ITK  4.1.0
Insight Segmentation and Registration Toolkit
itkNthElementPixelAccessor.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 __itkNthElementPixelAccessor_h
00019 #define __itkNthElementPixelAccessor_h
00020 
00021 #include "itkMacro.h"
00022 
00023 namespace itk
00024 {
00048 template< class T, class TContainer >
00049 class ITK_EXPORT NthElementPixelAccessor
00050 {
00051 public:
00053   typedef   NthElementPixelAccessor Self;
00054 
00056   typedef T ExternalType;
00057 
00060   typedef   TContainer InternalType;
00061 
00063   inline void Set(InternalType & output, const ExternalType & input) const
00064   { output[m_ElementNumber] =  input; }
00065 
00067   inline ExternalType Get(const InternalType & input) const
00068   { return static_cast< ExternalType >( input[m_ElementNumber] ); }
00069 
00071   unsigned int GetElementNumber(void) const
00072   { return m_ElementNumber; }
00073 
00075   void SetElementNumber(unsigned int nth)
00076   { m_ElementNumber = nth; }
00077 
00080   bool operator!=(const Self & accessor) const
00081   {
00082     return ( m_ElementNumber != accessor.m_ElementNumber );
00083   }
00084 
00086   NthElementPixelAccessor & operator=(const NthElementPixelAccessor & accessor)
00087   {
00088     m_ElementNumber = accessor.m_ElementNumber;
00089     return *this;
00090   }
00091 
00093   NthElementPixelAccessor()
00094   {
00095     m_ElementNumber = 0;
00096   }
00097 
00098 private:
00099   // Identifier of the N-th element to be accessed
00100   unsigned int m_ElementNumber;
00101 };
00102 }  // end namespace itk
00103 
00104 #endif
00105