Hello James, Thanks for your quick answer. I struggled for several hours to find the answer you gave me within minutes and would have loved to get the answer this quickly, but I already fixed that problem. ): If you notice the error is regarding the visitor, not the ColorMap. It is looking for the initialize_vertex and start_vertex method within the visitor. Yet, I use the same visitor for a depth_first_search without the 3rd and 4th parameters and I don’t get an error… I get the error even if I declare those methods within my BFSTreeVisitor, (I suppose because of the visitor() cast). So here’s my question: do I need to use another visitor cast? If so, which one and why? Jean-Olivier Racine HYPERLINK "mailto:joracine@humancad.com"joracine@humancad.com HumanCAD development team Nexgen Ergonomics Inc. HYPERLINK "http://www.nexgenergo.com/"http://www.nexgenergo.com/ From: boost-users-bounces@lists.boost.org [mailto:boost-users-bounces@lists.boost.org] On Behalf Of James Sutherland Sent: Tuesday, May 06, 2008 12:49 PM To: boost-users@lists.boost.org Subject: Re: [Boost-users] Wrong visitor type when using depth_first_search with start location On May 6, 2008, at 10:31 AM, Jean-Olivier Racine wrote: I have an adjacent_list graph define as such: typedef adjacency_list<vecS, listS, bidirectionalS, property<vertex_index_t, int, ObjectID>, Relationships> Graph; I just spent a while learning this the hard way too. See the FAQ: HYPERLINK "http://www.boost.org/doc/libs/1_35_0/libs/graph/doc/faq.html"http://www.boo st.org/doc/libs/1_35_0/libs/graph/doc/faq.html Specifically, look at item number 5. I am using bundled properties, and had to add an "index" variable to the vertex property to use it with a listS or setS vertex map. There was an old post on the list that I found somewhat helpful: HYPERLINK "http://thread.gmane.org/gmane.comp.lib.boost.user/27916/focus=27967"http:// thread.gmane.org/gmane.comp.lib.boost.user/27916/focus=27967 James No virus found in this incoming message. Checked by AVG. Version: 7.5.524 / Virus Database: 269.23.9/1417 - Release Date: 5/6/2008 8:07 AM No virus found in this outgoing message. Checked by AVG. Version: 7.5.524 / Virus Database: 269.23.9/1417 - Release Date: 5/6/2008 8:07 AM