object Delegates
Standard property delegates.
Returns a property delegate for a read/write property with a non-null
value that is initialized not during object construction time but at a later time. Trying to read the property before the initial value has been assigned results in an exception.
fun <T : Any> notNull(): ReadWriteProperty<Any?, T>
Returns a property delegate for a read/write property that calls a specified callback function when changed.
fun <T> observable( initialValue: T, onChange: (property: KProperty<*>, oldValue: T, newValue: T) -> Unit ): ReadWriteProperty<Any?, T>
Returns a property delegate for a read/write property that calls a specified callback function when changed, allowing the callback to veto the modification.
fun <T> vetoable( initialValue: T, onChange: (property: KProperty<*>, oldValue: T, newValue: T) -> Boolean ): ReadWriteProperty<Any?, T>
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https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.properties/-delegates/index.html