itkNaryMaximumImageFilter.h

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/*=========================================================================
 *
 *  Copyright NumFOCUS
 *
 *  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
 *
 *         https://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"
#include <algorithm> // For max.
 
namespace itk
{
namespace Functor
{
template <typename TInput, typename TOutput>
class Maximum1
{
public:
  using OutputValueType = typename NumericTraits<TOutput>::ValueType;
  // not sure if this type alias really makes things more clear... could just use
  // TOutput?
 
  inline TOutput
  operator()(const std::vector<TInput> & B) const
  {
    OutputValueType A = NumericTraits<TOutput>::NonpositiveMin();
 
    for (unsigned int i = 0; i < B.size(); ++i)
    {
      A = std::max(A, static_cast<OutputValueType>(B[i]));
    }
    return A;
  }
 
  bool
  operator==(const Maximum1 &) const
  {
    return true;
  }
 
  ITK_UNEQUAL_OPERATOR_MEMBER_FUNCTION(Maximum1);
};
} // namespace Functor

template <typename TInputImage, typename TOutputImage>
class NaryMaximumImageFilter
  : public NaryFunctorImageFilter<TInputImage,
                                  TOutputImage,
                                  Functor::Maximum1<typename TInputImage::PixelType, typename TInputImage::PixelType>>
{
public:
  ITK_DISALLOW_COPY_AND_MOVE(NaryMaximumImageFilter);

  using Self = NaryMaximumImageFilter;
  using Superclass =
    NaryFunctorImageFilter<TInputImage,
                           TOutputImage,
                           Functor::Maximum1<typename TInputImage::PixelType, typename TInputImage::PixelType>>;
 
  using Pointer = SmartPointer<Self>;
  using ConstPointer = SmartPointer<const Self>;

  itkNewMacro(Self);

  itkOverrideGetNameOfClassMacro(NaryMaximumImageFilter);
 
  itkConceptMacro(InputConvertibleToOutputCheck,
                  (Concept::Convertible<typename TInputImage::PixelType, typename TOutputImage::PixelType>));
  itkConceptMacro(InputLessThanComparableCheck, (Concept::LessThanComparable<typename TInputImage::PixelType>));
  itkConceptMacro(InputHasNumericTraitsCheck, (Concept::HasNumericTraits<typename TInputImage::PixelType>));
 
protected:
  NaryMaximumImageFilter() = default;
  ~NaryMaximumImageFilter() override = default;
};
} // end namespace itk
 
#endif