Hello everyone, after implementing

scala.Function1

i recognized that Kotlin has problems with overriding traits. If you use it as functional interface, you get a

Kotlin: Interface Function1 does not have constructors

error:

ScalaFunction1<Any, String> {
    ('A'.toInt()+(it as Int)).toChar().toString()
}

If you implement it as anonymous object you get the error

Kotlin: Object is not abstract and does not implement abstract member public abstract fun <A : Any!> compose(p0: Function1<A!, Any!>!): Function1<A!, String!>! defined in scala.Function1

:

private fun tabulateIntToStringFunc() = object : ScalaFunction1<Any, String> {
    override fun apply(v1: Any?): String {
        return ('A'.toInt()+(v1 as Int)).toChar().toString()
    }
}

If you implement

andThen

and

compose

you get the error `Kotlin: Object is not abstract and does not implement abstract member public abstract fun `apply$mcZD$sp`(p0: Double): Boolean defined in scala.Function1` :

private fun tabulateIntToStringFunc() = object : ScalaFunction1<Any, String> {
    override fun apply(v1: Any?): String {
        return ('A'.toInt()+(v1 as Int)).toChar().toString()
    }

    override fun <A : Any?> andThen(g: scala.Function1<String, A>?): scala.Function1<Any, A> {
        throw NotImplementedError()
    }

    override fun <A : Any?> compose(g: scala.Function1<A, Any>?): scala.Function1<A, String> {
        throw NotImplementedError()
    }
}

But it is not possible to override this abstract function. Can someone explain to me what is happening there? I'm new to this Scala-Kotlin business, i think this lack of knowledge is my core-problem here. Furthermore i don't know the inner working mechanisms of Scala and its java-interop, which adds even more challenges for me. ^^'

Oh I'm so sorry I've missed this thread! Coud you please provide me with info on why do you need this?