Move empty member function definitions from "itk*.hxx" to "itk*.h"

Modules/Core/Common/include/itkMapContainer.h

@@ -461,7 +461,8 @@ class ITK_TEMPLATE_EXPORT MapContainer
    * memory usage.
    */
   void
-  Squeeze();
+  Squeeze()
+  {}
 
   /**
    * Tell the container to release any memory it may have allocated and

Modules/Core/Common/include/itkMapContainer.hxx

@@ -226,16 +226,6 @@ MapContainer<TElementIdentifier, TElement>::Reserve(ElementIdentifier sz)
   }
 }
 
-/**
- * Tell the container to try to minimize its memory usage for storage of
- * the current number of elements.  This is NOT guaranteed to decrease
- * memory usage.
- */
-template <typename TElementIdentifier, typename TElement>
-void
-MapContainer<TElementIdentifier, TElement>::Squeeze()
-{}
-
 /**
  * Tell the container to release any memory it may have allocated and
  * return itself to its initial state.

Modules/Core/Common/include/itkPyImageFilter.h

@@ -102,7 +102,7 @@ class ITK_TEMPLATE_EXPORT PyImageFilter : public ImageToImageFilter<TInputImage,
   }
 
 protected:
-  PyImageFilter();
+  PyImageFilter() = default;
   ~PyImageFilter() override;
 
   void

Modules/Core/Common/include/itkPyImageFilter.hxx

@@ -23,10 +23,6 @@
 namespace itk
 {
 
-template <class TInputImage, class TOutputImage>
-PyImageFilter<TInputImage, TOutputImage>::PyImageFilter()
-{}
-
 template <class TInputImage, class TOutputImage>
 PyImageFilter<TInputImage, TOutputImage>::~PyImageFilter()
 {

Modules/Core/Common/include/itkVectorContainer.h

@@ -549,7 +549,8 @@ class ITK_TEMPLATE_EXPORT VectorContainer
    * with other containers in the toolkit.
    */
   void
-  Squeeze();
+  Squeeze()
+  {}
 
   /**
    * Clear the elements. The final size will be zero.

Modules/Core/Common/include/itkVectorContainer.hxx

@@ -178,11 +178,6 @@ VectorContainer<TElementIdentifier, TElement>::Reserve(ElementIdentifier sz)
 {
   this->CreateIndex(sz - 1);
 }
-
-template <typename TElementIdentifier, typename TElement>
-void
-VectorContainer<TElementIdentifier, TElement>::Squeeze()
-{}
 } // namespace itk::detail
 
 #endif

Modules/Core/Mesh/include/itkImageToMeshFilter.h

@@ -87,9 +87,10 @@ class ITK_TEMPLATE_EXPORT ImageToMeshFilter : public MeshSource<TOutputMesh>
   OutputMeshType *
   GetOutput();
 
-  /** Prepare the output */
+  /** Prepare the output. This is a void implementation to prevent the ProcessObject version to be called. */
   void
-  GenerateOutputInformation() override;
+  GenerateOutputInformation() override
+  {}
 
 protected:
   ImageToMeshFilter();

Modules/Core/Mesh/include/itkImageToMeshFilter.hxx

@@ -78,15 +78,6 @@ ImageToMeshFilter<TInputImage, TOutputMesh>::GetOutput() -> OutputMeshType *
   return dynamic_cast<OutputMeshType *>(this->ProcessObject::GetOutput(0));
 }
 
-/**
- * copy information from first input to all outputs
- * This is a void implementation to prevent the
- * ProcessObject version to be called
- */
-template <typename TInputImage, typename TOutputMesh>
-void
-ImageToMeshFilter<TInputImage, TOutputMesh>::GenerateOutputInformation()
-{}
 } // end namespace itk
 
 #endif

Modules/Filtering/Denoising/include/itkPatchBasedDenoisingImageFilter.h

@@ -431,7 +431,8 @@ class ITK_TEMPLATE_EXPORT PatchBasedDenoisingImageFilter
   ThreadedApplyUpdate(const InputImageRegionType & regionToProcess, const int itkNotUsed(threadId));
 
   void
-  PostProcessOutput() override;
+  PostProcessOutput() override
+  {}
 
   virtual void
   SetThreadData(int threadId, const ThreadDataStruct & data);

