ITK  4.1.0
Insight Segmentation and Registration Toolkit
itkConstSliceIterator.h
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00001 /*=========================================================================
00002  *
00003  *  Copyright Insight Software Consortium
00004  *
00005  *  Licensed under the Apache License, Version 2.0 (the "License");
00006  *  you may not use this file except in compliance with the License.
00007  *  You may obtain a copy of the License at
00008  *
00009  *         http://www.apache.org/licenses/LICENSE-2.0.txt
00010  *
00011  *  Unless required by applicable law or agreed to in writing, software
00012  *  distributed under the License is distributed on an "AS IS" BASIS,
00013  *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
00014  *  See the License for the specific language governing permissions and
00015  *  limitations under the License.
00016  *
00017  *=========================================================================*/
00018 #ifndef __itkConstSliceIterator_h
00019 #define __itkConstSliceIterator_h
00020 
00021 #include "itkMacro.h"
00022 #include "itkIntTypes.h"
00023 #include <valarray>
00024 
00025 namespace itk
00026 {
00050 template< class TPixel, class TContainer >
00051 class ITK_EXPORT ConstSliceIterator
00052 {
00053 public:
00054 
00056   ConstSliceIterator(const TContainer *n, std::slice s):
00057     m_ContainerPointer(n), m_Pos(0), m_Slice(s) {}
00058 
00060   ConstSliceIterator Begin()
00061   {
00062     ConstSliceIterator ans = *this;
00063 
00064     ans.m_Pos = 0;
00065     return ans;
00066   }
00067 
00070   ConstSliceIterator End()
00071   {
00072     ConstSliceIterator ans = *this;
00073 
00074     ans.m_Pos = static_cast< SizeValueType >( m_Slice.size() );
00075     return ans;
00076   }
00077 
00079   ConstSliceIterator operator++()
00080   {
00081     m_Pos++;
00082     return *this;
00083   }
00084 
00086   ConstSliceIterator operator++(int)
00087   {
00088     ConstSliceIterator ans  = *this;
00089 
00090     m_Pos++;
00091     return ans;
00092   }
00093 
00096   const TPixel & operator[](SizeValueType n)
00097   {
00098     return this->Loc(m_Pos = n);
00099   }
00100 
00103   const TPixel & operator*()
00104   {
00105     return Loc(m_Pos);
00106   }
00107 
00110   bool operator==(const ConstSliceIterator & orig)
00111   {
00112     return orig.m_Pos == this->m_Pos
00113            &&   orig.m_Slice.stride() == this->m_Slice.stride()
00114            &&   orig.m_Slice.start() == this->m_Slice.start();
00115   }
00116 
00118   bool operator!=(const ConstSliceIterator & orig)
00119   {
00120     return !operator==(orig);
00121   }
00122 
00126   bool operator<(const ConstSliceIterator & orig)
00127   {
00128     return this->m_Pos < orig.m_Pos
00129            &&   this->m_Slice.stride() == orig.m_Slice.stride()
00130            &&   this->m_Slice.start() == orig.m_Slice.start();
00131   }
00132 
00133 private:
00135   const TPixel & Loc(SizeValueType n) const
00136   {
00137     return ( *m_ContainerPointer )[static_cast< SizeValueType >( m_Slice.start() + n * m_Slice.stride())];
00138   }
00139 
00141   const TContainer *m_ContainerPointer;
00142 
00144   SizeValueType m_Pos;
00145 
00147   std::slice m_Slice;
00148 };
00149 } // end namespace itk
00150 
00151 #endif
00152