From: Brian Candler <B.Candler@...>
Date: 2003-07-15T23:56:20+09:00
Subject: Re: Custom method_missing doesn't trap super call

On Tue, Jul 15, 2003 at 11:48:48PM +0900, Brian Candler wrote:
> But you can now forget about class hierarchies, and deal with delegation
> hierarchies instead.
> 
> I find it's simplest and most powerful to explicitly keep track of objects
> you want to delegate to. Here's a trivial example:

P.S. I forgot the issue about 'super' which had been raised before, but when
you do explicit delegation the problem vanishes:

class Foo     # the 'superclass'
  def meth1
    puts "meth1 in #{self.class}"
  end
end

class Bar     # the 'child' class
  def initialize
    @sup = Foo.new
  end
  def meth1
    puts "meth1 in #{self.class}"
    @sup.meth1                      # <-----
  end
end  
     
c = Bar.new
c.meth1

#>>meth1 in Bar
#>>meth1 in Foo

Of course you're not limited to one 'parent' object; you can decide to pass
to one or more objects which you hold a reference to.

Regards,

Brian.