I’m working with a third-party library that has a function which expects an argument of type KProperty1<T, V>, and casts it to an instance of CallableReference internally. I need to acquire a reference to a class member through reflection that is an instance of both KProperty1 and CallableReference.

The function in the third-party library looks something like this:

fun <T : Any, V> thirdPartyFunction(property: KProperty1<T, V>)  {
    val callableReference = (property as CallableReference)
}

Everything works when I call the function with a member reference obtained with the :: operator:

class ExampleClass(
    var exampleProperty: String,
)

// this works
thirdPartyFunction(ExampleClass::exampleProperty)

When I call the function with a value obtained through reflection, I get a ClassCastException:

val reflectedProperty = ExampleClass::class.memberProperties
    .find { it.name == "exampleProperty" } as KProperty1<ExampleClass, String>

// class kotlin.reflect.jvm.internal.KMutableProperty1Impl cannot be cast to class kotlin.jvm.internal.CallableReference
thirdPartyFunction(reflectedProperty)