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

# multiplatform

[Olenyov Kirill]

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?

[Artyom Degtyarev [JB]]

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

[Olenyov Kirill]

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

[Artyom Degtyarev [JB]]

No, this behaviour is expected.

[Olenyov Kirill]

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

[Artyom Degtyarev [JB]]

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.

[Olenyov Kirill]

Thanks! Now it’s clear!