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/*=========================================================================
Program: Insight Segmentation & Registration Toolkit
Module: itkNthElementPixelAccessor.h
Language: C++
Date: $Date$
Version: $Revision$
Copyright (c) Insight Software Consortium. All rights reserved.
See ITKCopyright.txt or http://www.itk.org/HTML/Copyright.htm for details.
This software is distributed WITHOUT ANY WARRANTY; without even
the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
PURPOSE. See the above copyright notices for more information.
=========================================================================*/
#ifndef __itkNthElementPixelAccessor_h
#define __itkNthElementPixelAccessor_h
#include "itkMacro.h"
namespace itk
{
/** \class NthElementPixelAccessor
* \brief Give access to the N-th of a Container type
*
* This class is intended to be used as parameter of
* an ImageAdaptor to make a Container appears as being
* of scalar type T, showing only the N-th component.
*
* This class is templated over the container type.
* Any container type that provides a method:
* operator[]( unsigned int ) can be used here,
* for example: itkPoint, itkVector, itkVectorContainer,
* and std::vector.
*
* For performance, no bound checking is performed during
* access to the n-th element.
*
* \sa ImageAdaptor
* \sa PixelAccessor
*
* \ingroup ImageAdaptors
*/
template < class T, class TContainer >
class ITK_EXPORT NthElementPixelAccessor
{
public:
/** Standard class typedefs. */
typedef NthElementPixelAccessor Self;
/** that this class will exhibit */
typedef T ExternalType;
/** Internal typedef. It defines the internal real
* representation of data */
typedef TContainer InternalType;
/** Write access to the NthElement component */
inline void Set( InternalType & output, const ExternalType & input ) const
{ output[m_ElementNumber] = input; }
/** Read access to the NthElement component */
inline ExternalType Get( const InternalType & input ) const
{ return static_cast<ExternalType>( input[m_ElementNumber] ); }
/** Get the element number to access in the container */
unsigned int GetElementNumber(void) const
{ return m_ElementNumber; }
/** Set the element number to access in the container */
void SetElementNumber( unsigned int nth )
{ m_ElementNumber = nth; }
/** operator!=. This is needed to convert a pixel accessor to a functor.
* \sa AdaptImageFilter */
bool operator!=(const Self& accessor) const
{
return (m_ElementNumber != accessor.m_ElementNumber);
}
/** Assignment operator */
NthElementPixelAccessor & operator=( const NthElementPixelAccessor & accessor )
{
m_ElementNumber = accessor.m_ElementNumber;
return *this;
}
/** Constructor */
NthElementPixelAccessor()
{
m_ElementNumber = 0;
}
private:
// Identifier of the N-th element to be accessed
unsigned int m_ElementNumber;
};
} // end namespace itk
#endif
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