var queue = CircularQueue<Int>(size: 2, startValue: 1)
queue.put(value: 2)
queue.put(value: 3)


var val = queue.get()
repeat {
    print(val ?? nil)
    val = queue.get()
} while(val != nil)

queue.put(value: 5)
repeat {
    print(val)
    val = queue.get()
} while(val != nil)

Optional(3)
Optional(2)
Optional(1)
Optional(1)
nil
Optional(5)