example of overriding a method in class via mixin

gistfile1.txt

class C
  def initialize(*args)
    puts "hi from C"
  end
end

module M
 def self.included(clazz)
   clazz.class_eval do
     alias_method :old_initialize, :initialize
     def initialize(*args)
       puts "hi from M"
       old_initialize
     end
   end
 end
end

class C
  include M
end

C.new