ITK  4.3.0
Insight Segmentation and Registration Toolkit
itkConstSliceIterator.h
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18 #ifndef __itkConstSliceIterator_h
19 #define __itkConstSliceIterator_h
20 
21 #include "itkMacro.h"
22 #include "itkIntTypes.h"
23 #include <valarray>
24 
25 namespace itk
26 {
50 template< class TPixel, class TContainer >
51 class ITK_EXPORT ConstSliceIterator
52 {
53 public:
54 
56  ConstSliceIterator(const TContainer *n, std::slice s):
57  m_ContainerPointer(n), m_Pos(0), m_Slice(s) {}
58 
61  {
62  ConstSliceIterator ans = *this;
63 
64  ans.m_Pos = 0;
65  return ans;
66  }
67 
71  {
72  ConstSliceIterator ans = *this;
73 
74  ans.m_Pos = static_cast< SizeValueType >( m_Slice.size() );
75  return ans;
76  }
77 
79  ConstSliceIterator operator++()
80  {
81  m_Pos++;
82  return *this;
83  }
84 
86  ConstSliceIterator operator++(int)
87  {
88  ConstSliceIterator ans = *this;
89 
90  m_Pos++;
91  return ans;
92  }
93 
96  const TPixel & operator[](SizeValueType n)
97  {
98  return this->Loc(m_Pos = n);
99  }
100 
103  const TPixel & operator*()
104  {
105  return Loc(m_Pos);
106  }
107 
110  bool operator==(const ConstSliceIterator & orig)
111  {
112  return orig.m_Pos == this->m_Pos
113  && orig.m_Slice.stride() == this->m_Slice.stride()
114  && orig.m_Slice.start() == this->m_Slice.start();
115  }
116 
118  bool operator!=(const ConstSliceIterator & orig)
119  {
120  return !operator==(orig);
121  }
122 
126  bool operator<(const ConstSliceIterator & orig)
127  {
128  return this->m_Pos < orig.m_Pos
129  && this->m_Slice.stride() == orig.m_Slice.stride()
130  && this->m_Slice.start() == orig.m_Slice.start();
131  }
132 
133 private:
135  const TPixel & Loc(SizeValueType n) const
136  {
137  return ( *m_ContainerPointer )[static_cast< SizeValueType >( m_Slice.start() + n * m_Slice.stride())];
138  }
139 
141  const TContainer *m_ContainerPointer;
142 
145 
147  std::slice m_Slice;
148 };
149 } // end namespace itk
150 
151 #endif
152