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class ItemRecyclerAdapter() : PagedListAdapter<Item, ItemHolder>(diffCallback) {
    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): ItemHolder {
        val view = LayoutInflater.from(parent.context)
            .inflate(R.layout.recycler_view_item, parent, false) as View
        return ItemHolder(view)
    }

    override fun onBindViewHolder(holder: ItemHolder, position: Int) {
        holder.title.text = getItem(position)?.title
    }

    companion object {
        private val diffCallback = object : DiffUtil.ItemCallback<Item>() {
            override fun areItemsTheSame(oldItem: Item, newItem: Item) =
                oldItem.id == newItem.id // check uniqueness

            override fun areContentsTheSame(oldItem: Item, newItem: Item) =
                oldItem == newItem // check contents
        }
    }
}

class ItemHolder(private val view: View) : RecyclerView.ViewHolder(view) {
    val title = view.title
}