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ObserverInterface.hpp

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/*******************************************************************************
 * This file is part of openWNS (open Wireless Network Simulator)
 * _____________________________________________________________________________
 *
 * Copyright (C) 2004-2007
 * Chair of Communication Networks (ComNets)
 * Kopernikusstr. 16, D-52074 Aachen, Germany
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 * fax: ++49-241-80-22242
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 * www: http://www.openwns.org
 * _____________________________________________________________________________
 *
 * openWNS is free software; you can redistribute it and/or modify it under the
 * terms of the GNU Lesser General Public License version 2 as published by the
 * Free Software Foundation;
 *
 * openWNS 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
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#ifndef WNS_OBSERVERINTERFACE_HPP
#define WNS_OBSERVERINTERFACE_HPP

#include <WNS/SubjectInterface.hpp>

namespace wns {

    // We need to make Subject a friend of ObserverInterface
    template <class NOTIFICATIONINTERFACE>
    class Subject;

    template <class NOTIFICATIONINTERFACE>
    class ObserverInterface :
        virtual public NOTIFICATIONINTERFACE
    {
        friend class Subject<NOTIFICATIONINTERFACE>;
    public:
        typedef NOTIFICATIONINTERFACE NotificationType;

        typedef SubjectInterface<ObserverInterface> SubjectType;

        virtual
        ~ObserverInterface()
        {
        }

    private:
        virtual void
        addSubject(SubjectType* subject) = 0;

        virtual void
        removeSubject(SubjectType* subject) = 0;
    };
}

#endif

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