SharedPreferences under Delegated properties - generic type class.

Generic.kt

class Generic<T : Any>(val c: Class<T>) {
    companion object {
        /**
         * Returns generic's argument class.
         */
        inline operator fun <reified T : Any> invoke() = Generic(T::class.java)
    }

    /**
     * Check if value is instance of desired class.
     */
    fun checkType(t: Any) = c.isAssignableFrom(t.javaClass)
}