){}; children1_t(){}; children1_t(children1_t const & x){}; void WhoAmI() const{ Rcout<<"son1"<<endl; }; }; class children2_t : public father { public: ~children2_t(){}; children2_t(){}; children2_t(children2_t const & x){}; void WhoAmI() const{ Rcout<<"son2"<<endl; }; }; class vector_Of_father { public: std::vector<XPtr<father> > MyfatherList_; //std::vector<shared_ptr<father> > MyfatherList_; ~vector_Of_father(){}; vector_Of_father() : MyfatherList_(){}; father vec_get( int i) { return(*(MyfatherList_.at(i))); }; void WhoAmI(int i) const { MyfatherList_[i]->WhoAmI(); }; int size(){ return(MyfatherList_.size()); }; void push_back(father func){ MyfatherList_.push_back(XPtr<father>(&func)); }; void push_back_children1_t(children1_t func){ MyfatherList_.push_back(XPtr<children1_t>(&func)); }; }; -------------------- Solution with make_shared and shared_ptr only the class vector_of_father is different also #include <memory> is added after Rcpp.h include. class vector_Of_father { public: std::vector<shared_ptr<father> > MyfatherList_; ~vector_Of_father(){}; vector_Of_father() : MyfatherList_(){}; father vec_get( int i) { return(*(MyfatherList_.at(i))); }; void WhoAmI(int i) const { MyfatherList_[i]->WhoAmI(); }; int size(){ return(MyfatherList_.size()); }; void push_back(father func){ MyfatherList_.push_back(make_shared<father>(func)); }; void push_back_children1_t(children1_t func){ MyfatherList_.push_back(make_shared<children1_t>(func)); }; }; -------------- the module code RCPP_MODULE(mod_example2){ using namespace Rcpp; class_<father>( "father" ) //constructors .constructor() .method("WhoAmI",&father::WhoAmI) ; class_<children1_t>( "children1_t" ) .derives<father>("father" ) //constructors .constructor() .method("WhoAmI",&children1_t::WhoAmI) ; class_<children2_t>( "children2_t" ) .derives<father>("father" ) //constructors .constructor() .method("WhoAmI",&children2_t::WhoAmI) ; class_<vector_Of_father>( "vector_Of_father") .constructor() // .constructor<int>() .method( "size", &vector_Of_father::size) // .method("capacity", &cplfunctionvec::capacity,"Return size of allocated storage capacity. Returns the size of the storage space currently allocated for the vector, expressed in terms of elements.") // .method( "max_size", &cplfunctionvec::max_size) .method( "WhoAmI",&vector_Of_father::WhoAmI ) //.method( "test",&vector_Of_father::test ) .method( "push_back", &vector_Of_father::push_back ) .method("push_back_children1_t",&vector_Of_father::push_back_children1_t) // .const_method( "at", &cplfunctionvec::at ) .method("[[",&vector_Of_father::vec_get) // .method("[[<-",&vector_Of_father::vec_set) ; } Dr. Girard Robin Chargé de Recherche MINES-ParisTech / Département Energétique et Procédés / PERSEE / Groupe ERSEI Centre Procédés, Energies Renouvelables et Systèmes Energétiques (PERSEE) Center for Processes, Renewables Energies and Energy Systems Renewable Energies & Smartgrids (ERSEI) 1 Rue Claude Daunesse - CS 10207 - F-06904 Sophia Antipolis Cedex Tel: +33.4.93.67.89.64 (~99), Fax: +33.4.93.95.75.35 e-mail : robin.gir...@mines-paristech.fr web page perso http://www.mines-paristech.fr/Services/Annuaire/&?id=8828 statoverflow : http://stats.stackexchange.com/users/223/robin-girard web page centre PERSEE : http://www.cep.mines-paristech.fr/ linkedin : http://www.linkedin.com/profile/view?id=14907272&trk=tab_pro Le lien vaut mieux que le bien. ________________________________________________________ CONFIDENTIALITY : This e-mail and any attachments are confidential and may be privileged. 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