Hi, I'm trying to write an edge_iterator in order to load a CSR graph from a GraphViz by using the add_edges method. So far, I successfully write a edge_iterator so you can iterate on it and dereference it to get either a pair of vertex_descriptor or a edge label. However, if it try to use this iterator as arguments for the method add_edges of CSR graph, I got cryptic errors and I don't know how to solve them :-/ You can find the code that produce these errors here: http://tinyurl.com/csr-add-edges-error I will appreciate any help to understand what is going wrong or to write an edge_iterator that actually works with add_edges. Thanks. Regards, P.S.: I use Boost graph library 1.42 installed from Ubuntu 10.10 repositories. -- Johan () ascii ribbon campaign - against html e-mail /\ www.asciiribbon.org - against proprietary attachments