// Copyright 2003, Trustees of Indiana University
// Please see the license in the file ../LICENSE

// Visitor concept from BGL

public interface Visitor<Graph,Vertex,Edge> {
  void initialize_vertex(Vertex u, Graph g);
  void discover_vertex(Vertex u, Graph g);
  void examine_edge(Edge e, Graph g);
  void tree_edge(Edge e, Graph g);
  void non_tree_edge(Edge e, Graph g);
  void gray_target(Edge e, Graph g);
  void black_target(Edge e, Graph g);
  void finish_vertex(Vertex u, Graph g);
}