[Rcpp-devel] Using module with std::vector<Mytype> when Mytype has children with inheritence

[Robin Girard]

Hello list, 
I'm having troubles using module on a class that redefines a vector of Mytype where Mytype is type that has several children types. Mytype has only methods while cihldren inherit methods and have fields that are double or integer or string. 

- when I remove inheritance everything work fine. 
- with inheritance, when I remove the push_back function redeclaration everything works fine (only with access methods size, vec_get, and constructors)
- I am using the .derives in the module definitions

I understand that I fully fall into the known shortcomming annouced in the Rcpp module vignette, I have tryed to read more about wrap (where my problem seems to be) digging into RcppArmadillo and RcppGSL, but it's a bit over my level of understanding for now since I'm new to cpp and don't fully understand template programming. I would like to know if there is a simple workaround in my case. 

The end of the error message in case this helps (Mytype is consumptionMean): 

C:/R/R-2.15.2/library/Rcpp/include/Rcpp/internal/wrap.h:882:96:   instantiated from 'SEXPREC* Rcpp::module_wrap(const T&) [with T = consumptionMean, SEXP = SEXPREC*]'
C:/R/R-2.15.2/library/Rcpp/include/Rcpp/module/Module_generated_CppMethod.h:104:138:   instantiated from 'SEXPREC* Rcpp::CppMethod1<Class, OUT, U0>::operator()(Class*, SEXPREC**) [with Class = consumptionMean_vec, OUT = consumptionMean, U0 = int, SEXP = SEXPREC*]'
Mymodules.cc:84:1:   instantiated from here
C:/R/R-2.15.2/library/Rcpp/include/Rcpp/internal/wrap.h:451:11: error: passing 'const consumptionMean' as 'this' argument of 'consumptionMean::operator SEXP()' discards qualifiers

Best 
R.

Dr. Girard Robin
Chargé de Recherche

MINES-ParisTech / Département Energétique et Procédés / PERSEE / Groupe ERSEI
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