IntrusiveCountableBase.hpp

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//
//  Copyright (c) 2001, 2002 Peter Dimov
//
//  Permission to copy, use, modify, sell and distribute this software
//  is granted provided this copyright notice appears in all copies.
//  This software is provided "as is" without express or implied
//  warranty, and with no claim as to its suitability for any purpose.
//

#ifndef BLOCXX_INTRUSIVE_COUNTABLE_BASE_HPP_INCLUDE_GUARD_
#define BLOCXX_INTRUSIVE_COUNTABLE_BASE_HPP_INCLUDE_GUARD_

#include "blocxx/BLOCXX_config.h"
#include "blocxx/RefCount.hpp"

namespace BLOCXX_NAMESPACE
{

class IntrusiveCountableBase; 
void IntrusiveReferenceAddRef(IntrusiveCountableBase * p); 
void IntrusiveReferenceRelease(IntrusiveCountableBase * p); 

class BLOCXX_COMMON_API IntrusiveCountableBase
{
private:
   RefCount m_useCount;

protected:
   IntrusiveCountableBase()
      : m_useCount(0)
   {
   }
   
   IntrusiveCountableBase(const IntrusiveCountableBase&)
      : m_useCount(0)
   {
   }
   
   IntrusiveCountableBase& operator=(const IntrusiveCountableBase&)
   {
      // don't change m_useCount
      return *this;
   }

   virtual ~IntrusiveCountableBase();

public:
   inline friend void IntrusiveReferenceAddRef(IntrusiveCountableBase * p)
   {
      p->m_useCount.inc();
   }

   inline friend void IntrusiveReferenceRelease(IntrusiveCountableBase * p)
   {
      if (p->m_useCount.decAndTest())
         delete p;
   }
};

} // end namespace BLOCXX_NAMESPACE

#endif