adv_attr_accessor

# File actionmailer/lib/action_mailer/adv_attr_accessor.rb, line 3
    def adv_attr_accessor(*names)
      names.each do |name|
        ivar = "@#{name}"

        class_eval           def #{name}=(value)            #{ivar} = value          end          def #{name}(*args)            raise ArgumentError, "expected 0 or 1 parameters" unless args.length <= 1            if args.empty?              #{ivar} if instance_variable_names.include?(#{ivar.inspect})            else              #{ivar} = args.first            end          end, __FILE__, __LINE__ + 1

        self.protected_instance_variables << ivar if self.respond_to?(:protected_instance_variables)
      end
    end