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copied!<p>For instance methods there is an <code>Object::method_added(name)</code> method you can override, similar to 'inherited' you have used:</p> <pre><code>class test def self.method_added(name) puts "method_added(#{name.inspect})" super end end irb(main):002:0> class Child < Test; def foo; end; end method_added(:foo) => nil </code></pre> <p>You can then compare a received name to a list of your methods:</p> <pre><code>Test.instance_methods.include?(name.to_s) </code></pre> <p>With class methods this approach does not work (even if you do things like <code>class << self</code> magic), but a helpful fellow knew the answer: <a href="http://www.ruby-forum.com/topic/120416" rel="nofollow">http://www.ruby-forum.com/topic/120416</a> :</p> <pre><code>class Test def self.singleton_method_added(name) puts "Class method added #{name.inspect}" end end </code></pre> <p>This is only the first part of the problem, because you need to know which class defined the method (it will be self) and whether the method is a new one, or overridden one. Experiment with this code:</p> <pre><code>class Test def self.singleton_method_added(name) if self == Test puts "My own class method added: #{self.name}.#{name.inspect}" elsif Test.methods(false).include?(name.to_s) puts "Class method overriden: #{self.name}.#{name.inspect}" elsif Test.methods(true).include?(name.to_s) puts "My parent's class method overriden: #{self.name}.#{name.inspect}" else puts "New class method added: #{self.name}.#{name.inspect}" end end end </code></pre>

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