From: Albert Schlef <albertschlef@...>
Date: 2010-02-15T14:10:36+09:00
Subject: 'def', but with a closure

It occurred to me several times that I wanted to do:

  @cars.each do |owner, model|
    widget = TkLabel.new(:text => model)
    def widget.get_owner
      return owner
    end
  end

But, of course, this doesn't work because the code inside 'def' doesn't
see the enveloping variables, so the 'owner' within the 'def' isn't
recognized.

So instead I do:

  @cars.each do |owner, model|
    widget = TkLabel.new(:text => model)
    meta = (class << widget; self; end)
    meta.send(:define_method, :get_owner) do
      return owner
    end
  end

It work. Yet, it looks a bit ugly. Is there any "nicer" way I'm missing?
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