AS3: How do I set a method argument to implement multiple interfaces?

The argument to my func () method must implement two unrelated interfaces IFoo and IBar. Is there a better way to do this than to declare another interface just for this purpose that inherits from IFoo and IBar and uses that interface as the argument type?

public interface IFooBar extends IFoo, IBar {
}

public function func(arg:IFooBar):void {
}

      

        
        
        
      

    

I am developing Flash Player 9.

Features of what I am trying to do:

I am writing a small library of classes to help me develop Flash games. To aid in debugging and verifying game results, the library requires the user to break the game into the following components:

• rawInputProducer: generates device input events from any flash input events, saved events from a previous session or other source
• rawInputProcessor: listens for device input and creates custom commands from it
• gameController: listens for custom commands and updates game state.
• gameView: listens for game state changes with gameController and updates the scene

All of these components generate events (called "messages" so as not to be confused with flashes). The class Engine

initiates the components and starts the main loop.

In order for the components to be as versatile as possible, it Engine

only requires that they implement IMessageDispatcher

and ITickable

. I want to write classes that are only IMessageDispatcher

or only ITickable

. I also have a generic MessageDispatcher

one that implements IMessageDispatcher

that my components are likely to expand.

The original question is about how can I declare a method like this:

Engine.setGameController(controller: ITickable & IMessageDispatcher):void