Hello folks. I have the following expect function `expect fun String.formatPlatform(vararg args: Any...

# multiplatform

[Francis Mariano]

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.

[louiscad]

You at least miss the spread operator (*).

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

[Francis Mariano]

@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()
}

[louiscad]

Same issue when using stringWithFormat?

[Francis Mariano]

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

[Francis Mariano]

@louiscad Look this https://youtrack.jetbrains.com/issue/KT-42925

[louiscad]

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

[Francis Mariano]

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