From: "David A. Black" <dblack@...>
Date: 2003-12-16T22:51:28+09:00
Subject: Re: Copying methods from one class to another

On Tue, 16 Dec 2003, T. Onoma wrote:

> At first it seemed like it would be easy, since Ruby is so dynamic --if I add 
> a method to a class, every object previously defined as that class instantly 
> has it. But then I discoverd that the super keyword appear "prebound" to its 
> superclass. Take a look at:
> 
>   class C
>     def x
>       super
>     end
>   end
> 
>   class C < C;
>     @__aspect__ = true
>     def self.method_added(m)
>       meth = self.instance_method(m)
>       self.superclass.class_eval %Q{
>         remove_method(:#{m}) if method_defined?(:m)
>         define_method(:#{m}, meth)
>       }
>       remove_method(m)
>     end
>   end
>   c = C.new
>   c.x
> 
> I have satisfied the condition of the binding class being the same class type, 
> but nonetheless this code causes an infinite recursion on the super call.

When I ran it I got:

redef.rb:7: warning: already initialized constant C
redef.rb:3:in `x': super: no superclass method `x' (NoMethodError)
        from redef.rb:19


David

-- 
David A. Black
dblack@wobblini.net