STYLE: Finalize ITKv5 const function API change

The non-const API variants are no longer supported
at compiletime.

Replace 'ITKv5_CONST' with 'const'.

Documentation/docs/migration_guides/itk_6_migration_guide.md

@@ -21,3 +21,11 @@ re-flagged as `ITK_LEGACY_REMOVE`. There have been some other
 deprecations and API changes. The new behavior is activated by setting
 `ITK_LEGACY_REMOVE` to `ON`. By default, compatibility with v5 is retained
 (`ITK_LEGACY_REMOVE=OFF`).
+
+
+Require modern C++ language feature use
+---------------------------------------
+
+Many backward compatible/ forward enabling compiler features are now required to be used.
+
+Replace `ITKv5_CONST` with `const`

Modules/Core/Common/include/itkImageSink.h

@@ -158,7 +158,7 @@ class ImageSink
   {}
 
   void
-  VerifyInputInformation() ITKv5_CONST override;
+  VerifyInputInformation() const override;
 
   void
   BeforeStreamedGenerateData() override

Modules/Core/Common/include/itkImageSink.hxx

@@ -167,7 +167,7 @@ ImageSink<TInputImage>::GenerateNthInputRequestedRegion(unsigned int inputReques
 
 template <typename TInputImage>
 void
-ImageSink<TInputImage>::VerifyInputInformation() ITKv5_CONST
+ImageSink<TInputImage>::VerifyInputInformation() const
 {
   using ImageBaseType = const ImageBase<InputImageDimension>;
 

Modules/Core/Common/include/itkImageToImageFilter.h

@@ -244,7 +244,7 @@ class ITK_TEMPLATE_EXPORT ImageToImageFilter
    * \sa ProcessObject::VerifyInputInformation
    */
   void
-  VerifyInputInformation() ITKv5_CONST override;
+  VerifyInputInformation() const override;
 
   /** What is the input requested region that is required to produce
    * the output requested region? The base assumption for image

Modules/Core/Common/include/itkImageToImageFilter.hxx

@@ -145,7 +145,7 @@ ImageToImageFilter<TInputImage, TOutputImage>::PrintSelf(std::ostream & os, Inde
 
 template <typename TInputImage, typename TOutputImage>
 void
-ImageToImageFilter<TInputImage, TOutputImage>::VerifyInputInformation() ITKv5_CONST
+ImageToImageFilter<TInputImage, TOutputImage>::VerifyInputInformation() const
 {
 
   using ImageBaseType = const ImageBase<InputImageDimension>;

Modules/Core/Common/include/itkMacro.h

@@ -1373,11 +1373,11 @@ compilers.
 #  define ITK_ITERATOR_FINAL
 #endif
 
-#if defined(ITKV4_COMPATIBILITY)
-// A macro for methods which are const in ITKv5, but not in ITKv4
-#  define ITKv5_CONST
+#if defined(ITK_LEGACY_REMOVE)
+// A macro for methods which are const in ITKv5 and ITKv6 require const for functions
+#  define ITKv5_CONST static_assert(false, "ERROR: ITKv5_CONST must be replaced with 'const'")
 #else
-// A macro for methods which are const in ITKv5, but not in ITKv4
+// A macro for methods which are const in after ITKv4
 #  define ITKv5_CONST const
 #endif
 

Modules/Core/Common/include/itkProcessObject.h

@@ -788,7 +788,7 @@ class ITKCommon_EXPORT ProcessObject : public Object
    *
    */
   virtual void
-  VerifyPreconditions() ITKv5_CONST;
+  VerifyPreconditions() const;
 
   /** \brief Verifies that the inputs meta-data is consistent and valid
    * for continued execution of the pipeline, throws an exception if
@@ -801,7 +801,7 @@ class ITKCommon_EXPORT ProcessObject : public Object
    *
    */
   virtual void
-  VerifyInputInformation() ITKv5_CONST;
+  VerifyInputInformation() const;
 
   /** What is the input requested region that is required to produce the
    * output requested region? By default, the largest possible region is

Modules/Core/Common/src/itkProcessObject.cxx

@@ -1327,7 +1327,7 @@ ProcessObject::PropagateResetPipeline()
 
 
 void
-ProcessObject::VerifyPreconditions() ITKv5_CONST
+ProcessObject::VerifyPreconditions() const
 {
   /**
    * Make sure that all the required named inputs are there and non null
@@ -1356,7 +1356,7 @@ ProcessObject::VerifyPreconditions() ITKv5_CONST
 
 
 void
-ProcessObject::VerifyInputInformation() ITKv5_CONST
+ProcessObject::VerifyInputInformation() const
 {}
 
