Re: [boost] 3-state boolean type

From: Beman Dawes (bdawes_at_[hidden])
Date: 2002-08-01 17:20:17

At 12:37 PM 8/1/2002, Douglas Gregor wrote:

 >I've just placed a 3-state boolean type in the sandbox, ...

I almost suggested the same thing a few months ago, under the name 
fuzzy_bool, because I needed it in an application.

But it turned out the only thing fuzzy was my application design, and I 
lost interest in fuzzy_bool once the application design moved on.

In fact that has been my experience with three-state logic every time I've 
run into it.  Either the application turns out to be trivial to do with 
regular two-state logic, or seriously vague logic is needed and the app 
moves to a weighed logic scheme.  But maybe if it were a component sitting 
in a library, more uses would be found.

A historical note - circa 1968 - Computer Design magazine ran a series of 
articles on three-state hardware logic.

Knuth called the three states flip-flop-flap, IIRC:-)

--Beman