Is it possible to have an expect/actual with diffe...

# multiplatform

[Kurt Renzo Acosta]

Is it possible to have an expect/actual with different types?

// Common
expect class MyClass {
    ...
    expect val myVal: MyCommonType
}

// Target 1
actual class MyClass {
    ...
    actual val myVal: MyTargetOneType
}

// Target 2
actual class MyClass {
    actual val myVal: MyTargetTwoType
}

Currently, I just add them but not as expect/actual variables but I can't use them in common

[russhwolf]

No, the declarations need to match exactly. You could do actual val myVal: MyCommonTime = MyTargetOneType() but you can only interact with it in common as MyCommonType

[Kurt Renzo Acosta]

I tried using typealias but the problem is on Android, it's an abstract class and on iOS, it's an interface.

[russhwolf]

Yeah you won't be able to typealias both at the same time

[ilya.gorbunov]

I think you can declare an expect type for MyCommonType and actualize it with type aliases to MyTargetOneType and MyTargetTwoType in those targets respectively.

[russhwolf]

How's that? Would need to be either expect class or expect interface. Can't be both at the same time

[russhwolf]

Unless you mean something different by "expect type" that I'm not aware of

[ilya.gorbunov]

but the problem is on Android, it's an abstract class and on iOS, it's an interface.

Yes, currently we have such a limitation, but also have a plan to lift it 🙂

[russhwolf]

Ah good to know. Looking forward to it!

[Luoqiaoyou]

// common
expect class Test
// jvm
actual typealias Test = JVMTest
// ios
actual typealias Test = IOSTest

[saket]

Finding this thread a bit late, but I had filed a feature request for this a while ago:

https://youtrack.jetbrains.com/issue/KT-33395