Maybe a dumb question, but what is the vis object?The visitor object . See http://tinyurl.com/nutww8 .The boost: bgl depth first search example. Could you post a complete compilable example? It's a littlehard to figure out exactly what you're doing.In Christ,Steven Watanabe_______________________________________________Boost-users mailing listBoost-users@lists.boost.orghttp://listarchives.boost.org/mailman/listinfo.cgi/boost-users