 

Modules/Core/TestKernel/include/itkTestingComparisonImageFilter.h

@@ -135,7 +135,7 @@ class ITK_TEMPLATE_EXPORT ComparisonImageFilter : public ImageToImageFilter<TInp
   AfterThreadedGenerateData() override;
 
   void
-  VerifyInputInformation() ITKv5_CONST override;
+  VerifyInputInformation() const override;
 
   OutputPixelType m_DifferenceThreshold{};
 

Modules/Core/TestKernel/include/itkTestingComparisonImageFilter.hxx

@@ -265,7 +265,7 @@ ComparisonImageFilter<TInputImage, TOutputImage>::AfterThreadedGenerateData()
 
 template <typename TInputImage, typename TOutputImage>
 void
-ComparisonImageFilter<TInputImage, TOutputImage>::VerifyInputInformation() ITKv5_CONST
+ComparisonImageFilter<TInputImage, TOutputImage>::VerifyInputInformation() const
 {
   if (m_VerifyInputInformation)
   {

Modules/Core/Transform/include/itkTransformGeometryImageFilter.h

@@ -155,7 +155,7 @@ class ITK_TEMPLATE_EXPORT TransformGeometryImageFilter : public InPlaceImageFilt
   GenerateOutputInformation() override;
 
   void
-  VerifyPreconditions() ITKv5_CONST override;
+  VerifyPreconditions() const override;
 
   void
   GenerateData() override;

Modules/Core/Transform/include/itkTransformGeometryImageFilter.hxx

@@ -36,7 +36,7 @@ TransformGeometryImageFilter<TInputImage, TOutputImage>::TransformGeometryImageF
 
 template <typename TInputImage, typename TOutputImage>
 void
-TransformGeometryImageFilter<TInputImage, TOutputImage>::VerifyPreconditions() ITKv5_CONST
+TransformGeometryImageFilter<TInputImage, TOutputImage>::VerifyPreconditions() const
 {
   Superclass::VerifyPreconditions();
 

Modules/Filtering/Convolution/include/itkConvolutionImageFilterBase.h

@@ -154,7 +154,7 @@ class ITK_TEMPLATE_EXPORT ConvolutionImageFilterBase : public ImageToImageFilter
   /** Default superclass implementation ensures that input images
    * occupy same physical space. This is not needed for this filter. */
   void
-  VerifyInputInformation() ITKv5_CONST override{};
+  VerifyInputInformation() const override{};
 
 private:
   bool m_Normalize{ false };

Modules/Filtering/Convolution/include/itkMaskedFFTNormalizedCorrelationImageFilter.h

@@ -248,7 +248,7 @@ class ITK_TEMPLATE_EXPORT MaskedFFTNormalizedCorrelationImageFilter
 
   /** Overlap the VerifyInputInformation method */
   void
-  VerifyInputInformation() ITKv5_CONST override;
+  VerifyInputInformation() const override;
 
   /** Standard pipeline method.*/
   void

Modules/Filtering/Convolution/include/itkMaskedFFTNormalizedCorrelationImageFilter.hxx

@@ -600,7 +600,7 @@ MaskedFFTNormalizedCorrelationImageFilter<TInputImage, TOutputImage, TMaskImage>
 
 template <typename TInputImage, typename TOutputImage, typename TMaskImage>
 void
-MaskedFFTNormalizedCorrelationImageFilter<TInputImage, TOutputImage, TMaskImage>::VerifyInputInformation() ITKv5_CONST
+MaskedFFTNormalizedCorrelationImageFilter<TInputImage, TOutputImage, TMaskImage>::VerifyInputInformation() const
 {
   // Call the superclass' implementation of this method.
   Superclass::VerifyInputInformation();

Modules/Filtering/DiffusionTensorImage/include/itkDiffusionTensor3DReconstructionImageFilter.h

@@ -312,7 +312,7 @@ class ITK_TEMPLATE_EXPORT DiffusionTensor3DReconstructionImageFilter
   DynamicThreadedGenerateData(const OutputImageRegionType & outputRegionForThread) override;
 
   void
-  VerifyPreconditions() ITKv5_CONST override;
+  VerifyPreconditions() const override;
 
