Hi I just wanted to praise boost::multi_index I think it's a great container. I'm starting to wonder now how I lived without it previously (with many individual maps and much complexity I guess) :) Regards. -- Pedro Larroy Tovar, pedro at larroy dot com | http://pedro.larroy.com/ * Las patentes de programación son nocivas para la innovación * http://proinnova.hispalinux.es/