dox/Common/vtkGarbageCollector.h

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/*=========================================================================

  Program:   Visualization Toolkit
  Module:    vtkGarbageCollector.h

  Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
  All rights reserved.
  See Copyright.txt or http://www.kitware.com/Copyright.htm for details.

     This software is distributed WITHOUT ANY WARRANTY; without even
     the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
     PURPOSE.  See the above copyright notice for more information.

=========================================================================*/
#ifndef __vtkGarbageCollector_h
#define __vtkGarbageCollector_h

#include "vtkObject.h"
#include "vtkGarbageCollectorManager.h" // Needed for singleton initialization.

// This function is a friend of the collector so that it can call the
// internal report method.
void VTK_COMMON_EXPORT
vtkGarbageCollectorReportInternal(vtkGarbageCollector*,
                                  vtkObjectBase*, void*,
                                  const char*);

// This allows vtkObjectBase to get at the methods it needs.
class vtkObjectBaseToGarbageCollectorFriendship;

class VTK_COMMON_EXPORT vtkGarbageCollector : public vtkObject
{
public:
  vtkTypeMacro(vtkGarbageCollector,vtkObject);
  void PrintSelf(ostream& os, vtkIndent indent);
  static vtkGarbageCollector* New();

  static void Collect();

  static void Collect(vtkObjectBase* root);


  static void DeferredCollectionPush();
  static void DeferredCollectionPop();


  static void SetGlobalDebugFlag(int flag);
  static int GetGlobalDebugFlag();

protected:
  vtkGarbageCollector();
  ~vtkGarbageCollector();

private:

  static int GiveReference(vtkObjectBase* obj);

  static int TakeReference(vtkObjectBase* obj);

  // Singleton management functions.
  static void ClassInitialize();
  static void ClassFinalize();

  //BTX
  friend class vtkGarbageCollectorManager;
  friend class vtkObjectBaseToGarbageCollectorFriendship;
  //ETX

  // Internal report callback and friend function that calls it.
  virtual void Report(vtkObjectBase* obj, void* ptr, const char* desc);
  friend void VTK_COMMON_EXPORT
  vtkGarbageCollectorReportInternal(vtkGarbageCollector*,
                                    vtkObjectBase*, void*,
                                    const char*);

private:
  vtkGarbageCollector(const vtkGarbageCollector&);  // Not implemented.
  void operator=(const vtkGarbageCollector&);  // Not implemented.
};

//BTX
class vtkSmartPointerBase;


void VTK_COMMON_EXPORT
vtkGarbageCollectorReport(vtkGarbageCollector* collector,
                          vtkSmartPointerBase& ptr,
                          const char* desc);


template <class T>
void vtkGarbageCollectorReport(vtkGarbageCollector* collector, T*& ptr,
                               const char* desc)
{
  vtkGarbageCollectorReportInternal(collector, ptr, &ptr, desc);
}
//ETX

#endif

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