A custom delegate for a property that it's deleted after reading it, so it can only be used once.

GetAndForgetProperty.kt

import kotlin.properties.ReadWriteProperty
import kotlin.reflect.KProperty

/**
 * With this delegate, a property will only return it's value once. Subsequent queries will return the default value.
 */
class GetAndForgetProperty<in R, T>(private val defaultValue: T) : ReadWriteProperty<R, T> {

    companion object {
        fun <T> getAndForget(defaultValue: T): GetAndForgetProperty<Any, T> {
            return GetAndForgetProperty(defaultValue)
        }
    }

    private var value: T? = null

    override fun getValue(thisRef: R, property: KProperty<*>): T {
        val returnValue = value ?: defaultValue
        value = null
        return returnValue
    }

    override fun setValue(thisRef: R, property: KProperty<*>, value: T) {
        this.value = value
    }
}