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Removing Items from the Queue

Listing 4 shows the code for removing items from the queue.

Listing 4 Removing Queue Items

const QueueElementPtr NMSServiceQueue::remove(void)
{
  QueueElementPtr tempQueueItem;
  QueueElementPtr nextQueueItem;

  if (queueIsEmpty())
  {
    return NULL;
  }
  else
  {
    tempQueueItem = startOfQueue;
    nextQueueItem = startOfQueue->nextQueueElement;

    if (nextQueueItem != NULL)
      startOfQueue->nextQueueElement = nextQueueItem;

    startOfQueue = tempQueueItem->nextQueueElement;

    return tempQueueItem;
  }
}

As for Listing 3, Listing 4 updates the two variables startOfQueue and endOfQueue in conjunction with items being removed from the queue.

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