- basic * duplicate() const;
- void printraw(ostream & os) const;
- void printtree(ostream & os, unsigned indent) const;
- void print(ostream & os, unsigned upper_precedence=0) const;
- bool info(unsigned inf) const;
-protected:
- int compare_same_type(const basic & other) const;
- bool is_equal_same_type(const basic & other) const;
- unsigned calchash(void) const;
- ex subs(const lst & ls, const lst & lr) const;
+ /** Check whether index is symbolic (not numeric). */
+ bool is_symbolic(void) const {return symbolic;}