+ relational(const ex & lhs, const ex & rhs, operators oper=equal);
+
+ // functions overriding virtual functions from base classes
+public:
+ unsigned precedence() const override {return 20;}
+ bool info(unsigned inf) const override;
+ size_t nops() const override;
+ ex op(size_t i) const override;
+ ex map(map_function & f) const override;
+ ex subs(const exmap & m, unsigned options = 0) const override;
+
+ /** Save (a.k.a. serialize) object into archive. */
+ void archive(archive_node& n) const override;
+ /** Read (a.k.a. deserialize) object from archive. */
+ void read_archive(const archive_node& n, lst& syms) override;