How to bind multiple interfaces to same singleton instance ?

Hi, I’m trying to use Kodein for building web application.

After using Kodein for a while, I noticed that I don’t know how to bind the same singleton instance to multiple interfaces.

Here is an example.

interface Foo {
  fun foo(): String
}

interface Bar {
  fun bar(): String
}

class Baz(
  private val dependency1: Dependency1,
  private val dependency2: Dependency2,
  private val dependency3: Dependency3
): Foo, Bar {

  ...

}

How can I bind the same singleton instance (baz) to both foo and bar in such a case?

Kodein {

  bind<Foo> with singleton { Baz(instance(), instance(), instance()) }
  bind<Bar> with singleton { Baz(instance(), instance(), instance()) } // <-- This will instantiate different instance !

}

I would be pleased if you could give me an advice. Thanks you for your awesome library !

[SalomonBrys]

Another trick would be to bind both instances with the same singleton binding:

val bazSingleton = singleton { Baz(instance(), instance(), instance()) }
bind<Foo> with bazSingleton
bind<Bar> with bazSingleton

This solution may be closer to what you are trying to achieve 😉

[rocketraman]

A nice readable syntax for this uses let as follows:

singleton { Baz(instance(), instance(), instance()) }.let {
  bind<Foo> with it
  bind<Bar> with it
}