--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/samples/main-packet-tag.cc	Wed Aug 08 11:15:45 2007 +0200
@@ -0,0 +1,135 @@
+/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
+/*
+ * Copyright (c) 2006,2007 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>
+ */
+#include "ns3/tag.h"
+#include "ns3/packet.h"
+#include <iostream>
+
+using namespace ns3;
+
+// define this class in a public header
+class MyTag : public Tag
+{
+public:
+  // we have to define a public constructor
+  MyTag ();
+  // we have to define a public copy constructor
+  MyTag (const MyTag &other);
+  // we have to define a public destructor
+  ~MyTag ();
+  // we have to define a public static GetUid method
+  static uint32_t GetUid (void);
+  // we have to define a public Print method
+  void Print (std::ostream &os) const;
+  // we have to define a public GetSerializedSize method
+  uint32_t GetSerializedSize (void) const;
+  // we have to define a public Serialize method
+  void Serialize (Buffer::Iterator i) const;
+  // we have to define a public Deserialize method
+  uint32_t Deserialize (Buffer::Iterator i);
+  
+  // these are our accessors to our tag structure
+  void SetSimpleValue (uint8_t value);
+  uint8_t GetSimpleValue (void) const;
+private:
+  uint8_t m_simpleValue;
+};
+
+MyTag::MyTag ()
+{}
+MyTag::MyTag (const MyTag &other)
+  : m_simpleValue (other.m_simpleValue)
+{}
+MyTag::~MyTag ()
+{}
+uint32_t 
+MyTag::GetUid (void)
+{
+  // we input a unique string to AllocateUid
+  // to avoid name collisions.
+  static uint32_t uid = AllocateUid<MyTag> ("MyTag.tests.nsnam.org");
+  return uid;
+}
+void 
+MyTag::Print (std::ostream &os) const
+{
+  // print the content of this tag for Packet::PrintTags
+  os << (uint32_t)m_simpleValue;
+}
+uint32_t 
+MyTag::GetSerializedSize (void) const
+{
+  // we do not want to deal with parallel simulations
+  // so we return 0.
+  return 0;
+}
+void 
+MyTag::Serialize (Buffer::Iterator i) const
+{
+  // we will never be invoked because we are not doing
+  // parallel simulations so, we assert.
+  NS_ASSERT (false);
+}
+uint32_t
+MyTag::Deserialize (Buffer::Iterator i)
+{
+  // we will never be invoked because we are not doing
+  // parallel simulations so, we assert.
+  NS_ASSERT (false);
+  // theoretically, return the number of bytes read
+  return 0;
+}
+
+
+void 
+MyTag::SetSimpleValue (uint8_t value)
+{
+  m_simpleValue = value;
+}
+uint8_t 
+MyTag::GetSimpleValue (void) const
+{
+  return m_simpleValue;
+}
+
+
+int main (int argc, char *argv[])
+{
+  // create a tag.
+  MyTag tag;
+  tag.SetSimpleValue (0x56);
+
+  // store the tag in a packet.
+  Packet p;
+  p.AddTag (tag);
+
+  // create a copy of the packet
+  Packet aCopy = p;
+
+  // read the tag from the packet copy
+  MyTag tagCopy;
+  p.PeekTag (tagCopy);
+
+  // the copy and the original are the same !
+  NS_ASSERT (tagCopy.GetSimpleValue () == tag.GetSimpleValue ());
+
+  aCopy.PrintTags (std::cout);
+
+  return 0;
+}