```kotlin interface Greeter { fun greet() } cla...

# announcements

[Paul Woitaschek]

kotlin
interface Greeter {
  fun greet()
}

class HappyGreeter : Greeter {
  override fun greet() {
    println("hello :)")
  }
}

class SadGreeter : Greeter {
  override fun greet() {
    println("hello :(")
  }
}

class GreeterDelegate (val greeters : List<Greeter>): Greeter by greeters

[diesieben07]

How would this even work? What if greet returns something?

[marstran]

What would the greet function do in GreeterDelegate? Call greet on all elements of greeters?

[Paul Woitaschek]

@diesieben07 Right, didn't think of this.
My use case is that for analytics I have an interface with multilpe functions for tracking. Now I want to have multiple implementations of that interface for different providers (google analytics, firebase analytics for example)

[Paul Woitaschek]

Hm, this will do:

class GreeterDelegate(val greeters: List<Greeter>) {

  fun execute(action: Greeter.()->Unit) {
    greeters.forEach {
      action(it)
    }
  }
}

fun test(delegate: GreeterDelegate) {
  delegate.execute(Greeter::hello)
}

[kralli]

Btw how do paste a Snippet here? It only lets me paste it in the channel.

[karelpeeters]

https://superuser.com/a/1323804/580758