fun <R, T> Delegates.of(prop: KMutableProperty<T>): ReadWriteProperty<R, T> =
    object : ReadWriteProperty<R, T> {

        override fun getValue(thisRef: R, property: KProperty<*>): T =
            prop.getter.call()

        override fun setValue(thisRef: R, property: KProperty<*>, value: T) {
            prop.setter.call(value)
        }

    }

fun <R, T> Delegates.of(prop: KProperty<T>): ReadOnlyProperty<R, T> =
    object : ReadOnlyProperty<R, T> {

        override fun getValue(thisRef: R, property: KProperty<*>): T =
            prop.getter.call()

    }

val x: Int by Delegates.of(a::x)