gistfile1.rb

  ### meta magic boolean attributes
  def self.attr_boolean(attr_name)
    class_eval(<<-CODE, __FILE__, __LINE__)
      def #{attr_name}=(#{attr_name})
        @#{attr_name} = !!(/^1|true$/i =~ #{attr_name}) # yes, we need a boolean
      end

      def #{attr_name}
        @#{attr_name}
      end
      alias_method :#{attr_name}?, :#{attr_name}
    CODE
  end

  attr_boolean :is_awesome
  attr_boolean :has_mutant_powers