From: Keith Rarick <kr@...>
Date: 2007-08-03T15:29:06+09:00
Subject: method_added hook and class methods

Hello all, I am puzzled at some behavior I recently observed in ruby. I
searched the archives and google and didn't see an answer, so I am
asking here:

First I want to observe when instance methods are defined in a class, so
I do this:

class C
  class << self
    def method_added(name)
      puts 'added ' + name.to_s
    end
  end

  def an_instance_method
  end
end

As I expect, this program prints "added an_instance_method".

Now I want to observe when class methods are defined. My understanding
of ruby says that "class methods" are really just instance methods of
the metaclass. So I do this:

class C
  class << self
    class << self
      def method_added(name)
        puts 'added ' + name.to_s
      end
    end

    def a_class_method
    end
  end
end

I expect this program to print "added a_class_method", but it produces
no output.

Am I misunderstanding something or is this a bug?

Is there some other way to observe when class methods are defined?

Any help would be very much appreciated.

kr
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