fun <T> AlertDialog.Builder.setItemsIndexed(items: Array<T>,
                                            toString: (T) -> String,
                                            onClick: (DialogInterface, T, Int) -> Unit): AlertDialog.Builder {
    return this.setItems(items.map { toString(it) }.toTypedArray()) { dialog, i ->
        onClick(dialog, items[i], i)
    }
}