code: def powerupIndirector(interface):
      
      def decorator(cls):
          zi.implementer(iaxiom.IPowerupIndirector)(cls)
          cls.powerupInterfaces = [interface]
          cls.indirect = _indirect
          return cls
  
      return decorator
docs: A decorator for a powerup indirector from a single interface to a single
      in-memory implementation.
  
      The in-memory implementation that is being indirected to must be created
      in the ``activate`` callback, and then assigned to ``self.indirected``,
      which is an ``inmemory`` attribute.