Lazy delegate with respect to context

Delegate.kt

object Delegates {
    /**
     * Lazy read-only property with respect to calling context in initializer
     * @param initializer Lazy initializer
     */
    public fun <T> contextLazy(initializer: Any?.() -> T): ReadOnlyProperty<Any?, T> = UnsafeContextLazy(initializer)
}

/**
 * Lazy read-only property with respect to calling context in initializer
 * @param initializer Lazy initializer
 * Not thread-safe!
 */
private class UnsafeContextLazy<out T>(private val initializer: Any?.() -> T) : ReadOnlyProperty<Any?, T> {
    private var value: T? = null

    override fun getValue(thisRef: Any?, property: KProperty<*>): T {
        if (null == value) {
            value = thisRef.initializer()
        }
        return value ?: throw IllegalStateException("Property ${property.name} failed to initialize with initializer.")
    }
}

I think that would be a good idea to copy-and-modify the code from stdlib: http://github.com/JetBrains/kotlin/blob/master/libraries/stdlib/src/kotlin/util/Lazy.kt#L37

It is very cleaver, for example it does not produce memory leaks.

Currently you code should not compile. Try to run it at http://try.kotlinlang.org/