int ldegree(const ex & s) const override;
ex expand(unsigned options=0) const override;
ex coeff(const ex & s, int n=1) const override;
- ex eval(int level=0) const override;
+ ex eval() const override;
ex evalm() const override;
exvector get_free_indices() const override;
ex thiscontainer(const exvector & v) const override;