itkMinimumImageFilter.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 itkMinimumImageFilter_h
#define itkMinimumImageFilter_h
 
#include "itkBinaryGeneratorImageFilter.h"
 
namespace itk
{
namespace Functor
{
template <typename TInput1, typename TInput2 = TInput1, typename TOutput = TInput1>
class Minimum
{
public:
  bool
  operator==(const Minimum &) const
  {
    return true;
  }
 
  ITK_UNEQUAL_OPERATOR_MEMBER_FUNCTION(Minimum);
 
  inline TOutput
  operator()(const TInput1 & A, const TInput2 & B) const
  {
    return static_cast<TOutput>((A < B) ? A : B);
  }
};
} // namespace Functor

template <typename TInputImage1, typename TInputImage2 = TInputImage1, typename TOutputImage = TInputImage1>
class ITK_TEMPLATE_EXPORT MinimumImageFilter
  : public BinaryGeneratorImageFilter<TInputImage1, TInputImage2, TOutputImage>
{
public:
  ITK_DISALLOW_COPY_AND_MOVE(MinimumImageFilter);

  using Self = MinimumImageFilter;
  using Superclass = BinaryGeneratorImageFilter<TInputImage1, TInputImage2, TOutputImage>;
 
  using Pointer = SmartPointer<Self>;
  using ConstPointer = SmartPointer<const Self>;
  using FunctorType = Functor::
    Minimum<typename TInputImage1::PixelType, typename TInputImage2::PixelType, typename TOutputImage::PixelType>;

  itkNewMacro(Self);

  itkOverrideGetNameOfClassMacro(MinimumImageFilter);
 
  itkConceptMacro(Input1ConvertibleToInput2Check,
                  (Concept::Convertible<typename TInputImage1::PixelType, typename TInputImage2::PixelType>));
  itkConceptMacro(Input2ConvertibleToOutputCheck,
                  (Concept::Convertible<typename TInputImage2::PixelType, typename TOutputImage::PixelType>));
  itkConceptMacro(Input1LessThanInput2Check,
                  (Concept::LessThanComparable<typename TInputImage1::PixelType, typename TInputImage2::PixelType>));
 
protected:
  MinimumImageFilter()
  {
#if !defined(ITK_WRAPPING_PARSER)
    Superclass::SetFunctor(FunctorType());
#endif
  }
 
  ~MinimumImageFilter() override = default;
};
} // end namespace itk
 
#endif