Kotlin call function only if all arguments are not null

Question

Is there a way in kotlin to prevent function call if all (or some) arguments are null? For example Having function:

fun test(a: Int, b: Int) { /* function bo         


        

Answer 1

If you try assigning null to any of the two Int variables you will find that this doesn`t work. See the compile errors in the comments.

fun test(a: Int, b: Int) { /* function body here */ }

fun main(){
    test(null, 0) //Null can not be value of non-null type Int
    val b : Int? = null
    test(0, b) // Type mismatch. Required: Int - Found: Int?
}

The example shows that in a pure Kotlin world test(a: Int, b: Int) cannot be called with null or even Int? arguments. If you put Java in the mix I doubt there is a safe solution without null checks, because you can call test(Int, Int) with type Integer from the Java side, which allows null. The Java "equivalent" to Int would be @NotNull Integer (which is not really null-safe).