From: Evan Senter <evansenter@...>
Date: 2009-11-24T09:05:35+09:00
Subject: Re: How to alias_method_chain initialize from a mixin.

I explored your idea of using inheritance a bit further, and though it's 
not entirely transparent to the consuming class (super has to be called) 
it is a clean implementation, and would look something like this:

class A
  def initialize(&block)
    @_original_self = block.binding.eval("self")
    instance_eval(&block) if block_given?
    remove_instance_variable :@_original_self
    finish_init if defined? :finish_init
  end

  def print_me_a
    p "print_me_a"
  end

  def method_missing(name, *args, &block)
    @_original_self ? @_original_self.send(name, *args, &block) : super
  end
end

class B < A
  def initialize
    super
  end

  def finish_init
    p "finish_init"
  end

  def print_me_b
    p "print_me_b"
  end
end

class C
  def self.run
    B.new do
      print_me_a
      print_me_b
      print_me_c
    end
  end

  def self.print_me_c
    p "print_me_c"
  end
end

b = C.run

#=> "print_me_a"
#=> "print_me_b"
#=> "print_me_c"
#=> "finish_init"

Thanks for the input, it was helpful!
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