itkConditionalConstIterator.h

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

  Program:   Insight Segmentation & Registration Toolkit
  Module:    $RCSfile: itkConditionalConstIterator.h,v $
  Language:  C++
  Date:      $Date: 2007-01-30 20:56:07 $
  Version:   $Revision: 1.10 $

  Copyright (c) Insight Software 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 __itkConditionalConstIterator_h
#define __itkConditionalConstIterator_h

#include "itkIndex.h"

namespace itk
{

template<class TImage>
class ConditionalConstIterator {
public:
  typedef ConditionalConstIterator Self;
  
  itkStaticConstMacro(NDimension, unsigned int, TImage::ImageDimension);

  typedef typename TImage::IndexType  IndexType;

  typedef typename TImage::SizeType    SizeType;

  typedef typename TImage::RegionType    RegionType;

  typedef TImage   ImageType;

  typedef typename TImage::InternalPixelType   InternalPixelType;

  typedef typename TImage::PixelType   PixelType;

  virtual bool IsPixelIncluded(const IndexType & index) const = 0;
  
  Self &operator=(const Self& it)
    {
    m_Image = it.m_Image;     // copy the smart pointer
    m_Region = it.m_Region;   // copy the region
    return *this;
    }
  
  static unsigned int GetIteratorDimension() 
    {return TImage::ImageDimension;}

  virtual const IndexType GetIndex() = 0;

  virtual const PixelType & Get(void) const = 0;
  
  virtual bool IsAtEnd() = 0;

  virtual void operator++() = 0;
  
  ConditionalConstIterator();

  virtual ~ConditionalConstIterator();

protected: //made protected so other iterators can access 
  //SmartPointer<const ImageType> m_Image;
  typename ImageType::ConstWeakPointer m_Image;

  RegionType m_Region;

  bool m_IsAtEnd;
};

} // end namespace itk

// Define instantiation macro for this template.
#define ITK_TEMPLATE_ConditionalConstIterator(_, EXPORT, x, y) namespace itk { \
  _(1(class EXPORT ConditionalConstIterator< ITK_TEMPLATE_1 x >)) \
  namespace Templates { typedef ConditionalConstIterator< ITK_TEMPLATE_1 x > \
                                            ConditionalConstIterator##y; } \
  }

#if ITK_TEMPLATE_EXPLICIT
# include "Templates/itkConditionalConstIterator+-.h"
#endif

#if ITK_TEMPLATE_TXX
# include "itkConditionalConstIterator.txx"
#endif

#endif