Lambda implementation of interface in kotlin

Question

What would be the equivalent of that code in kotlin, nothing seems to work of what I try:

public interface AnInterface {     void doSmth(MyClass inst, int num); } 

init:

AnInterface impl = (inst, num) -> {     //... } 

Answer 1

If AnInterface is Java, you can work with SAM conversion:

val impl = AnInterface { inst, num ->       //... } 

Otherwise, if the interface is Kotlin...

interface AnInterface {      fun doSmth(inst: MyClass, num: Int) } 

...you can use the object syntax for implementing it anonymously:

val impl = object : AnInterface {     override fun doSmth(inst:, num: Int) {         //...     } } 

Answer 2

If you're rewriting both the interface and its implementations to Kotlin, then you should just delete the interface and use a functional type:

val impl: (MyClass, Int) -> Unit = { inst, num -> ... }