RDecorator

gem 'rdecorator'

class Language
  extend Rdecorator

  def best(this, args)
    'best Language' + this.call(args)	
  end

  wrap :best
  def ruby
    'ruby'	
  end
end

Language.new.ruby #=> best Language ruby

class Decorator 

  include Rdecorator

  def call
    'say fucking' + @this.call(*@args)
  end
end

class DummyClass

  decorator Decorator
  def say(hello)
    'hello'	
  end

end