MeVis/Foundation/Sources/MLMemoryManager/Include/mlWeakMemoryBlockHandle.h

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// **InsertLicense** code
//-----------------------------------------------------------------------------
// The weak handle of a memory block.
//
// \file    mlWeakMemoryBlockHandle.h
// \author  Marcus Barann
// \date    03/2008
//
//-----------------------------------------------------------------------------

#ifndef MLWEAKMEMORYBLOCKHANDLE_H_INCLUDED
#define MLWEAKMEMORYBLOCKHANDLE_H_INCLUDED


#include "../mlMemoryManagerDllExport.h"

class MLMemoryBlock;
class MLMemoryBlockHandle;



class MLMEMORYMANAGER_EXPORT MLWeakMemoryBlockHandle
{
public:
  MLWeakMemoryBlockHandle();

  MLWeakMemoryBlockHandle(const MLMemoryBlockHandle& memoryBlockHandle);

  MLWeakMemoryBlockHandle(const MLWeakMemoryBlockHandle& weakMemoryBlockHandle);

  ~MLWeakMemoryBlockHandle();



  MLWeakMemoryBlockHandle& operator=(const MLMemoryBlockHandle& memoryBlockHandle);

  MLWeakMemoryBlockHandle& operator=(const MLWeakMemoryBlockHandle& weakMemoryBlockHandle);

  bool isNull() const;
 // End of group ThreadSafe

  void clear();

#ifndef DOXYGEN_SHOULD_SKIP_THIS
private:
  void memoryBlockIsDeleted();
  MLMemoryBlock* setMemoryBlock(MLMemoryBlock* memoryBlock);
  void setMemoryBlockFromStrongHandle(const MLMemoryBlockHandle& memoryBlockHandle);
  void setMemoryBlockFromWeakHandle(const MLWeakMemoryBlockHandle& weakMemoryBlockHandle);


private:
  MLMemoryBlock*           _memoryBlock;
  MLWeakMemoryBlockHandle* _next;
  MLWeakMemoryBlockHandle* _previous;

  friend class MLMemoryBlock;
  friend class MLMemoryBlockHandle;
  friend class MLMemoryManager;
#endif
};

#endif // MLWEAKMEMORYBLOCKHANDLE_H_INCLUDED