From: Laza <lazax.com@...>
Date: 2005-12-01T10:17:30+09:00
Subject: Re: If like smalltalk

You can define these methods in TrueClass and FalseClass so you don't
polute the Object class.

class TrueClass
    def if_true? ...; end
    def if_false?...; end
end

class FalseClass
   # the opposite...
end