On Monday 04 October 2004 13:42, Jarosław Staniek wrote: > http://www.iidea.pl/~js/kexi/download/tristate.h This looks a lot like the boost::tribool class (not yet in boost, but likely to be soon). Documentation for that is here: http://www.boost.org/regression-logs/cs-win32_metacomm/doc/html/tribool.html Richard