From: "David A. Black" <dblack@...>
Date: 2003-12-17T03:32:57+09:00
Subject: Re: Copying methods from one class to another

Hi --

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

> On Tuesday 16 December 2003 02:51 pm, David A. Black wrote:
> > 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
> >
> 
> Thanks David, I forgot the most important part! Here, this one makes it even 
> more plain:
> 
> class C
>   # don't even need the def here
> 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)
>     }
>     self.remove_method(m)
>   end
> end
> 
> class C  # this is what I forgot: to add a method
>   def x
>     print "<"; super
>   end
> end
> 
> c = C.new
> c.x

That code gives me:

redef.rb:5: warning: already initialized constant C
redef.rb:13:in `method_added': private method `remove_method' called
for C:Class (NoMethodError)
        from redef.rb:18


David

-- 
David A. Black
dblack@wobblini.net