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RefCountable.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
 * phone: ++49-241-80-27910,
 * fax: ++49-241-80-22242
 * email: info@openwns.org
 * 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
 * details.
 *
 * You should have received a copy of the GNU Lesser General Public License
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#ifndef WNS_REFCOUNTABLE_HPP
#define WNS_REFCOUNTABLE_HPP

#include <WNS/Assure.hpp>
#include <stdint.h>

namespace wns {
    class RefCountable
    {
        template<class> friend class SmartPtr;
    public:
        long int
        getRefCount() const
        {
            return count;
        }

    protected:
        RefCountable() :
            count(0)
        {}

        RefCountable(const RefCountable&) :
            count(0)
        {}

        virtual
        ~RefCountable()
        {}

    private:
        void
        incRefCount() const
        {
            ++count;
        }

        void
        decRefCount() const
        {
            assure(count>0,
                   "Can't deref object with reference count<=0. "
                   "This is normally an indication that "
                   "someone did mess around with the SmartPtr.");
            if(--count <= 0) {
                delete this;
            }
        }

        mutable long int count;
    };
} // wns

#endif

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