An Iterator that cycles trough the given elements

CycleIterator.scala

class CycleIterator[B <: A, +A](elements: Iterable[B]) extends Iterator[A] {

  var iterator: Iterator[B] = Iterator.empty

  def hasNext: Boolean = {
    if (!iterator.hasNext) {
      iterator = elements.iterator
    }
    iterator.hasNext
  }

  def next(): A = iterator.next()

}

object CycleIterator {

  def apply[B <: A, A](xs: Iterable[B]): CycleIterator[B, A] = new CycleIterator[B, A](xs)

}