I uploaded another version of dimension.hpp. If there are any problems let me know. I hope that these optimizations are sufficient.

Hi Steven, This new version fixes the problems I noted with the previous version and looks very nice - I haven't had a chance to rigorously compare compile times, but it seems subjectively faster. With your permission, after I've had a chance to run a couple of torture tests, I'd like to include it for the next release... Naturally, I'll acknowledge your contribution in the documentation. Regards, Matthias