class Delayed2
  def initialize(&b)
    @b=b
  end
  def to_s
    return @b.call
  end
end

#Example usage:
#i=45
#c=mtk_delay { i + 5 }
#i=35
#puts  c.to_s
def mtk_delay (&block)
  return Delayed2.new(&block)
end