text: /*=========================================================================
   *
   *  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
   *
   *         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 itkMeanSquaresImageToImageMetricv4_h
  #define itkMeanSquaresImageToImageMetricv4_h
  
  #include "itkImageToImageMetricv4.h"
  #include "itkMeanSquaresImageToImageMetricv4GetValueAndDerivativeThreader.h"
  #include "itkDefaultImageToImageMetricTraitsv4.h"
  
  namespace itk
  {
  
  /** \class MeanSquaresImageToImageMetricv4
   *
   *  \brief Class implementing a mean squares metric.
   *
   *  This class supports vector images of type VectorImage
   *  and Image< VectorType, imageDimension >.
   *
   *  See
   *  MeanSquaresImageToImageMetricv4GetValueAndDerivativeThreader::ProcessPoint for algorithm implementation.
   *
   * \ingroup ITKMetricsv4
   */
  template <typename TFixedImage,
            typename TMovingImage,
            typename TVirtualImage = TFixedImage,
            typename TInternalComputationValueType = double,
            typename TMetricTraits =
              DefaultImageToImageMetricTraitsv4<TFixedImage, TMovingImage, TVirtualImage, TInternalComputationValueType>>
  class ITK_TEMPLATE_EXPORT MeanSquaresImageToImageMetricv4
    : public ImageToImageMetricv4<TFixedImage, TMovingImage, TVirtualImage, TInternalComputationValueType, TMetricTraits>
  {
  public:
    ITK_DISALLOW_COPY_AND_MOVE(MeanSquaresImageToImageMetricv4);
  
    /** Standard class type aliases. */
    using Self = MeanSquaresImageToImageMetricv4;
    using Superclass =
      ImageToImageMetricv4<TFixedImage, TMovingImage, TVirtualImage, TInternalComputationValueType, TMetricTraits>;
    using Pointer = SmartPointer<Self>;
    using ConstPointer = SmartPointer<const Self>;
  
    /** Method for creation through the object factory. */
    itkNewMacro(Self);
  
    /** Run-time type information (and related methods). */
    itkTypeMacro(MeanSquaresImageToImageMetricv4, ImageToImageMetricv4);
  
    using DerivativeType = typename Superclass::DerivativeType;
  
    using FixedImagePointType = typename Superclass::FixedImagePointType;
    using FixedImagePixelType = typename Superclass::FixedImagePixelType;
    using FixedImageGradientType = typename Superclass::FixedImageGradientType;
  
    using MovingImagePointType = typename Superclass::MovingImagePointType;
    using MovingImagePixelType = typename Superclass::MovingImagePixelType;
    using MovingImageGradientType = typename Superclass::MovingImageGradientType;
  
    using MovingTransformType = typename Superclass::MovingTransformType;
    using JacobianType = typename Superclass::JacobianType;
    using VirtualImageType = typename Superclass::VirtualImageType;
    using VirtualIndexType = typename Superclass::VirtualIndexType;
    using VirtualPointType = typename Superclass::VirtualPointType;
    using VirtualPointSetType = typename Superclass::VirtualPointSetType;
  
    /* Image dimension accessors */
    static constexpr typename TVirtualImage::ImageDimensionType VirtualImageDimension = TVirtualImage::ImageDimension;
    static constexpr typename TFixedImage::ImageDimensionType   FixedImageDimension = TFixedImage::ImageDimension;
    static constexpr typename TMovingImage::ImageDimensionType  MovingImageDimension = TMovingImage::ImageDimension;
  
  protected:
    MeanSquaresImageToImageMetricv4();
    ~MeanSquaresImageToImageMetricv4() override = default;
  
    friend class MeanSquaresImageToImageMetricv4GetValueAndDerivativeThreader<
      ThreadedImageRegionPartitioner<Superclass::VirtualImageDimension>,
      Superclass,
      Self>;
    friend class MeanSquaresImageToImageMetricv4GetValueAndDerivativeThreader<ThreadedIndexedContainerPartitioner,
                                                                              Superclass,
                                                                              Self>;
    using MeanSquaresDenseGetValueAndDerivativeThreaderType =
      MeanSquaresImageToImageMetricv4GetValueAndDerivativeThreader<
        ThreadedImageRegionPartitioner<Superclass::VirtualImageDimension>,
        Superclass,
        Self>;
    using MeanSquaresSparseGetValueAndDerivativeThreaderType =
      MeanSquaresImageToImageMetricv4GetValueAndDerivativeThreader<ThreadedIndexedContainerPartitioner, Superclass, Self>;
  
    void
    PrintSelf(std::ostream & os, Indent indent) const override;
  };
  
  } // end namespace itk
  
  #ifndef ITK_MANUAL_INSTANTIATION
  #  include "itkMeanSquaresImageToImageMetricv4.hxx"
  #endif
  
  #endif
  