From: Massimiliano Mirra <list@...>
Date: 2002-10-28T06:56:51+09:00
Subject: Re: How come true, false don't support <=> (comparison) operator?

On Sun, Oct 27, 2002 at 10:07:31AM +0900, Phil Tomson wrote:
[snip explanation... still don't see how it implies ordering, sorry :-(]

> Anyway, I guess I'm in the camp that would like to see some kind of 
> hierarchy like:
> 
> class Boolean
> ....
> end
> 
> class TrueClass < Boolean
> ....
> end
> 
> class FalseClass < Boolean
> ....
> end
> 
> Then there would be some kind of type relationship between TrueClass and 
> FalseClass.  That would just seem to make more sense to me, but I do see 
> the potential pitfalls with that approach too.

I'm wondering what happens when subclassing Boolean a third time.

What would the relationship be among this third class and FalseClass
and TrueClass?  And what relationship among its instance (or rather
its singleton) and `true' and `false'?

Does a class model actually make sense here?


Massimiliano