Re: [Boost-users] tribool question

From: Serge Skorokhodov (serge.skorokhodov_at_[hidden])
Date: 2005-08-08 08:57:47

Hi,
> 
>> 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.
> 

Sure you're right! I use just an enum. But tribool with
'being_null' initial state was very convinient though;)

-- 
Serge