Modules/Filtering/Denoising/include/itkPatchBasedDenoisingImageFilter.hxx

@@ -2332,11 +2332,6 @@ PatchBasedDenoisingImageFilter<TInputImage, TOutputImage>::ComputeGradientJointE
   return gradientJointEntropy;
 }
 
-template <typename TInputImage, typename TOutputImage>
-void
-PatchBasedDenoisingImageFilter<TInputImage, TOutputImage>::PostProcessOutput()
-{}
-
 template <typename TInputImage, typename TOutputImage>
 void
 PatchBasedDenoisingImageFilter<TInputImage, TOutputImage>::PrintSelf(std::ostream & os, Indent indent) const

Modules/Numerics/FEM/include/itkFEMSolver.h

@@ -382,7 +382,8 @@ class ITK_TEMPLATE_EXPORT Solver : public ProcessObject
 
   /** Decompose matrix using svd, qr, etc. if needed. */
   void
-  DecomposeK();
+  DecomposeK()
+  {}
 
   /** Solve for the displacement vector u. May be overridden in derived
    * classes. */

Modules/Numerics/FEM/include/itkFEMSolver.hxx

@@ -517,11 +517,6 @@ Solver<VDimension>::AssembleF(int dim)
   }
 }
 
-template <unsigned int VDimension>
-void
-Solver<VDimension>::DecomposeK()
-{}
-
 template <unsigned int VDimension>
 void
 Solver<VDimension>::RunSolver()

Modules/Numerics/NarrowBand/include/itkNarrowBandImageFilterBase.h

@@ -271,7 +271,8 @@ class ITK_TEMPLATE_EXPORT NarrowBandImageFilterBase : public FiniteDifferenceIma
   /** This method allows deallocation of data and further post processing
    */
   void
-  PostProcessOutput() override;
+  PostProcessOutput() override
+  {}
 
   /* This function clears all pixels from the narrow band */
   void

Modules/Numerics/NarrowBand/include/itkNarrowBandImageFilterBase.hxx

@@ -281,11 +281,6 @@ NarrowBandImageFilterBase<TInputImage, TOutputImage>::ThreadedCalculateChange(co
   return timeStep;
 }
 
-template <typename TInputImage, typename TOutputImage>
-void
-NarrowBandImageFilterBase<TInputImage, TOutputImage>::PostProcessOutput()
-{}
-
 template <typename TInputImage, typename TOutputImage>
 void
 NarrowBandImageFilterBase<TInputImage, TOutputImage>::GetSplitRegion(const size_t & i, ThreadRegionType & splitRegion)

Modules/Segmentation/LevelSets/include/itkBinaryMaskToNarrowBandPointSetFilter.h

@@ -141,7 +141,8 @@ class ITK_TEMPLATE_EXPORT BinaryMaskToNarrowBandPointSetFilter : public ImageToM
 
   /** Some type alias associated with the output mesh. */
   void
-  GenerateOutputInformation() override;
+  GenerateOutputInformation() override
+  {}
 
 private:
   DistanceFilterPointer m_DistanceFilter{};

Modules/Segmentation/LevelSets/include/itkBinaryMaskToNarrowBandPointSetFilter.hxx

@@ -62,14 +62,6 @@ BinaryMaskToNarrowBandPointSetFilter<TInputImage, TOutputMesh>::PrintSelf(std::o
   os << indent << "BandWidth: " << m_BandWidth << std::endl;
 }
 
-/**
- *
- */
-template <typename TInputImage, typename TOutputMesh>
-void
-BinaryMaskToNarrowBandPointSetFilter<TInputImage, TOutputMesh>::GenerateOutputInformation()
-{}
-
 /**
  *
  */

Modules/Segmentation/LevelSetsv4/include/itkLevelSetDomainPartitionMesh.h

@@ -71,7 +71,8 @@ class ITK_TEMPLATE_EXPORT LevelSetDomainPartitionMesh : public LevelSetDomainPar
   /** Allocate a list mesh with each node being a list of overlapping
    *  level set support at that pixel */
   void
-  AllocateListDomain();
+  AllocateListDomain()
+  {}
 
 private:
   MeshPointer  m_Mesh{};

