Simple implementation of DiffUtil.ItemCallback uses Kotlin

BaseDiffCallback.kt

class BaseDiffCallback<T>(
        val isItemsSame: (old: T, new: T) -> Boolean,
        val isContentsSame: (old: T, new: T) -> Boolean = { old, new -> old == new }
) : DiffUtil.ItemCallback<T>() {
    override fun areItemsTheSame(old: T, new: T): Boolean = isItemsSame(old, new)
    override fun areContentsTheSame(old: T, new: T): Boolean = isContentsSame(old, new)
}

//sample

data class Item(val id: Long, val data: String)

fun test() {
    val callback = BaseDiffCallback<Item>({ old, new -> old.id == new.id })
    //use of callback
}