Re: [Boost-users] tribool question

Serge Skorokhodov wrote:

Just some follow-up explaining why I need tribool with 'unknown' indetermined state sematics:

I'm working in a domain (HL7 v3) that explicetely contain a type of boolean value that can be null (of several null flawors: just unknown, patient not asked, patient asked but does not know... etc.)

Pentabool, then? Or maybe you should just define an enumerated type for this specialised need. I don't think it's possible to define generally useful semantics for nulls, given the variety of uses they are put to. Ben.