   /** Enables backwards compatibility for enum values */
   using GradientImageTypeEnumeration = DiffusionTensor3DReconstructionImageFilterEnums::GradientImageFormat;

Modules/Filtering/DiffusionTensorImage/include/itkDiffusionTensor3DReconstructionImageFilter.hxx

@@ -642,7 +642,7 @@ void
 DiffusionTensor3DReconstructionImageFilter<TReferenceImagePixelType,
                                            TGradientImagePixelType,
                                            TTensorPixelType,
-                                           TMaskImageType>::VerifyPreconditions() ITKv5_CONST
+                                           TMaskImageType>::VerifyPreconditions() const
 {
   Superclass::VerifyPreconditions();
 

Modules/Filtering/FastMarching/include/itkFastMarchingUpwindGradientImageFilter.h

@@ -246,7 +246,7 @@ class ITK_TEMPLATE_EXPORT FastMarchingUpwindGradientImageFilter : public FastMar
   PrintSelf(std::ostream & os, Indent indent) const override;
 
   virtual void
-  VerifyPreconditions() ITKv5_CONST override;
+  VerifyPreconditions() const override;
 
   void
   Initialize(LevelSetImageType *) override;

Modules/Filtering/FastMarching/include/itkFastMarchingUpwindGradientImageFilter.hxx

@@ -60,7 +60,7 @@ FastMarchingUpwindGradientImageFilter<TLevelSet, TSpeedImage>::PrintSelf(std::os
 
 template <typename TLevelSet, typename TSpeedImage>
 void
-FastMarchingUpwindGradientImageFilter<TLevelSet, TSpeedImage>::VerifyPreconditions() ITKv5_CONST
+FastMarchingUpwindGradientImageFilter<TLevelSet, TSpeedImage>::VerifyPreconditions() const
 {
   Superclass::VerifyPreconditions();
 

Modules/Filtering/ImageCompose/include/itkJoinSeriesImageFilter.h

@@ -104,7 +104,7 @@ class ITK_TEMPLATE_EXPORT JoinSeriesImageFilter : public ImageToImageFilter<TInp
    * \sa ProcessObject::VerifyInputInformation
    */
   void
-  VerifyInputInformation() ITKv5_CONST override;
+  VerifyInputInformation() const override;
 
   /** Overrides GenerateOutputInformation() in order to produce
    * an image which has a different information than the first input.

Modules/Filtering/ImageCompose/include/itkJoinSeriesImageFilter.hxx

@@ -34,7 +34,7 @@ JoinSeriesImageFilter<TInputImage, TOutputImage>::JoinSeriesImageFilter()
 
 template <typename TInputImage, typename TOutputImage>
 void
-JoinSeriesImageFilter<TInputImage, TOutputImage>::VerifyInputInformation() ITKv5_CONST
+JoinSeriesImageFilter<TInputImage, TOutputImage>::VerifyInputInformation() const
 {
 
   Superclass::VerifyInputInformation();

Modules/Filtering/ImageFeature/include/itkHessianToObjectnessMeasureImageFilter.h

@@ -135,7 +135,7 @@ class ITK_TEMPLATE_EXPORT HessianToObjectnessMeasureImageFilter : public ImageTo
   PrintSelf(std::ostream & os, Indent indent) const override;
 
   void
-  VerifyPreconditions() ITKv5_CONST override;
+  VerifyPreconditions() const override;
 
   void
   DynamicThreadedGenerateData(const OutputImageRegionType & outputRegionForThread) override;

Modules/Filtering/ImageFeature/include/itkHessianToObjectnessMeasureImageFilter.hxx

@@ -40,7 +40,7 @@ HessianToObjectnessMeasureImageFilter<TInputImage, TOutputImage>::HessianToObjec
 
 template <typename TInputImage, typename TOutputImage>
 void
-HessianToObjectnessMeasureImageFilter<TInputImage, TOutputImage>::VerifyPreconditions() ITKv5_CONST
+HessianToObjectnessMeasureImageFilter<TInputImage, TOutputImage>::VerifyPreconditions() const
 {
   Superclass::VerifyPreconditions();
   if (m_ObjectDimension >= ImageDimension)

