r - Exposing headers with C++ classes to other packages -

i writing custom functionality r package. classes inherit classes in package, i.e.

package orig has src/myclass.h class

class myclass { public:     virtual int blub(int bla) { return(bla + 1); } } 

i want package derivedpackage use

#include "orig/myclass.h" class derivclass : public myclass { ... } 

i aware need in description:

linkingto: orig 

and somewhere guess [[rcpp:depends(orig)]] in src/derivclass.h or so.

and aware original package orig need headers in inst/include.

questions:

• what else need add orig?
• is there automated way via rcpp attributes headers inst/include? know [[rcpp::interfaces(r, cpp)]] exists doesn't seem apply exporting classes, functions; putting [[rcpp::export]] in front of class doesn't seem doing anything.

for simplicity let's assume maintain both packages don't want have derivedpackage functionality in orig because more specific , useful special case.