Method is_readonly

inst/include/Rcpp/Module.h:444–444

        virtual SEXP get(Class* ) { throw std::range_error("cannot retrieve property"); }
        virtual void set(Class*, SEXP) { throw std::range_error("cannot set property"); }
        virtual bool is_readonly(){ return false; }
        virtual std::string get_class(){ return ""; }

        std::string docstring ;