Horusiath

import akka.persistence.AtLeastOnceDelivery.AtLeastOnceDeliverySnapshot
import akka.persistence.{SnapshotOffer, PersistentActor, AtLeastOnceDelivery}
import akka.actor.{Props, ActorSystem, ActorPath, Actor}

case class Message(data: String)
case class Confirmable(deliveryId: Long, data: String)
case class Confirmation(deliveryId: Long)
case class Snap(snapshot: AtLeastOnceDeliverySnapshot)

class ExampleAtLeastOnceDeliveryActor(val deliveryPath: ActorPath) extends PersistentActor with AtLeastOnceDelivery {

Horusiath

// class inheritance - C#
public abstract class Ancestor {}

public class Descendant: Ancestor, IDisposable 
{
    public void Dispose() {}
    public virtual void MyVirt() {}
}

// class inheritance - F#