Делегирование в Kotlin

interface Receiver {
    fun receiveMessage(): String
}
 
class Lupa : Receiver {
    override fun receiveMessage() = "Сообщение от Лупы!"
}
 
class Pupa(lupa: Receiver) : Receiver by lupa
 
fun main() = println(Pupa(Lupa()).receiveMessage()) // "Сообщение от Лупы!"

kotlinfun