itkConstSliceIterator.h

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

  Program:   Insight Segmentation & Registration Toolkit
  Module:    $RCSfile: itkConstSliceIterator.h,v $
  Language:  C++
  Date:      $Date: 2002/01/15 18:56:30 $
  Version:   $Revision: 1.4 $

  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 __itkConstSliceIterator_h
#define __itkConstSliceIterator_h

#include "itkMacro.h"
#include "itkExceptionObject.h"
#include <valarray>
namespace itk {

template<class TPixel, class TContainer>
class ITK_EXPORT ConstSliceIterator
{
public:
  ConstSliceIterator(const TContainer *n, std::slice s)
    : m_ContainerPointer(n), m_Pos(0), m_Slice(s) {}

  ConstSliceIterator Begin()
  {
    ConstSliceIterator ans = *this;
    ans.m_Pos = 0;
    return ans;
  }
  
  ConstSliceIterator End()
  {
    ConstSliceIterator ans = *this;
    ans.m_Pos = m_Slice.size();
    return ans;
  }

  ConstSliceIterator operator++()
  {
    m_Pos++;
    return *this;
  }

  ConstSliceIterator operator++(int)
  {
    ConstSliceIterator ans  = *this;
    m_Pos++;
    return ans;
  }

  const TPixel& operator[](unsigned long n)
  {
    return this->Loc(m_Pos=n);
  }

  const TPixel& operator*()
  {
    return Loc(m_Pos);
  }

  bool operator==(const ConstSliceIterator &orig)
  {
    return orig.m_Pos==this->m_Pos
      &&   orig.m_Slice.stride()==this->m_Slice.stride()
      &&   orig.m_Slice.start() ==this->m_Slice.start();
  }
  
  bool operator!=(const ConstSliceIterator &orig)
  {
    return ! operator==(orig);
  }

  bool operator<(const ConstSliceIterator &orig)
  {
    return this->m_Pos < orig.m_Pos
      &&   this->m_Slice.stride()==orig.m_Slice.stride()
      &&   this->m_Slice.start()==orig.m_Slice.start();
  }
  
private:
  const TPixel& Loc(unsigned long n) const
  {
    return (*m_ContainerPointer)[m_Slice.start()
                                       + n * m_Slice.stride()];
  }  

  const TContainer *m_ContainerPointer;

  unsigned long m_Pos;

  std::slice m_Slice;
};
  
} // end namespace itk

#endif

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