Modules/Segmentation/LevelSetsv4/include/itkLevelSetDomainPartitionMesh.hxx

@@ -48,11 +48,6 @@ LevelSetDomainPartitionMesh<TMesh>::PopulateListDomain()
   }
 }
 
-template <typename TMesh>
-void
-LevelSetDomainPartitionMesh<TMesh>::AllocateListDomain()
-{}
-
 } // end namespace itk
 
 #endif

Modules/Segmentation/LevelSetsv4/include/itkLevelSetEquationAdvectionTerm.h

@@ -109,7 +109,8 @@ class ITK_TEMPLATE_EXPORT LevelSetEquationAdvectionTerm : public LevelSetEquatio
 
   /** \todo to be documented. */
   void
-  Update() override;
+  Update() override
+  {}
 
   /** Initialize the parameters in the terms prior to an iteration */
   void

Modules/Segmentation/LevelSetsv4/include/itkLevelSetEquationAdvectionTerm.hxx

@@ -123,11 +123,6 @@ void
 LevelSetEquationAdvectionTerm<TInput, TLevelSetContainer>::Initialize(const LevelSetInputIndexType &)
 {}
 
-template <typename TInput, typename TLevelSetContainer>
-void
-LevelSetEquationAdvectionTerm<TInput, TLevelSetContainer>::Update()
-{}
-
 template <typename TInput, typename TLevelSetContainer>
 void
 LevelSetEquationAdvectionTerm<TInput, TLevelSetContainer>::UpdatePixel(

Modules/Segmentation/LevelSetsv4/include/itkLevelSetEquationBinaryMaskTerm.h

@@ -85,7 +85,8 @@ class ITK_TEMPLATE_EXPORT LevelSetEquationBinaryMaskTerm : public LevelSetEquati
 
   /** Update the term parameter values at end of iteration */
   void
-  Update() override;
+  Update() override
+  {}
 
   /** Initialize parameters in the terms prior to an iteration */
   void

Modules/Segmentation/LevelSetsv4/include/itkLevelSetEquationBinaryMaskTerm.hxx

@@ -30,11 +30,6 @@ LevelSetEquationBinaryMaskTerm<TInput, TLevelSetContainer>::LevelSetEquationBina
   this->m_RequiredData.insert("Value");
 }
 
-template <typename TInput, typename TLevelSetContainer>
-void
-LevelSetEquationBinaryMaskTerm<TInput, TLevelSetContainer>::Update()
-{}
-
 template <typename TInput, typename TLevelSetContainer>
 void
 LevelSetEquationBinaryMaskTerm<TInput, TLevelSetContainer>::InitializeParameters()

Modules/Segmentation/LevelSetsv4/include/itkLevelSetEquationCurvatureTerm.h

@@ -108,7 +108,8 @@ class ITK_TEMPLATE_EXPORT LevelSetEquationCurvatureTerm : public LevelSetEquatio
 
   /** Update the term parameter values at end of iteration */
   void
-  Update() override;
+  Update() override
+  {}
 
   /** Initialize the parameters in the terms prior to an iteration */
   void

Modules/Segmentation/LevelSetsv4/include/itkLevelSetEquationCurvatureTerm.hxx

@@ -81,11 +81,6 @@ void
 LevelSetEquationCurvatureTerm<TInput, TLevelSetContainer, TCurvatureImage>::Initialize(const LevelSetInputIndexType &)
 {}
 
-template <typename TInput, typename TLevelSetContainer, typename TCurvatureImage>
-void
-LevelSetEquationCurvatureTerm<TInput, TLevelSetContainer, TCurvatureImage>::Update()
-{}
-
 template <typename TInput, typename TLevelSetContainer, typename TCurvatureImage>
 void
 LevelSetEquationCurvatureTerm<TInput, TLevelSetContainer, TCurvatureImage>::UpdatePixel(

Modules/Segmentation/LevelSetsv4/include/itkLevelSetEquationLaplacianTerm.h

@@ -92,7 +92,8 @@ class ITK_TEMPLATE_EXPORT LevelSetEquationLaplacianTerm : public LevelSetEquatio
 
