I am using the default depth_first_search visitor with an graph setup as follows: typedef property< vertex_index_t, uint32_t, property< vertex_name_t, boost::shared_ptr<Component> > > VertexProperty; typedef adjacency_list<setS, // OutEdgeList setS, // VertexList directedS, // Directed VertexProperty> // VertexProperties Graph_Type; typedef graph_traits<Graph_Base::Graph_Type>::vertex_descriptor Vertex; typedef graph_traits<Graph_Base::Graph_Type>::edge_descriptor Edge; The graph contains Component class objects. I want to visit each Component and execute the function run(). The test graph I have is a simple two node graph: node A ---> node B When I use the depth_first_search with my visitor I see that it only visits node A. I do not know why this is the case. I have only implemented the discover_vertex function in it. I have std::cout messages for telling me various steps of run() have been done. I cannot see how to have the visitor say what its doing (e.g. "I'm in node A. Executing run(). Considering moving to node B). What I need assistance on is how do I debug my visitor? I am only sending the graph and the visitor to my call to depth_first_search: // Let Graph Visitor run through the Graph // (visit Input graph) depth_first_search (test_graph_ptr->get_Graph(), visitor(vis)); Stephen