From: Paul Brannan <pbrannan@...>
Date: 2001-11-27T03:48:05+09:00
Subject: [ruby-talk:26536] Re: delegates and weakref

On Tue, 27 Nov 2001, Yukihiro Matsumoto wrote:

> It's the limitation.  WeakRef is not a "cooked" class, i.e. it doesn't
> complete without specifying target in the "initialize". So,

I'm not sure I understand what you mean by "cooked."  I am calling
WeakRef.new, which should call initialize, right?

Looking at the WeakRef source, I can see that WeakRef is a Delegator.  So
I thought I'd try the same exercise, trying to delegate to a delegate:

  require 'delegate'

  class Foo
    def method_missing(*args)
      p args
    end
  end

  class Bar < DelegateClass(Foo)
    def initialize
      super(Foo.new)
    end
  end

  class ABC < DelegateClass(Bar)
    def initialize
      super(Bar.new)
    end
  end

  b = ABC.new # BTW, is there a better name for a class when Foo and Bar
              # are already taken?
  b.foo

With this I get the same error:

  mm.rb:22: undefined method `foo' for #<ABC:0x402828c0> (NameError)

Is this a fixable problem or is it really a fundamental limitation?

Paul