is it expected that when i have a function with generics (e.g. `fun <T> doSomething(list: List...

# kotlin-native

[Michael Bryant]

is it expected that when i have a function with generics (e.g. fun <T> doSomething(list: List<T>): T), this function is left out of a generated dynamic library entirely?

[basher]

It might vary by platform. I think in Obj-C/Swift, you get a function that returns id/Any, but there's working being done to fix it for Obj-C/Swift: https://github.com/JetBrains/kotlin-native/pull/2850

[basher]

Of the interops, generics interop has the roughest edges so far

[Michael Bryant]

yeah. if i remove the generic and make it fun doSomething(list: List<Any>): Any it works just fine

[Michael Bryant]

but with generics it just leaves the function out entirely

[basher]

which platform?

[Michael Bryant]

mac osx

[basher]

oh a plain/global function?

[Michael Bryant]

yes

[basher]

For those, it should generate a class called <FileName>Kt

[basher]

and then it'll be a class/static member

[basher]

possible you found a bug though

[Michael Bryant]

yeah it seems like it should warn, at least

[Michael Bryant]

the generated native .kexe can use this function and works fine, it’s just missing from the dynamic library headers

[basher]

Interesting! Recommend filing an issue on jetbrains/kotlin-native

[Michael Bryant]

though i am using k/n 1.3.11. i’ll try to upgrade first and see if it fixes

[Michael Bryant]

no, this still happens on 1.3.30. filing an issue

[Michael Bryant]

https://github.com/JetBrains/kotlin-native/issues/2893

[kpgalligan]

I’m not sure if I’m doing anything different, but I get this in the header

[kpgalligan]

__attribute__((objc_subclassing_restricted))
__attribute__((swift_name(“FunctionsKt”)))
@interface MainFunctionsKt : KotlinBase
+ (id _Nullable)getItemFromListIndex:(int32_t)index list:(NSArray<id> *)list __attribute__((swift_name(“getItemFromList(indexlist)“)));
@end;

[kpgalligan]

Built with 1.3.30, that function comes from a file called “Functions.kt”

[kpgalligan]

To be clear, even with the generics support from the PR above, function generics don’t translate to Objc. However, I can get the function above to output, so this has to be some kind of config issue, or something weird (like maybe files named main.kt act differently, etc)

[kpgalligan]

I’m rereading this now. This is not for Objc, but for C, yes?

[kpgalligan]

With plain C, I don’t know why, but can confirm those functions are not output. For Objc, they are stripped of generics

[Michael Bryant]

yeah, this is just for C static/dynamic libraries

[Michael Bryant]

and i wouldn’t be surprised if they’re left out or mishandled, since generics are hard, but i think it should at least warn