Mastering High Performance with Kotlin

Delegate object with generic

If you're going to use a delegate object for delegating objects of different types, you should create a separate class for each primitive type. You can create a single delegate class with a generic like this:

class GenericDelegate<T> : ReadOnlyProperty<Any?, T?> {    override fun getValue(thisRef: Any?, property: KProperty<*>): T? {        TODO()    }}

And use it as follows:

class Main {    val property by GenericDelegate<Int>()

    val another by GenericDelegate<Float>()}

But in this case, the getValue() method of the delegate object will return an instance of the Object type, and a cast to your generic type will occur:

 @Nullable   public final Integer getProperty() {      return (Integer)this.property$delegate.getValue(this, $$delegatedProperties[ ...