From: 7stud -- <bbxx789_05ss@...>
Date: 2009-07-20T15:52:38+09:00
Subject: Re: Ruby Object listener?

class MyHash < Hash
  def [](key)
    notify
    super
  end

  def []=(key, val)
    notify
    super
  end

  def notify
    puts "something happened"
  end

end

h = MyHash["a", 10, "b", 20]

h["c"] = 30
val = h["c"]

--output:--
something happened
something happened
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