Is it possible to use generic types in iOS app ret...
# kotlin-nativer
rudolf.hladik
09/10/2018, 2:06 PMIs it possible to use generic types in iOS app returned from Common module function?
s
Sam
09/10/2018, 2:16 PMThey can be used but they’re type erased.
r
rudolf.hladik
09/10/2018, 2:24 PMI can’t imagine what you mean
rudolf.hladik
09/10/2018, 2:48 PM@Sam is something like this possible ?
Copy code
// common module
sealed class Option<out T>
data class Some<T>(val value: T): Option<T>()
object None : Option<Nothing>()
fun <T> T?.toOption(): Option<T> = this?.let { Some(it) } ?: None
fun getOption(): Option<String> {
return "OK".toOption()
}
// iOS app
func get() {
let stringValue = getOption()
if let stringValue as? Some { stringValue.value }
else { print("value not present") }
}s
Sam
09/10/2018, 2:58 PMAll of your T’s will become Object when going from Kotlin to Obj-C. Currently Obj-C supports generics but in a very limited fashion. Only the collection types can be parameterized and it works like Java where it is only a compile time check.
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