reset forest method

graph.cpp

@@ -196,4 +196,14 @@ bool Graph::is_out_of_forest(const ED::NodeId id) const
    ear_or_root_neighbor(matched_neighbor(id)) == matched_neighbor(id);
 }
 
+void Graph::reset_forest()
+{
+   NodeId cur_id = 0;
+   for(auto & node : _nodes) {
+      node._ear_or_root_neighbor = cur_id;
+      node._root_of_ear_component = cur_id;
+      // Note that we do not change the matching itself here
+   }
+}
+
 } // namespace ED

graph.hpp

@@ -175,6 +175,8 @@ public:
    bool is_inner(NodeId const id) const;
 
    bool is_out_of_forest(NodeId const id) const;
+
+   void reset_forest();
 private:
    std::vector<Node> _nodes;
    size_type _num_edges;