pureRandom.scala

trait PureRandomGenerator {
  def next: (PureRandomGenerator, Int)
}

object PureRandomGenerator {
  def init(seed: Long): PureRandomGenerator = new PureRandomGenerator {
    def next = {
        val (newSeed, random) = getNewSeedAndRandom(seed) // here we generate a new seed
        (init(newSeed), random)
    }
  }
  
  def getNewSeedAndRandom(seed: Long): (Long, Int) =
     // uses any of PRNGs
    (12 + seed, (344 + seed).asInstanceOf[Int])
}

// usage:
val prg1 = PureRandomGenerator.init(1L)
val (prg2, random1) = prg1.next
val (prg3, random2) = prg2.next