itkSmartPointerForwardReference.h

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/*=========================================================================
 *
 *  Copyright Insight Software Consortium
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *         http://www.apache.org/licenses/LICENSE-2.0.txt
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 *
 *=========================================================================*/
#ifndef __itkSmartPointerForwardReference_h
#define __itkSmartPointerForwardReference_h

#include "itkWeakPointer.h"

#include <iostream>

namespace itk
{
template< typename T >
class SmartPointerForwardReference
{
public:
  SmartPointerForwardReference ()
  { m_Pointer = ITK_NULLPTR; }

  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