MCRefPtr.h

#if !defined(__MCREFPTR_H_)
#define __MCREFPTR_H_

#ident "@(#)$Id: MCRefPtr.h,v 1.6 2004/12/02 07:05:20 mike Exp $"

/*
 * Copyright Miba Consulting Ltd. (c) 2000-2003
 * 
 * This library 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 2.1 of the License, or (at your option) any later version.
 * 
 * This library 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 library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 *
 */

#include "mcllib/MCRefCountAccessor.h"

namespace mcllib
{
    template<typename T,
        MCThreadModel::EModel MODEL = MCThreadModel::THRMODELMULTI>
    class MCRefPtr : public MCRefCountAccessorTmpl<MODEL>
    {
    public:
        MCRefPtr(T* pHdl = 0)
        {
            attach(pHdl);
        }
        ~MCRefPtr()
        {
            detach();
        }
        MCRefPtr(const MCRefPtr& r)
        {
            attach(r.m_pHdl);
        }
        MCRefPtr& operator=(const MCRefPtr& r)
        {
            // Don't do anything if assigning to self
            if (&r == this)
                return(*this);
            // Don't do anything if the pointers are the same
            if (r.m_pHdl == m_pHdl)
                return(*this);
            detach();
            attach(r);
            return(*this);
        }
        inline operator MCRefPtr<const T>&() const
        {
            return(*(reinterpret_cast<MCRefPtr<const T> *>(this)));
        }
        inline operator T*() const
        {
            return(m_pHdl);
        }
        inline T* operator->() const
        {
            return(m_pHdl);
        }
        inline bool operator<(const MCRefPtr<T>& t) const
        {
            return(m_pHdl < t.m_pHdl);
        }

    protected:
        void attach(T* pHdl);
        void detach();
        T* m_pHdl;
    };

    template<typename T, MCThreadModel::EModel MODEL>
    inline void MCRefPtr<T, MODEL>::attach(T* pHdl)
    {
        if (pHdl) {
            incCnt(pHdl);
        }
        m_pHdl = pHdl;
    }

    template<typename T, MCThreadModel::EModel MODEL>
    inline void MCRefPtr<T, MODEL>::detach()
    {
        if (m_pHdl && (decCnt(m_pHdl) == 0)) {
            delete m_pHdl;
        }
    }

    template<typename T,
        MCThreadModel::EModel MODEL = MCThreadModel::THRMODELMULTI>
    class MCRefPtrAttacher : public MCRefPtr<T, MODEL>
    {
    public:
        MCRefPtrAttacher(T* pHdl)
        {
            attach(pHdl);
            // Avoid detach
            m_pHdl = 0;
        }
    };

    template<typename T,
        MCThreadModel::EModel MODEL = MCThreadModel::THRMODELMULTI>
    class MCRefPtrDetacher : public MCRefPtr<T, MODEL>
    {
    public:
        MCRefPtrDetacher(T* pHdl)
        {
            // Avoid attach
            m_pHdl = pHdl;
        }
    };

};

#endif

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