--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/tools/model/event-garbage-collector.h	Thu Mar 24 09:23:44 2011 -0700
@@ -0,0 +1,71 @@
+/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
+/*
+ * Copyright (c) 2007 INESC Porto
+ *
+ * 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: Gustavo J. A. M. Carneiro  <gjc@inescporto.pt>
+ */
+#ifndef EVENT_GARBAGE_COLLECTOR_H
+#define EVENT_GARBAGE_COLLECTOR_H
+
+#include <set>
+#include "ns3/event-id.h"
+#include "ns3/simulator.h"
+
+namespace ns3 {
+
+/**
+ * \brief An object that tracks scheduled events and automatically
+ * cancels them when it is destroyed.  It is useful in situations
+ * where multiple instances of the same type of event can
+ * simultaneously be scheduled, and when the events should be limited
+ * to the lifetime of a container object.
+ */
+class EventGarbageCollector
+{
+public:
+
+  EventGarbageCollector ();
+
+  /**
+   * \brief Tracks a new event
+   */
+  void Track (EventId event);
+
+  ~EventGarbageCollector ();
+
+private:
+
+  struct EventIdLessThanTs
+  {
+    bool operator () (const EventId &a, const EventId &b) const
+    {
+      return (a.GetTs () < b.GetTs ());
+    }
+  };
+
+  typedef std::multiset<EventId, EventIdLessThanTs> EventList;
+
+  EventList::size_type m_nextCleanupSize;
+  EventList m_events;
+
+  void Cleanup ();
+  void Grow ();
+  void Shrink ();
+};
+
+}; // namespace ns3
+
+#endif /* EVENT_GARBAGE_COLLECTOR_H */