text: //
  // Copyright (C) OpenSim Ltd.
  //
  // This program is free software; you can redistribute it and/or
  // modify it under the terms of the GNU Lesser General Public License
  // as published by the Free Software Foundation; either version 2
  // of the License, or (at your option) any later version.
  //
  // 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 Lesser General Public License for more details.
  //
  // You should have received a copy of the GNU Lesser General Public License
  // along with this program; if not, see http://www.gnu.org/licenses/.
  //
  
  #ifndef __INET_IPACKETCOMPARATORFUNCTION_H
  #define __INET_IPACKETCOMPARATORFUNCTION_H
  
  #include "inet/common/packet/Packet.h"
  #include "inet/queueing/compat/cqueue.h"
  
  namespace inet {
  namespace queueing {
  
  /**
   * This class defines the interface for packet comparator functions.
   */
  class INET_API IPacketComparatorFunction : public cQueue::Comparator
  {
    public:
      virtual ~IPacketComparatorFunction() {}
  
      /**
       * Returns the order of the given packets.
       */
      virtual int comparePackets(Packet *packet1, Packet *packet2) const = 0;
  
      // Implements cQueue::Comparator interface
      virtual bool less(cObject *a, cObject *b) override { return comparePackets(check_and_cast<Packet *>(a), check_and_cast<Packet *>(b)) < 0; }
  };
  
  } // namespace queueing
  } // namespace inet
  
  #endif // ifndef __INET_IPACKETCOMPARATORFUNCTION_H
  
  