interface ReadOnlyProperty<in R, out T>
Base interface that can be used for implementing property delegates of read-only properties.
This is provided only for convenience; you don't have to extend this interface as long as your property delegate has methods with the same signatures.
R - the type of object which owns the delegated property.
T - the type of the property value.
Returns the value of the property for the given object.
abstract operator fun getValue( thisRef: R, property: KProperty<*> ): T
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https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.properties/-read-only-property/index.html