Hello folks. I have the following expect function

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

and on iosMain module I wrote the actual function

actual fun String.formatPlatform(vararg args: Any?): String {
    return NSString.create(format = this, args = arrayOf(args)).toString()
}

But when I compile that code I get this error :

kotlin.Array<out kotlin.Any?>  is not supported here: doesn't correspond to any C type

I tried to change the parameter type from expect function to Float or Double, but the error continues:

kotlin.Array<out kotlin.Float?>  is not supported here: doesn't correspond to any C type

I read the issue https://github.com/JetBrains/kotlin-native/issues/1834 but I do not solve the problem. Can anyone help me with that? Thank you.

You at least miss the spread operator (

*

). Look at this comment in the issue: https://github.com/JetBrains/kotlin-native/issues/1834#issuecomment-484854268

@louiscad I think so not When I add the spread operator the Android Studio show me a warning :

Redundant spread (*) operator

and the error is the same.

actual fun String.formatPlatform(vararg args: Any?): String {
    return NSString.create(format = this, args = *arrayOf(args)).toString()
}

Same issue when using

stringWithFormat

?

Yes.

actual fun String.formatPlatform(vararg args: Any?): String {
    return NSString.stringWithFormat(format = this, args = arrayOf(args))
}

type kotlin.Array<out kotlin.Any?> is not supported here: doesn't correspond to any C type

Looks like what you want is impossible, so you'll need to hardcode every time for iOS until there's a better solution.

yeah, I am watching that issue in youtrack. Thank you