Reified functions.md

Reified functions

The reified function crashes at runtime.

Explanations

Let's describe the reified function in Kotlin:

//ReifiedFunctions.kt

inline fun<reified T> reifiedExample(marks: Int): T {
    return when (T::class) {
        Int::class -> marks as T
        String::class -> "Congratulations! you scored more than 90%" as T
        else -> "Please enter valid type" as T
    }
}

We are trying to call from Swift:

let c = ReifiedFunctionsKt.reifiedFunction(marks: 23)
print("c = \(String(describing: c))")

When calling this code, the application crashes with an error:

Function doesn't have or inherit @Throws annotation and thus exception isn't propagated from Kotlin to Objective-C/Swift as NSError.
It is considered unexpected and unhandled instead. Program will be terminated.
Uncaught Kotlin exception: kotlin.IllegalStateException: unsupported call of reified inlined function `com.jetbrains.swiftinteropplayground.generics.reifiedFunction`

We add an annotation on the Kotlin side @Throws(IllegalStateException) and get another error:

My error messasge 
Error Domain=KotlinException Code=0 "unsupported call of reified inlined function `com.jetbrains.swiftinteropplayground.generics.reifiedFunction`" 
UserInfo={NSLocalizedDescription=unsupported call of reified inlined function `com.jetbrains.swiftinteropplayground.generics.reifiedFunction`, 
KotlinException=kotlin.IllegalStateException: unsupported call of reified inlined function `com.jetbrains.swiftinteropplayground.generics.reifiedFunction`, 
KotlinExceptionOrigin=}

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