Can I expect a top-level class while still impleme...

# multiplatform

[mbonnin]

Can I expect a top-level class while still implementing nested classes?

// MyClass is platform-specific
expect class MyClass(
  param1: Param1,
  param2: Param2,
  param3: Param3
) {
  // Builder is the same for all platforms
  class Builder {
     var param1: Param1? = null
     // ...

     fun build(): MyClass {
       return MyClass(
                param1 = param1 ?: defaultParam1,
                // ...
              )
     }
  }
}

[russhwolf]

I don't think so. You might be able to mimic the same caller syntax by making MyClass an interface and doing a expect fun MyClass(...): MyClass that returns platform-specific implementations.

[mbonnin]

Thanks !

[mbonnin]

That's not exactly the same as Builders but given that my example had only 2 parameters, that'll work nicely 🙂

[russhwolf]

you could still have a Builder inside the interface

[mbonnin]

👍 Yup, that'll work

[russhwolf]

cool I won't try to type it out in Slack then 😄

[russhwolf]

(if you dropped the builder you wouldn't need the workaround and could just go back to an expect class)

[mbonnin]

We have Builders everywhere now 😅 so it's more consistent to leave it there too

[mbonnin]

Wait actually no, in this specific case, since it's 2 parameters only the Factory function should be good 👍

[mbonnin]

But maybe in the future we might need Builders for multiplatform classes