I have: ```interface UseCase<in Request : Any, out Response: Any> { suspend fun execute(re...

# announcements

[dave08]

I have:

interface UseCase<in Request : Any, out Response: Any> {
    suspend fun execute(request: Request): Response

    suspend operator fun invoke(request: Request): Response = execute(request)
}

But when I call an implementation of it in a unit test, it throws:

usecase.SomeUseCase.invoke(Ljava/lang/Object;Lkotlin/coroutines/Continuation;)Ljava/lang/Object;
java.lang.AbstractMethodError: usecase.SomeUseCase.invoke(Ljava/lang/Object;Lkotlin/coroutines/Continuation;)Ljava/lang/Object;

what could this be?

[dave08]

The problem seemed to be when the invoke was a member function but when I extracted it out to:
suspend inline operator fun <reified Request : Any, reified Response : Any> UseCase<Request, Response>.invoke(request: Request): Response = execute(request) it worked... 🤔

[ephemient]

https://youtrack.jetbrains.com/issue/KT-42967

[dave08]

Funny, in my case it's a kotlin interface... but I guess you mean that it's compiled the same way... thanks, I'll track that issue.