+ /** Check whether this node involves anything non symmetric. */
+ bool has_nonsymmetric() const;
+ /** Check whether this node involves a cyclic symmetry. */
+ bool has_cyclic() const;
+
+ /** Save (a.k.a. serialize) object into archive. */
+ void archive(archive_node& n) const;
+ /** Read (a.k.a. deserialize) object from archive. */
+ void read_archive(const archive_node& n, lst& syms);