itkCastImageFilter.h

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/*=========================================================================

  Program:   Insight Segmentation & Registration Toolkit
  Module:    $RCSfile: itkCastImageFilter.h,v $
  Language:  C++
  Date:      $Date: 2008-08-08 13:54:09 $
  Version:   $Revision: 1.15 $

  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 __itkCastImageFilter_h
#define __itkCastImageFilter_h

#include "itkUnaryFunctorImageFilter.h"
#include "itkProgressReporter.h"

namespace itk
{
  
namespace Functor {  
  
template< class TInput, class TOutput>
class Cast
{
public:
  Cast() {};
  virtual ~Cast() {};
  bool operator!=( const Cast & ) const
    {
    return false;
    }
  bool operator==( const Cast & other ) const
    {
    return !(*this != other);
    }
  inline TOutput operator()( const TInput & A )
    {
    return static_cast<TOutput>( A );
    }
};
}

template <class TInputImage, class TOutputImage>
class ITK_EXPORT CastImageFilter :
    public
UnaryFunctorImageFilter<TInputImage,TOutputImage, 
                        Functor::Cast< 
  typename TInputImage::PixelType, 
  typename TOutputImage::PixelType> >
{
public:
  typedef CastImageFilter               Self;
  typedef UnaryFunctorImageFilter<TInputImage,TOutputImage, 
                        Functor::Cast< 
                          typename TInputImage::PixelType, 
                          typename TOutputImage::PixelType>   
                                     >  Superclass;
  typedef SmartPointer<Self>            Pointer;
  typedef SmartPointer<const Self>      ConstPointer;

  itkNewMacro(Self);

  itkTypeMacro(CastImageFilter, UnaryFunctorImageFilter);

#ifdef ITK_USE_CONCEPT_CHECKING

  itkConceptMacro(InputConvertibleToOutputCheck,
    (Concept::Convertible<typename TInputImage::PixelType,
                          typename TOutputImage::PixelType>));

#endif

protected:
  CastImageFilter() {}
  virtual ~CastImageFilter() {}

  void GenerateData()
    {
    if( this->GetInPlace() && this->CanRunInPlace() )
      {
      // nothing to do, so avoid iterating over all the pixels
      // for nothing! Allocate the output, generate a fake progress and exit
      this->AllocateOutputs();
      ProgressReporter progress(this, 0, 1);
      return;
      }
    Superclass::GenerateData();
    }
  

  
private:
  CastImageFilter(const Self&); //purposely not implemented
  void operator=(const Self&); //purposely not implemented

};


} // end namespace itk

#endif

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