Jericho2Code

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

Jericho2Code

import android.content.SharedPreferences
import kotlin.properties.ReadWriteProperty
import kotlin.reflect.KProperty

class Preference<T>(
    private val preferences: SharedPreferences,
    private val name: String,
    private val default: T
) : ReadWriteProperty<Any?, T> {

Jericho2Code

import android.arch.persistence.room.TypeConverter
import com.google.gson.Gson
import com.google.gson.reflect.TypeToken
import java.lang.reflect.Type

open class BaseConverter<T>(private val type: Class<T>) {

    private val gson = Gson()

    @TypeConverter