Why is it not possible to declare a typealias to C...

# kotlin-native

[Paul Idstein]

Why is it not possible to declare a typealias to CPointer<T> for expect declaration? e.g.

expect class Image

actual typealias Image = platform.CoreVideo.CVPixelBufferRef // iOS -  'declaration is incompatible because number of type parameters is different'

[Dominaezzz]

That's very unlikely to be compatible.

[Dominaezzz]

What other `actual`s do you have for that expect.

[Paul Idstein]

I have a common part and an actual iOS and Android part
actual for Android looks like this:

actual typealias Image = Bitmap

[Sam]

CVPixelBufRef is very low level. You probably want to work with a higher level abstraction like CgImage or UIImage.

[Paul Idstein]

I can not and do not want to in our case we try to wrap ARFrame’s capturedImage

[russhwolf]

From the error it looks like it’s because CPointer<T> has a generic argument and your expect declaration and other `actual`s don’t. An actual typealias is extremely strict about how closely it must match the expect. It’s often more flexible to use a wrapper class instead.