diff -r 1faf35545dfd -r 07d34c0d8d18 src/common/packet-tag-list.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/common/packet-tag-list.h	Wed Jun 03 08:49:40 2009 +0200
@@ -0,0 +1,142 @@
+/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
+/*
+ * Copyright (c) 2006 INRIA
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation;
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ *
+ * Author: Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
+ */
+#ifndef PACKET_TAG_LIST_H
+#define PACKET_TAG_LIST_H
+
+#include <stdint.h>
+#include <ostream>
+#include "ns3/type-id.h"
+
+namespace ns3 {
+
+class Tag;
+
+/**
+ * \ingroup constants
+ * \brief Tag maximum size
+ * The maximum size (in bytes) of a Tag is stored
+ * in this constant.
+ */
+#define PACKET_TAG_MAX_SIZE 20
+
+class PacketTagList 
+{
+public:
+  struct TagData {
+    uint8_t data[PACKET_TAG_MAX_SIZE];
+    struct TagData *next;
+    TypeId tid;
+    uint32_t count;
+  };
+
+  inline PacketTagList ();
+  inline PacketTagList (PacketTagList const &o);
+  inline PacketTagList &operator = (PacketTagList const &o);
+  inline ~PacketTagList ();
+
+  void Add (Tag const&tag) const;
+  bool Remove (Tag &tag);
+  bool Peek (Tag &tag) const;
+  inline void RemoveAll (void);
+
+  const struct PacketTagList::TagData *Head (void) const;
+
+private:
+
+  bool Remove (TypeId tid);
+  struct PacketTagList::TagData *AllocData (void) const;
+  void FreeData (struct TagData *data) const;
+
+  static struct PacketTagList::TagData *g_free;
+  static uint32_t g_nfree;
+
+  struct TagData *m_next;
+};
+
+} // namespace ns3
+
+/****************************************************
+ *  Implementation of inline methods for performance
+ ****************************************************/
+
+namespace ns3 {
+
+PacketTagList::PacketTagList ()
+  : m_next ()
+{}
+
+PacketTagList::PacketTagList (PacketTagList const &o)
+  : m_next (o.m_next)
+{
+  if (m_next != 0) 
+    {
+      m_next->count++;
+    }
+}
+
+PacketTagList &
+PacketTagList::operator = (PacketTagList const &o)
+{
+  // self assignment
+  if (m_next == o.m_next) 
+    {
+      return *this;
+    }
+  RemoveAll ();
+  m_next = o.m_next;
+  if (m_next != 0) 
+    {
+      m_next->count++;
+    }
+  return *this;
+}
+
+PacketTagList::~PacketTagList ()
+{
+  RemoveAll ();
+}
+
+void
+PacketTagList::RemoveAll (void)
+{
+  struct TagData *prev = 0;
+  for (struct TagData *cur = m_next; cur != 0; cur = cur->next) 
+    {
+      cur->count--;
+      if (cur->count > 0) 
+        {
+          break;
+        }
+      if (prev != 0) 
+        {
+          FreeData (prev);
+        }
+      prev = cur;
+    }
+  if (prev != 0) 
+    {
+      FreeData (prev);
+    }
+  m_next = 0;
+}
+
+} // namespace ns3
+
+#endif /* PACKET_TAG_LIST_H */