Maximum Length for scala queue

Question

I\'m curious if Scala has some gem hidden in its collection classes that I can use. Basically I\'m looking for something like a FIFO queue, but that has an upper-limit on i

Answer 1

This is the approach I toke with extending Scala's standard mutable.Queue class.

class LimitedQueue[A](maxSize: Int) extends mutable.Queue[A] {
  override def +=(elem: A): this.type = {
    if (length >= maxSize) dequeue()
    appendElem(elem);
    this
  }
}

And simple use-case

var q2 = new LimitedQueue[Int](2)
q2 += 1
q2 += 2
q2 += 3
q2 += 4
q2 += 5

q2.foreach { n =>
  println(n)
}

You'll get only 4 and 5 in the console as the old elements were dequeued beforehand.