Construction function using reified + when


#1

I’m trying out having a “factory” function like this. (The reason being that it’s used in generated code and the generator should stay simple).

inline fun <reified T: Any> get(str: String): T =
    when (T::class) {
        Uri::class -> Uri.parse(str) as T
        else -> throw IllegalStateException("don't know how to $str")
    }


val x = get<Uri>("www.example.com")

That works.

Now I also want to add Enums:

inline fun <reified T: Any> get(str: String): T =
    when (T::class) {
        Uri::class -> Uri.parse(str) as T
        Enum::class -> java.lang.Enum.valueOf(T::class.java, str)
        else -> throw IllegalStateException("don't know how to $str")
    }

This does not work:

Any hints on such a use-case?


#2

We’re planning to address this in a future version of Kotlin: https://github.com/Kotlin/KEEP/pull/37