itkNthElementPixelAccessor.h

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

  Program:   Insight Segmentation & Registration Toolkit
  Module:    $RCSfile: itkNthElementPixelAccessor.h,v $
  Language:  C++
  Date:      $Date: 2002/10/01 01:00:43 $
  Version:   $Revision: 1.9 $

  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 __itkNthElementPixelAccessor_h
#define __itkNthElementPixelAccessor_h

#include "itkMacro.h"

namespace itk
{

template < class T, class TContainer >
class ITK_EXPORT NthElementPixelAccessor
{
public:
  typedef   NthElementPixelAccessor        Self;

  typedef T ExternalType;

  typedef   TContainer    InternalType;

  inline void Set( InternalType & output, const ExternalType & input ) const 
    { output[m_ElementNumber] =  input; }

  inline ExternalType Get( const InternalType & input ) const
    { return static_cast<ExternalType>( input[m_ElementNumber] ); }

  unsigned int GetElementNumber(void) const
    { return m_ElementNumber; }

  void SetElementNumber( unsigned int nth )
    { m_ElementNumber = nth; }

  bool operator!=(const Self& accessor) const
    {
      return (m_ElementNumber != accessor.m_ElementNumber);
    }

  NthElementPixelAccessor & operator=( const NthElementPixelAccessor & accessor )
    {
    m_ElementNumber = accessor.m_ElementNumber;
    return *this;
    }
  
  NthElementPixelAccessor()
    {
    m_ElementNumber = 0;
    }

private:
  // Identifier of the N-th element to be accessed
  unsigned int    m_ElementNumber;

};

  
}  // end namespace itk

#endif

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