std::vector<Node> nodes;
+ /**
+ * returns Node index nearest to reference_point or -1 if not applicable
+ */
+ int get_nearest_node_no(Vector reference_point) const;
+
+ /**
+ * returns Node index farthest from reference_point or -1 if not applicable
+ */
+ int get_farthest_node_no(Vector reference_point) const;
+
private:
friend class PathWalker;