From: "T. Onoma" <transami@...>
Date: 2003-12-16T23:46:55+09:00
Subject: Re: Copying methods from one class to another

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

-- 
T.