/usr/include/ns3/event-garbage-collector.h is in libns3-dev 3.13+dfsg-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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/*
 * 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 {
/**
 * \ingroup tools
 *
 * \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 */
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