Kotlin declaration clash

Question

I have a question. Is there any there any other way to fix this code than adding @JvmName?

class Test() { fun <T> apply(calc: (String, List<Double>, Double, Double) -> T): T { return calc("a", listOf(), 1.2, 3.4) } fun <T> apply(calc: (String, Double, Double, Double) -> T): T { return calc("a", 1.2, 3.4, 5.6) } }

The above code makes the following error:

Error:(375, 9) Kotlin: Platform declaration clash: The following declarations have the same JVM signature (apply(Lkotlin/jvm/functions/Function4;)Ljava/lang/Object;): fun <T> apply(calc: (String, Double, Double, Double) -> T): T defined in Sample.Test fun <T> apply(calc: (String, List<Double>, Double, Double) -> T): T defined in Sample.Test

Szymon Lipiński · Accepted Answer · 2018-02-27 12:56:16Z

It looks like there is no way, as the generic code generated by Kotlin uses the Function4 as the argument type. It is an interface of 4 generic arguments, so regardless the types, all look the same.

/** A function that takes 4 arguments. */ public interface Function4<in P1, in P2, in P3, in P4, out R> : Function<R> { /** Invokes the function with the specified arguments. */ public operator fun invoke(p1: P1, p2: P2, p3: P3, p4: P4): R }

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