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#ifndef _GEMFIRE_SHAREDBASE_HPP_
#define _GEMFIRE_SHAREDBASE_HPP_


// SharedBase.hpp     -*- mode: c++ -*-


/*=========================================================================
 * (c) Copyright 2004-2007, GemStone Systems, Inc. All Rights Reserved.
 * 1260 NW Waterhouse Ave Suite 200, Beaverton OR 97006.
 *=========================================================================
 */


#include "gfcpp_globals.hpp"

namespace gemfire {


class CPPCACHE_EXPORT SharedBase {

public:

  inline SharedBase() :
    m_refCount(0)
  {
  }

  void preserveSB() const;

  void releaseSB() const;

  inline int32_t refCount()
  {
    return m_refCount;
  }

protected:

  inline SharedBase(bool noInit)
    {}

  virtual ~SharedBase()
    {}


private:

  mutable volatile int32_t m_refCount;

  void operator = (const SharedBase& rhs);

};

  class CPPCACHE_EXPORT NullSharedBase: public SharedBase
  {
  public:
    static const NullSharedBase* const s_instancePtr;

  private:
    NullSharedBase() { }
    // never defined
    NullSharedBase(const NullSharedBase&);
    NullSharedBase& operator =(const NullSharedBase&);

    friend class SharedBase; // just to get rid of warning with gcc3.x
  };

}

#define NULLPTR gemfire::NullSharedBase::s_instancePtr

#endif //#define _GEMFIRE_SHAREDBASE_HPP_

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