How can I inject the same object via different interfaces?

Question

Using Robotlegs 2.0, is it possible to declare a singleton in a context and inject it in multiple classes, where each injection is requesting a different interface?

The class to inject:

 class MyClass implements IFoo, IBar {}

Injection site 1:

 class NeedFoo {
    [Inject]
    public var foo:IFoo;
 } 

Injection site 2:

 class NeedBar {
    [Inject]
    public var bar:IBar;
 } 

I want both injections to be for the same instance, but if I create two mappings, then each gets its own instance:

 injector.map( IFoo ).toSingleton( MyClass );
 injector.map( IBar ).toSingleton( MyClass );

So I ended up doing this:

 var instance:MyClass = new MyClass();
 injector.map( IFoo ).toValue( instance );
 injector.map( IBar ).toValue( instance );

Is there a way to just say that this object should be provided for any interface that it implements, rather than individually for each one?

Answer 1

Yes, it is, but it's a bit convoluted and really unclear ATM. We're going to provide some syntactic sugar for it in the future, but for the moment you can do this:

injector.map( IFoo ).toSingleton( MyClass );
var provider: DependencyProvider = injector.getMapping( IFoo ).getProvider();
injector.map( IBar ).toProvider( provider );

or

var provider: DependencyProvider = injector.map( IFoo ).toSingleton( MyClass ).getProvider();
injector.map( IBar ).toProvider( provider );