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

  Program:   Visualization Toolkit
  Module:    vtkHeap.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 vtkHeap_h
#define vtkHeap_h

#include "vtkCommonMiscModule.h" // For export macro
#include "vtkObject.h"

class vtkHeapBlock; //forward declaration

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

  void* AllocateMemory(size_t n);


  virtual void SetBlockSize(size_t);
  virtual size_t GetBlockSize() { return this->BlockSize;};


  vtkGetMacro(NumberOfBlocks,int);
  vtkGetMacro(NumberOfAllocations,int);

  void Reset();

  char* StringDup(const char* str);

protected:
  vtkHeap();
  ~vtkHeap();

  void Add(size_t blockSize);
  void CleanAll();
  vtkHeapBlock* DeleteAndNext();

  size_t BlockSize;
  int    NumberOfAllocations;
  int    NumberOfBlocks;
  int    Alignment;

  // Manage the blocks
  vtkHeapBlock* First;
  vtkHeapBlock* Last;
  vtkHeapBlock* Current;
  // Manage the memory in the block
  size_t Position; //the position in the Current block

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

#endif