From: Dave Thomas <Dave@...>
Date: 2001-08-16T22:46:34+09:00
Subject: [ruby-talk:19897] Re: Why not?: Assigning to self

"Pit Capitain" <pit@capitain.de> writes:

> class Rectangle
>   def set_size( width, height )
>     if width == height
>       become Square.new( width )
>     else
>       @width, @height = width, height
>     end
>   end
> end
> 
> class Square < Rectangle
>   def set_size( width, height )
>     if width == height
>       super
>     else
>       become Rectangle.new( width, height )
>     end
>   end
> end
> 
> This implementation meets the (at least my) intuition.

I still don't see this. There's no difference between your two classes
except they sometimes become one another. Why not

  class Rectangle
    def set_size(width, height)
      @width, @height = width, height
    end

    def is_square?
      @width == @height
    end
  end


What does all this class morphing get you?


Dave