itkSmartPointerForwardReference.h

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

  Program:   Insight Segmentation & Registration Toolkit
  Module:    $RCSfile: itkSmartPointerForwardReference.h,v $
  Language:  C++
  Date:      $Date: 2002/01/15 18:57:20 $
  Version:   $Revision: 1.7 $

  Copyright (c) 2002 Insight Consortium. All rights reserved.
  See ITKCopyright.txt or http://www.itk.org/HTML/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 notices for more information.

=========================================================================*/
#ifndef __itkSmartPointerForwardReference_h
#define __itkSmartPointerForwardReference_h

#include "itkMacro.h"
#include "itkWeakPointer.h"

#include <iostream>

namespace itk
{

template <class T>
class ITK_EXPORT SmartPointerForwardReference 
{
public:
  SmartPointerForwardReference () 
    {m_Pointer = 0;}

  SmartPointerForwardReference (const SmartPointerForwardReference<T> &p);
  
  SmartPointerForwardReference (const WeakPointer<T> &p);
  
  SmartPointerForwardReference (T *p);
  
  ~SmartPointerForwardReference ();
  
  T *operator -> () const;

  operator T * () const;
  
  T *GetPointer () const;
  
  bool operator < (const SmartPointerForwardReference &r);

  bool operator > (const SmartPointerForwardReference &r);

  bool operator <= (const SmartPointerForwardReference &r);

  bool operator >= (const SmartPointerForwardReference &r);

  SmartPointerForwardReference &operator = (const SmartPointerForwardReference &r);
  
  SmartPointerForwardReference &operator = (const WeakPointer<T> &r);
  
  SmartPointerForwardReference &operator = (T *r);
  
  T *Print (std::ostream& os) const;

private:
  T* m_Pointer;

  void Register();
  void UnRegister();
  
};
  
  template <typename T>
  std::ostream& operator<< (std::ostream& os, SmartPointerForwardReference<T> p) 
  {
    p.Print(os); 
    return os;
  }

} // end namespace itk
  
#endif

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