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/*========================================================================= |
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Program: Insight Segmentation & Registration Toolkit |
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Module: $RCSfile: itkConstSliceIterator.h.html,v $ |
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Language: C++ |
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Date: $Date: 2006/01/17 19:15:34 $ |
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Version: $Revision: 1.4 $ |
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Copyright (c) Insight Software Consortium. All rights reserved. |
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See ITKCopyright.txt or http://www.itk.org/HTML/Copyright.htm for details. |
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This software is distributed WITHOUT ANY WARRANTY; without even |
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the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR |
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PURPOSE. See the above copyright notices for more information. |
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=========================================================================*/ |
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#ifndef __itkConstSliceIterator_h |
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#define __itkConstSliceIterator_h |
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#include "itkMacro.h" |
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#include "itkExceptionObject.h" |
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#include <valarray> |
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namespace itk { |
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/** |
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* \class ConstSliceIterator |
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* \brief A flexible iterator for itk containers(i.e. itk::Neighborhood) |
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* that support pixel access through operator[]. |
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* |
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* ConstSliceIterator allows const iteration along a std::slice through the |
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* container. |
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* A slice is a construct that defines a starting position, stride length |
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* (distance between adjacent elements), and a length. |
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* |
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* Any container with operator[] const is supported. Because it uses this |
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* interface the iterator is only as efficient as the implementation of a |
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* container's operator[] method. |
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* |
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* References: |
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* Modeled after a slice iterator proposed by Bjarne Stroustrup |
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* in C++ Programming Language, Third Edition. Bjarne Stroustrup. Addison |
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* Wesley, Reading, MA. 1997. |
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* |
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* \ingroup Iterators |
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* |
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*/ |
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template<class TPixel, class TContainer> |
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class ITK_EXPORT ConstSliceIterator |
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{ |
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public: |
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/** Constructor. */ |
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ConstSliceIterator(const TContainer *n, std::slice s) |
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****: m_ContainerPointer(n), m_Pos(0), m_Slice(s) {} |
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/** Returns a ConstSliceIterator that points to the beginning of the slice. */ |
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ConstSliceIterator Begin() |
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**{ |
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ConstSliceIterator ans = *this; |
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ans.m_Pos = 0; |
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return ans; |
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**} |
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/** Returns a ConstSliceIterator that points to one past the end of the slice. */ |
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ConstSliceIterator End() |
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**{ |
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ConstSliceIterator ans = *this; |
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ans.m_Pos = m_Slice.size(); |
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return ans; |
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**} |
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/** Increments the iterator. */ |
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ConstSliceIterator operator++() |
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**{ |
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m_Pos++; |
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return *this; |
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**} |
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/** Increments the iterator. */ |
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ConstSliceIterator operator++(int) |
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**{ |
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ConstSliceIterator ans = *this; |
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m_Pos++; |
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return ans; |
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**} |
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/** Returns the element at position n of the slice. Sets the |
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* iterator to point to position n. */ |
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const TPixel& operator[](unsigned long n) |
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**{ |
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return this->Loc(m_Pos=n); |
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**} |
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/** Dereferences the iterator, returning the value that it points |
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* to. */ |
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const TPixel& operator*() |
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**{ |
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return Loc(m_Pos); |
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**} |
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/** Returns the logical && of the boolean == of two slice iterator positions, |
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* stride, and start locations. */ |
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bool operator==(const ConstSliceIterator &orig) |
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**{ |
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return orig.m_Pos==this->m_Pos |
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******&& orig.m_Slice.stride()==this->m_Slice.stride() |
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******&& orig.m_Slice.start() ==this->m_Slice.start(); |
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**} |
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/** Returns the logical inverse of the boolean == of two slice iterators. */ |
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bool operator!=(const ConstSliceIterator &orig) |
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**{ |
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return ! operator==(orig); |
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**} |
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/** Returns the boolean < of two slice iterator positions. Result |
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* is only true if the slice iterators have the same stride and |
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* start location. */ |
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bool operator<(const ConstSliceIterator &orig) |
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{ |
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return this->m_Pos < orig.m_Pos |
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&& this->m_Slice.stride()==orig.m_Slice.stride() |
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******&& this->m_Slice.start()==orig.m_Slice.start(); |
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**} |
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private: |
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/** Returns the value located at position n of the slice. */ |
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const TPixel& Loc(unsigned long n) const |
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**{ |
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return (*m_ContainerPointer)[m_Slice.start() |
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***************************************+ n * m_Slice.stride()]; |
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**} |
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/** Pointer to the container referenced by the slice iterator. */ |
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const TContainer *m_ContainerPointer; |
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/** Current position within the slice. */ |
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unsigned long m_Pos; |
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/** Slice structure information. */ |
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std::slice m_Slice; |
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}; |
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} // end namespace itk |
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#endif |
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