Kotlin-native: Suspendable functions not visible in iOS framework

[Marcopohlo]

Hello,

I have a specific problem with suspendable functions in Kotlin/Native.

So for example function like this will only generate

interface CommandHandler<in T : Command> {

    suspend fun handle(command: T)
}

will only generate

@protocol PrefixCommandHandler
@required
@end;

Any way how to fix it?

[olonho]

How do you want it to be exposed in Objective-C? Currently, there's no way to have coroutines in Objective-C or Swift, so exposing suspend functions look tricky.

[Marcopohlo]

@olonho I've been reading more into coroutines and I see why it doesn't work in objc, thank you.

[Thomas-Vos]

How do you want it to be exposed in Objective-C? Currently, there's no way to have coroutines in Objective-C or Swift, so exposing suspend functions look tricky.

@olonho What about exposing it just like in Java? For example this code:

interface MyInterface {

   suspend fun getResult(param: String): Boolean
}

would be exposed in Objective-C like the following Kotlin code:

interface MyInterface {

   fun getResult(param: String, cont: Continuation<Boolean>)
}

Maybe this can be enabled with an optional compiler flag or something similar?

[SvyatoslavScherbina]

In Kotlin 1.4 (starting from M2) suspend functions will be available from Swift/Objective-C as functions with completionHandler: callback.