You cannot create class that inherits from a function

# coroutines

[Francisco Javier Ruiz Rodriguez]

You cannot create class that inherits from a function

[marstran]

You can. It's just inheritance from a suspending function type that is not allowed. This compiles fine:

class Test(val n: Int) : () -> Int {
   override fun invoke(): Int = n
}

[Marcin Bak]

suspending function has a different bytecode signature to what you declare in your suspend fun, hence not allowed

[Francisco Javier Ruiz Rodriguez]

Well, I agree, but I must say you are inheriting from a kotlin interface (kotlin.Function)

[Dico]

You can inherit from kotlin.Function, use Any? as return type and add Continuation<R> parameter

[trathschlag]

I think this is planned for 1.40

[kevin.cianfarini]

while you might be able to do this, and it will probably work....from a developer perspective it would be much easier to make it a single method interface

[Zach Klippenstein (he/him) [MOD]]

Also, I’m pretty sure “inheriting from a function type” is not supported in Kotlin/JS, so this will make your code multiplatform-unfriendly.