Modules/Filtering/ImageFeature/include/itkHoughTransform2DCirclesImageFilter.h

@@ -107,7 +107,7 @@ class ITK_TEMPLATE_EXPORT HoughTransform2DCirclesImageFilter
 
   /** Verifies the preconditions of this filter. */
   void
-  VerifyPreconditions() ITKv5_CONST override;
+  VerifyPreconditions() const override;
 
   /** Method for evaluating the implicit function over the image. */
   void

Modules/Filtering/ImageFeature/include/itkHoughTransform2DCirclesImageFilter.hxx

@@ -65,8 +65,7 @@ HoughTransform2DCirclesImageFilter<TInputPixelType, TOutputPixelType, TRadiusPix
 
 template <typename TInputPixelType, typename TOutputPixelType, typename TRadiusPixelType>
 void
-HoughTransform2DCirclesImageFilter<TInputPixelType, TOutputPixelType, TRadiusPixelType>::VerifyPreconditions()
-  ITKv5_CONST
+HoughTransform2DCirclesImageFilter<TInputPixelType, TOutputPixelType, TRadiusPixelType>::VerifyPreconditions() const
 {
   Superclass::VerifyPreconditions();
 

Modules/Filtering/ImageFeature/include/itkUnsharpMaskImageFilter.h

@@ -155,7 +155,7 @@ class ITK_TEMPLATE_EXPORT UnsharpMaskImageFilter : public ImageToImageFilter<TIn
   GenerateInputRequestedRegion() override;
 
   void
-  VerifyPreconditions() ITKv5_CONST override;
+  VerifyPreconditions() const override;
   void
   GenerateData() override;
 

Modules/Filtering/ImageFeature/include/itkUnsharpMaskImageFilter.hxx

@@ -56,7 +56,7 @@ UnsharpMaskImageFilter<TInputImage, TOutputImage, TInternalPrecision>::GenerateI
 
 template <typename TInputImage, typename TOutputImage, typename TInternalPrecision>
 void
-UnsharpMaskImageFilter<TInputImage, TOutputImage, TInternalPrecision>::VerifyPreconditions() ITKv5_CONST
+UnsharpMaskImageFilter<TInputImage, TOutputImage, TInternalPrecision>::VerifyPreconditions() const
 {
   Superclass::VerifyPreconditions();
   if (m_Threshold < 0.0)

Modules/Filtering/ImageFrequency/include/itkFrequencyBandImageFilter.h

@@ -188,7 +188,7 @@ class ITK_TEMPLATE_EXPORT FrequencyBandImageFilter : public UnaryFrequencyDomain
 
   /* Checks the logic of FrequencyThresholds. */
   void
-  VerifyPreconditions() ITKv5_CONST override;
+  VerifyPreconditions() const override;
 
   /* This is the box functor, which implements the filter's behavior. */
   void

Modules/Filtering/ImageFrequency/include/itkFrequencyBandImageFilter.hxx

@@ -111,7 +111,7 @@ FrequencyBandImageFilter<TImageType, TFrequencyIterator>::SetFrequencyThresholds
 
 template <typename TImageType, typename TFrequencyIterator>
 void
-FrequencyBandImageFilter<TImageType, TFrequencyIterator>::VerifyPreconditions() ITKv5_CONST
+FrequencyBandImageFilter<TImageType, TFrequencyIterator>::VerifyPreconditions() const
 {
   this->Superclass::VerifyPreconditions();
 

Modules/Filtering/ImageGrid/include/itkChangeInformationImageFilter.h

@@ -235,7 +235,7 @@ class ITK_TEMPLATE_EXPORT ChangeInformationImageFilter : public ImageToImageFilt
    * \sa ProcessObject::VerifyInputInformation
    */
   void
-  VerifyInputInformation() ITKv5_CONST override
+  VerifyInputInformation() const override
   {}
 
 private:

Modules/Filtering/ImageGrid/include/itkCropImageFilter.h

@@ -113,7 +113,7 @@ class ITK_TEMPLATE_EXPORT CropImageFilter : public ExtractImageFilter<TInputImag
   GenerateOutputInformation() override;
 
   void
-  VerifyInputInformation() ITKv5_CONST override;
+  VerifyInputInformation() const override;
 
 private:
   SizeType m_UpperBoundaryCropSize{};

