Method set_na

inst/include/Rcpp/String.h:533–539

        inline void set_na() {
            data = NA_STRING;
            Rcpp_PreciousRelease(token);
            token = Rcpp_PreciousPreserve(data);
            valid = true;
            buffer_ready = false;
        }


        inline SEXP get_sexp_impl() const {