Did anyone figure out how to use an expect/actual ...

# kotlin-native

[Thomas]

Did anyone figure out how to use an expect/actual for java.lang.String.format and NSString.create(format, args)? The NSString requires you to use *arrayOf(…) for args. For example let’s say this is the expect function:

expect fun String.format(vararg args: Any?): String

How would you able to make an actual fun using NSString.create?

[Thomas]

related comment on issue: https://github.com/JetBrains/kotlin-native/issues/1834#issuecomment-484854268

[svyatoslav.scherbina]

How would you able to make an actual fun using NSString.create?

Due to restrictions of C/Objective-C varargs you can’t pass values received through Kotlin variadic parameters to Objective-C variadic method.

[Thomas]

Thanks, that’s what I was afraid of. I guess I will need to avoid vararg for this, and use multiple functions for different type of arguments

[Thomas]

I hoped something like an inline expect/actual function would work for this. So the varargs are inlined into the C method call

[svyatoslav.scherbina]

I guess I will need to avoid vararg for this, and use multiple functions for different type of arguments

This is probably the only solution for now.

[Thomas]

@svyatoslav.scherbina That is what I have now done, and works fine for me. Thanks for your help.