Modules/Filtering/ImageGrid/include/itkCropImageFilter.hxx

@@ -58,7 +58,7 @@ CropImageFilter<TInputImage, TOutputImage>::GenerateOutputInformation()
 
 template <typename TInputImage, typename TOutputImage>
 void
-CropImageFilter<TInputImage, TOutputImage>::VerifyInputInformation() ITKv5_CONST
+CropImageFilter<TInputImage, TOutputImage>::VerifyInputInformation() const
 {
   Superclass::VerifyInputInformation();
 

Modules/Filtering/ImageGrid/include/itkInterpolateImagePointsFilter.h

@@ -179,7 +179,7 @@ class ITK_TEMPLATE_EXPORT InterpolateImagePointsFilter : public ImageToImageFilt
    * \sa ProcessObject::VerifyInputInformation
    */
   void
-  VerifyInputInformation() ITKv5_CONST override
+  VerifyInputInformation() const override
   {}
 
 private:

Modules/Filtering/ImageGrid/include/itkPasteImageFilter.h

@@ -167,11 +167,11 @@ class ITK_TEMPLATE_EXPORT PasteImageFilter : public InPlaceImageFilter<TInputIma
    * \sa ProcessObject::VerifyInputInformation
    */
   void
-  VerifyInputInformation() ITKv5_CONST override
+  VerifyInputInformation() const override
   {}
 
   void
-  VerifyPreconditions() ITKv5_CONST override;
+  VerifyPreconditions() const override;
 
   bool
   CanRunInPlace() const override;

Modules/Filtering/ImageGrid/include/itkPasteImageFilter.hxx

@@ -78,7 +78,7 @@ PasteImageFilter<TInputImage, TSourceImage, TOutputImage>::GenerateInputRequeste
 
 template <typename TInputImage, typename TSourceImage, typename TOutputImage>
 void
-PasteImageFilter<TInputImage, TSourceImage, TOutputImage>::VerifyPreconditions() ITKv5_CONST
+PasteImageFilter<TInputImage, TSourceImage, TOutputImage>::VerifyPreconditions() const
 {
   Superclass::VerifyPreconditions();
 

Modules/Filtering/ImageGrid/include/itkResampleImageFilter.h

@@ -185,7 +185,7 @@ class ITK_TEMPLATE_EXPORT ResampleImageFilter : public ImageToImageFilter<TInput
   /* See superclass for doxygen. This method adds the additional check
    * that the output space is set */
   void
-  VerifyPreconditions() ITKv5_CONST override;
+  VerifyPreconditions() const override;
 
   /** Get/Set the coordinate transformation.
    * Set the coordinate transform to use for resampling.  Note that this must
@@ -288,7 +288,7 @@ class ITK_TEMPLATE_EXPORT ResampleImageFilter : public ImageToImageFilter<TInput
    * \sa ProcessObject::VerifyInputInformation
    */
   void
-  VerifyInputInformation() ITKv5_CONST override
+  VerifyInputInformation() const override
   {}
 
   /** ResampleImageFilter produces an image which is a different size

Modules/Filtering/ImageGrid/include/itkResampleImageFilter.hxx

@@ -102,7 +102,7 @@ template <typename TInputImage,
           typename TTransformPrecisionType>
 void
 ResampleImageFilter<TInputImage, TOutputImage, TInterpolatorPrecisionType, TTransformPrecisionType>::
-  VerifyPreconditions() ITKv5_CONST
+  VerifyPreconditions() const
 {
   this->Superclass::VerifyPreconditions();
   const ReferenceImageBaseType * const referenceImage = this->GetReferenceImage();

Modules/Filtering/ImageGrid/include/itkSliceBySliceImageFilter.h

@@ -166,7 +166,7 @@ class ITK_TEMPLATE_EXPORT SliceBySliceImageFilter : public ImageToImageFilter<TI
   ~SliceBySliceImageFilter() override = default;
 
   void
-  VerifyInputInformation() ITKv5_CONST override;
+  VerifyInputInformation() const override;
 
   void
   GenerateData() override;

Modules/Filtering/ImageGrid/include/itkSliceBySliceImageFilter.hxx

@@ -54,7 +54,7 @@ SliceBySliceImageFilter<TInputImage,
                         TInputFilter,
                         TOutputFilter,
                         TInternalInputImageType,
-                        TInternalOutputImageType>::VerifyInputInformation() ITKv5_CONST
+                        TInternalOutputImageType>::VerifyInputInformation() const
 {
 
   Superclass::VerifyInputInformation();