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itkSliceIterator.h

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00001 /*=========================================================================
00002 
00003   Program:   Insight Segmentation & Registration Toolkit
00004   Module:    $RCSfile: itkSliceIterator.h,v $
00005   Language:  C++
00006   Date:      $Date: 2003/09/10 14:29:26 $
00007   Version:   $Revision: 1.12 $
00008 
00009   Copyright (c) Insight Software 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 __itkSliceIterator_h
00018 #define __itkSliceIterator_h
00019 
00020 #include "itkMacro.h"
00021 #include "itkExceptionObject.h"
00022 #include <valarray>
00023 namespace itk {
00024 
00044 template<class TPixel, class TContainer>
00045 class ITK_EXPORT SliceIterator
00046 {
00047 public:
00049   SliceIterator(TContainer *n, std::slice s)
00050     : m_ContainerPointer(n), m_Pos(0), m_Slice(s) {}
00051 
00053   SliceIterator Begin()
00054     {
00055       SliceIterator ans = *this;
00056       ans.m_Pos = 0;
00057       return ans;
00058     }
00059   
00061   SliceIterator End()
00062     {
00063       SliceIterator ans = *this;
00064       ans.m_Pos = static_cast<unsigned long>(m_Slice.size());
00065       return ans;
00066     }
00067 
00069   SliceIterator operator++()
00070     {
00071       m_Pos++;
00072       return *this;
00073     }
00074 
00076   SliceIterator operator++(int)
00077     {
00078       SliceIterator ans  = *this;
00079       m_Pos++;
00080       return ans;
00081     }
00082 
00085   TPixel& operator[](unsigned long n)
00086     { return this->Loc(m_Pos=n); }
00087 
00090   TPixel& operator*()
00091     { return Loc(m_Pos); }
00092 
00095   bool operator==(const SliceIterator &orig)
00096     {
00097       return orig.m_Pos==this->m_Pos
00098         &&   orig.m_Slice.stride()==this->m_Slice.stride()
00099         &&   orig.m_Slice.start() ==this->m_Slice.start();
00100     }
00101   
00103   bool operator!=(const SliceIterator &orig)
00104     {
00105       return ! operator==(orig);
00106     }
00107 
00111   bool operator<(const SliceIterator &orig)
00112     {
00113       return this->m_Pos < orig.m_Pos
00114         &&   this->m_Slice.stride()==orig.m_Slice.stride()
00115         &&   this->m_Slice.start()==orig.m_Slice.start();
00116     }
00117   
00118 private:
00120   TPixel& Loc(unsigned long n) const
00121     {
00122       const unsigned long start  = static_cast<unsigned long>( m_Slice.start() );
00123       const unsigned long stride = static_cast<unsigned long>( m_Slice.stride() );
00124       return (*m_ContainerPointer)[ start + n * stride ];
00125     }  
00126 
00128   TContainer *m_ContainerPointer;
00129 
00131   unsigned long m_Pos;
00132 
00134   std::slice m_Slice;
00135 };
00136   
00137 } // end namespace itk
00138 
00139 #endif

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