I ran into real weirdnesses with an combined apple source set for watchos and ios because the NSInteger is a long on ios and an int on watchos. This made me write really strange code like this:

internal fun NSInteger.toInt(): Int {
  return asInt()
}

private fun Any.asInt(): Int {
  return when (this) {
    is Long -> this.toInt()
    is Int -> this
    else -> error("Could not convert $this to Int")
  }
}

Is there a better way to do that? I’m kind of looking for the opposite of cinterop.convert.

I starred that some time ago that looks like it's what you're looking for ? https://youtrack.jetbrains.com/issue/KT-41509

I think

convert()

would still work in this case. But I might be missing something. There are edge cases where it's not what you want.

That issue is definately describing my problem. Convert doesnt help as it's only defined on the kotlin types

Ah yeah I see. One workaround then is to leave your public Kotlin APIs in terms of

NSInteger

so you can do whatever conversion you need (

convert()

, or some `expect`/`actual` that differs between 32-bit and 64-big sources) on the Kotlin side.