mlWeakMemoryBlockHandle.h

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/*************************************************************************************
**
** Copyright 2008, MeVis Medical Solutions AG
**
** The user may use this file in accordance with the license agreement provided with
** the Software or, alternatively, in accordance with the terms contained in a
** written agreement between the user and MeVis Medical Solutions AG.
**
** For further information use the contact form at https://www.mevislab.de/contact
**
**************************************************************************************/
 
#ifndef ML_WEAK_MEMORY_BLOCK_HANDLE_H
#define ML_WEAK_MEMORY_BLOCK_HANDLE_H
 
#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();
 
  bool deletionOngoing() const;
 
 
#ifndef DOXYGEN_SHOULD_SKIP_THIS
private:
  void markMemoryBlockWasDeleted();

  MLMemoryBlock* setMemoryBlock(MLMemoryBlock* memoryBlock);
  void setMemoryBlockFromStrongHandle(const MLMemoryBlockHandle& memoryBlockHandle);
  void setMemoryBlockFromWeakHandle(const MLWeakMemoryBlockHandle& weakMemoryBlockHandle);
 
 
  MLMemoryBlock*           _memoryBlock;
  MLWeakMemoryBlockHandle* _next;
  MLWeakMemoryBlockHandle* _previous;
  bool                     _deletionOngoing;
 
  friend class MLMemoryBlock;
  friend class MLMemoryBlockHandle;
  friend class MLMemoryManager;
#endif
};
 
#endif // MLWEAKMEMORYBLOCKHANDLE_H_INCLUDED