Hi, I hava another issue now with generics and obj-c. In kotlin I have a simple class with Int types:

data class MyTestDataClass(val ppp: Int, val ttt: List<Int>)

But in obj-c it looks like: CommonMyTestDataClass : KotlinBase - (instancetype)initWithPpp:(int32_t)ppp ttt:(NSArray<CommonInt *> *)ttt So different types: int32_t and CommonInt WTF?

Hello! What’s wrong with it? You should be available to work with both these types from the Objective-C side, AFAIK.

Actually, I don’t know:) My iOS team said that these types are different and may be it’s a bug Kotlin<->ObjC mapping..

No, this behaviour is expected.

Ok, thanks. Can I read somewhere about this behavior? I would like more about this..

As you can see in this table(https://kotlinlang.org/docs/reference/native/objc_interop.html#mappings), Kotlin primitive types are mapped into either primitive types or

NSNumber

. Also, there is a note on boxes mapping, explaining your case. As a

List

in your example should be exported

NSArray

, it has to use

NSNumber

subclass. In Objective-C, one cannot make NSArray of primitive types.

Thanks! Now it’s clear!