Finalization in Ruby

finalize.rb

def Object.finalize_with(*ivars_names, &block)
  old_init = instance_method(:initialize)

  define_method :initialize do |*args|
    puts "MyBlock: #{block}"
    old_init.bind(self).call(*args)
    ivars = ivars_names.map { |ivar| instance_variable_get(ivar) }
    ObjectSpace.define_finalizer(self, proc { block.call(*ivars) })
  end
end

class MyFoo
  def initialize(count)
    @shout_t = count
  end

  finalize_with :@shout_t do |shout_t|
    puts shout_t
  end
end