- bool info(unsigned inf) const;
- ex eval_indexed(const basic & i) const;
- bool contract_with(exvector::iterator self, exvector::iterator other, exvector & v) const;
+ bool info(unsigned inf) const override;
+ ex eval_indexed(const basic & i) const override;
+ bool contract_with(exvector::iterator self, exvector::iterator other, exvector & v) const override;
+protected:
+ unsigned return_type() const override { return return_types::commutative; }