Turn a RxJava Single or Maybe into a Kotlin delegate

rxjava.kt

import io.reactivex.Maybe
import io.reactivex.Single
import kotlin.properties.ReadOnlyProperty
import kotlin.reflect.KProperty

operator fun <T> Single<T>.provideDelegate(thisRef: Any?, property: KProperty<*>): ReadOnlyProperty<Any?, T> {
    return SingleDelegate(this)
}

private class SingleDelegate<out T>(single: Single<T>) : ReadOnlyProperty<Any?, T> {
    private val delegate = single.cache()

    init {
        delegate.subscribe()
    }

    override fun getValue(thisRef: Any?, property: KProperty<*>): T {
        return delegate.blockingGet()
    }
}

operator fun <T> Maybe<T>.provideDelegate(thisRef: Any?, property: KProperty<*>): ReadOnlyProperty<Any?, T?> {
    return MaybeDelegate(this)
}

private class MaybeDelegate<out T>(maybe: Maybe<T>) : ReadOnlyProperty<Any?, T?> {
    private val delegate = maybe.cache()

    init {
        delegate.subscribe()
    }

    override fun getValue(thisRef: Any?, property: KProperty<*>): T? {
        return delegate.blockingGet()
    }
}