From: Andrea Fazzi <andrea.fazzi@...>
Date: 2006-11-29T17:49:01+09:00
Subject: open classes, constructors and blocks

Hi all,

I'd like to re-open a class and to re-initialize its original constructor:

class Foo
 def initialize
   yield self if block_given?
 end
end

class Foo
 attr_reader :var
 alias foo_initialize initialize
 def initialize
   foo_initialize
   @var = "Foo's instance var"
 end
end

Foo.new { |foo| puts foo.var }

The problem is that the block passed to the new constructor is never 
called! Why?
Which is the best way to redefine a constructor when a class is re-opened?

Thanks!
Andrea