refcounted.h

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// Program Name: refcounted.h
// Created     : Oct. 21, 2005
//
// Purpose     : Reference Counted Base Class
//                                                                            
// Copyright (c) 2005 David Blain <dblain@mythtv.org>
//                                          
// Licensed under the GPL v2 or later, see COPYING for details                    
//

#ifndef __REFCOUNTED_H__
#define __REFCOUNTED_H__

#include <QMutex>

//
// RefCounted Class Definition/Implementation
// 

class RefCounted
{
    protected:

        long        m_nRefCount;
        QMutex      m_mutex;

    protected:

        // Destructor protected to force use of release;

        virtual ~RefCounted() {};

    public:

        // ------------------------------------------------------------------

        RefCounted() : m_nRefCount( 0 ) 
        {
        }

        // ------------------------------------------------------------------
        
        long AddRef()
        { 
            m_mutex.lock(); 
            long nRef = (++m_nRefCount);
            m_mutex.unlock();
    
            return( nRef );
        }

        // ------------------------------------------------------------------

        long Release() 
        { 

            m_mutex.lock(); 
            long nRef = (--m_nRefCount);
            m_mutex.unlock();

            if (nRef <= 0)
                delete this;

            return( nRef );
        }
};

#endif

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