itkNaryMaximumImageFilter.h

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/*=========================================================================
 *
 *  Copyright Insight Software Consortium
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *         http://www.apache.org/licenses/LICENSE-2.0.txt
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 *
 *=========================================================================*/
#ifndef itkNaryMaximumImageFilter_h
#define itkNaryMaximumImageFilter_h

#include "itkNaryFunctorImageFilter.h"
#include "itkNumericTraits.h"

namespace itk
{
namespace Functor
{
template< typename TInput, typename TOutput >
class Maximum1
{
public:
  typedef typename NumericTraits< TOutput >::ValueType OutputValueType;
  // not sure if this typedef really makes things more clear... could just use
  // TOutput?

  Maximum1() {}
  ~Maximum1() {}
  inline TOutput operator()(const std::vector< TInput > & B) const
  {
    OutputValueType A = NumericTraits< TOutput >::NonpositiveMin();

    for ( unsigned int i = 0; i < B.size(); i++ )
      {
      if ( A < static_cast< OutputValueType >( B[i] ) )
        {
        A = static_cast< OutputValueType >( B[i] );
        }
      }
    return A;
  }

  bool operator==(const Maximum1 &) const
  {
    return true;
  }

  bool operator!=(const Maximum1 &) const
  {
    return false;
  }
};
}
template< typename TInputImage, typename TOutputImage >
class NaryMaximumImageFilter:
  public
  NaryFunctorImageFilter< TInputImage, TOutputImage,
                          Functor::Maximum1<  typename TInputImage::PixelType,
                                              typename TInputImage::PixelType > >
{
public:
  typedef NaryMaximumImageFilter Self;
  typedef NaryFunctorImageFilter<
    TInputImage, TOutputImage,
    Functor::Maximum1< typename TInputImage::PixelType,
                       typename TInputImage::PixelType > > Superclass;

  typedef SmartPointer< Self >       Pointer;
  typedef SmartPointer< const Self > ConstPointer;

  itkNewMacro(Self);

  itkTypeMacro(NaryMaximumImageFilter,
               NaryFunctorImageFilter);

#ifdef ITK_USE_CONCEPT_CHECKING
  // Begin concept checking
  itkConceptMacro( InputConvertibleToOutputCheck,
                   ( Concept::Convertible< typename TInputImage::PixelType,
                                           typename TOutputImage::PixelType > ) );
  itkConceptMacro( InputLessThanComparableCheck,
                   ( Concept::LessThanComparable< typename TInputImage::PixelType > ) );
  itkConceptMacro( InputHasNumericTraitsCheck,
                   ( Concept::HasNumericTraits< typename TInputImage::PixelType > ) );
  // End concept checking
#endif

protected:
  NaryMaximumImageFilter() {}
  virtual ~NaryMaximumImageFilter() ITK_OVERRIDE {}

private:
  ITK_DISALLOW_COPY_AND_ASSIGN(NaryMaximumImageFilter);
};
} // end namespace itk

#endif