network: Add a Remove method to the Queue base class

src/network/utils/queue.cc

@@ -158,6 +158,32 @@ Queue::Dequeue (void)
   return item;
 }
 
+Ptr<QueueItem>
+Queue::Remove (void)
+{
+  NS_LOG_FUNCTION (this);
+
+  if (m_nPackets.Get () == 0)
+    {
+      NS_LOG_LOGIC ("Queue empty");
+      return 0;
+    }
+
+  Ptr<QueueItem> item = DoRemove ();
+
+  if (item != 0)
+    {
+      NS_ASSERT (m_nBytes.Get () >= item->GetPacketSize ());
+      NS_ASSERT (m_nPackets.Get () > 0);
+
+      m_nBytes -= item->GetPacketSize ();
+      m_nPackets--;
+
+      Drop (item);
+    }
+  return item;
+}
+
 void
 Queue::DequeueAll (void)
 {