From: Robert Feldt <feldt@...>
Date: 2001-11-12T07:25:52+09:00
Subject: [ruby-talk:24896] Re: Help needed on subclassing

On Sun, 11 Nov 2001, Niklas Frykholm wrote:

> What about this?
> 
>     class T
>       def initialize(a,b,c)
>         puts "T #{a} #{b} #{c}"
>       end
>     end
> 
>     class M
>       def [](x)
>         s = Class.new(T)
>         class << s
>           def new(c)
>             T.new(1,2,c)
>           end
>         end
>         return s
>       end
>     end
> 
> Or if you don't need S to be a real class, you could do:
> 
>     class T
>       def initialize(a,b,c)
>         puts "T #{a} #{b} #{c}"
>       end
>     end
> 
>     class SMeta
>       def initialize(am, bm)
>         @am, @bm = am, bm
>       end
> 
>       def new(c)
>         T.new(@am, @bm, c)
>       end
>     end
> 
>     class M
>       def [](x)
>         SMeta.new(1,2)
>       end
>     end
> 
Yes, these are two good solutions to my problem. Thanks; when the brain
gets cloudy and you can't see the light its good to have a community to
lean on. (And its amazing how "cloudy" things can get when doing a Ruby
all-nighter! :-) Seems almost like the brain gradually degrades and
narrows in on some basic, low-level functions. What happened to those
40-hour weeks XP promised!? I'm trying to use XP and test-first design as
much as possible. Can the problem be that I'm not a pair? :-) )

Regards,

/Robert