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itkNthElementPixelAccessor.h

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00001 /*=========================================================================
00002 
00003   Program:   Insight Segmentation & Registration Toolkit
00004   Module:    $RCSfile: itkNthElementPixelAccessor.h,v $
00005   Language:  C++
00006   Date:      $Date: 2002/10/01 01:00:43 $
00007   Version:   $Revision: 1.9 $
00008 
00009   Copyright (c) 2002 Insight Consortium. All rights reserved.
00010   See ITKCopyright.txt or http://www.itk.org/HTML/Copyright.htm for details.
00011 
00012      This software is distributed WITHOUT ANY WARRANTY; without even 
00013      the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR 
00014      PURPOSE.  See the above copyright notices for more information.
00015 
00016 =========================================================================*/
00017 #ifndef __itkNthElementPixelAccessor_h
00018 #define __itkNthElementPixelAccessor_h
00019 
00020 #include "itkMacro.h"
00021 
00022 namespace itk
00023 {
00024 
00047 template < class T, class TContainer >
00048 class ITK_EXPORT NthElementPixelAccessor
00049 {
00050 public:
00052   typedef   NthElementPixelAccessor        Self;
00053 
00055   typedef T ExternalType;
00056 
00059   typedef   TContainer    InternalType;
00060 
00062   inline void Set( InternalType & output, const ExternalType & input ) const 
00063     { output[m_ElementNumber] =  input; }
00064 
00066   inline ExternalType Get( const InternalType & input ) const
00067     { return static_cast<ExternalType>( input[m_ElementNumber] ); }
00068 
00070   unsigned int GetElementNumber(void) const
00071     { return m_ElementNumber; }
00072 
00074   void SetElementNumber( unsigned int nth )
00075     { m_ElementNumber = nth; }
00076 
00079   bool operator!=(const Self& accessor) const
00080     {
00081       return (m_ElementNumber != accessor.m_ElementNumber);
00082     }
00083 
00085   NthElementPixelAccessor & operator=( const NthElementPixelAccessor & accessor )
00086     {
00087     m_ElementNumber = accessor.m_ElementNumber;
00088     return *this;
00089     }
00090   
00092   NthElementPixelAccessor()
00093     {
00094     m_ElementNumber = 0;
00095     }
00096 
00097 private:
00098   // Identifier of the N-th element to be accessed
00099   unsigned int    m_ElementNumber;
00100 
00101 };
00102 
00103   
00104 }  // end namespace itk
00105 
00106 #endif
00107 

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