From: "Ara.T.Howard" <ahoward@...>
Date: 2004-04-03T04:39:25+09:00
Subject: Re: parent of TrueClass, FalseClass

On Fri, 2 Apr 2004, Simon Strandgaard wrote:

> How about  (untested)
> 
> Then it would be easy to add a Maybe class ;-)
> 
> server> cat a.rb 
> module Boolean
>         class Base
>                 include Singleton
>         end
>         class True < Base
>                 def to_s; "true" end
>         end
>         class False < Base
>                 def to_s; "false" end
>         end
> end # module Boolean
> 
> TRUE  = Boolean::True.instance
> FALSE = Boolean::False.instance
> server>

the "don't care" (maybe) value is a valid value in boolean logic - it could
actually be useful...

-a
-- 
===============================================================================
| EMAIL   :: Ara [dot] T [dot] Howard [at] noaa [dot] gov
| PHONE   :: 303.497.6469
| ADDRESS :: E/GC2 325 Broadway, Boulder, CO 80305-3328
| URL     :: http://www.ngdc.noaa.gov/stp/
| TRY     :: for l in ruby perl;do $l -e "print \"\x3a\x2d\x29\x0a\"";done 
===============================================================================