   /** Update the term parameter values at end of iteration */
   void
-  Update() override;
+  Update() override
+  {}
 
   /** Initialize the parameters in the terms prior to an iteration */
   void

Modules/Segmentation/LevelSetsv4/include/itkLevelSetEquationLaplacianTerm.hxx

@@ -41,11 +41,6 @@ void
 LevelSetEquationLaplacianTerm<TInput, TLevelSetContainer>::Initialize(const LevelSetInputIndexType &)
 {}
 
-template <typename TInput, typename TLevelSetContainer>
-void
-LevelSetEquationLaplacianTerm<TInput, TLevelSetContainer>::Update()
-{}
-
 template <typename TInput, typename TLevelSetContainer>
 void
 LevelSetEquationLaplacianTerm<TInput, TLevelSetContainer>::UpdatePixel(

Modules/Segmentation/LevelSetsv4/include/itkLevelSetEquationOverlapPenaltyTerm.h

@@ -94,7 +94,8 @@ class ITK_TEMPLATE_EXPORT LevelSetEquationOverlapPenaltyTerm
 
   /** Update the term parameter values at end of iteration */
   void
-  Update() override;
+  Update() override
+  {}
 
   /** Initialize parameters in the terms prior to an iteration */
   void

Modules/Segmentation/LevelSetsv4/include/itkLevelSetEquationOverlapPenaltyTerm.hxx

@@ -32,11 +32,6 @@ LevelSetEquationOverlapPenaltyTerm<TInput, TLevelSetContainer>::LevelSetEquation
   this->m_CacheImage = nullptr;
 }
 
-template <typename TInput, typename TLevelSetContainer>
-void
-LevelSetEquationOverlapPenaltyTerm<TInput, TLevelSetContainer>::Update()
-{}
-
 template <typename TInput, typename TLevelSetContainer>
 void
 LevelSetEquationOverlapPenaltyTerm<TInput, TLevelSetContainer>::UpdatePixel(

Modules/Segmentation/LevelSetsv4/include/itkLevelSetEquationPropagationTerm.h

@@ -102,7 +102,8 @@ class ITK_TEMPLATE_EXPORT LevelSetEquationPropagationTerm : public LevelSetEquat
 
   /** \todo to be documented. */
   void
-  Update() override;
+  Update() override
+  {}
 
   /** Initialize the parameters in the terms prior to an iteration */
   void

Modules/Segmentation/LevelSetsv4/include/itkLevelSetEquationPropagationTerm.hxx

@@ -54,11 +54,6 @@ LevelSetEquationPropagationTerm<TInput, TLevelSetContainer, TPropagationImage>::
   const LevelSetInputIndexType &)
 {}
 
-template <typename TInput, typename TLevelSetContainer, typename TPropagationImage>
-void
-LevelSetEquationPropagationTerm<TInput, TLevelSetContainer, TPropagationImage>::Update()
-{}
-
 template <typename TInput, typename TLevelSetContainer, typename TPropagationImage>
 void
 LevelSetEquationPropagationTerm<TInput, TLevelSetContainer, TPropagationImage>::UpdatePixel(

Modules/Segmentation/LevelSetsv4/include/itkLevelSetEvolutionBase.h

@@ -140,16 +140,19 @@ class ITK_TEMPLATE_EXPORT LevelSetEvolutionBase : public Object
   /** Initialize the update buffers for all level sets to hold the updates of
    *  equations in each iteration. No-op by default. */
   virtual void
-  AllocateUpdateBuffer();
+  AllocateUpdateBuffer()
+  {}
 
   /** Computer the update at each pixel and store in the update buffer. No-op by
    * default. */
   virtual void
-  ComputeIteration();
+  ComputeIteration()
+  {}
 
   /** Compute the time-step for the next iteration. No-op by default. */
   virtual void
-  ComputeTimeStepForNextIteration();
+  ComputeTimeStepForNextIteration()
+  {}
 
   virtual void
   UpdateLevelSets() = 0;

Modules/Segmentation/LevelSetsv4/include/itkLevelSetEvolutionBase.hxx

@@ -236,20 +236,5 @@ LevelSetEvolutionBase<TEquationContainer, TLevelSet>::Evolve()
   }
 }
 
-template <typename TEquationContainer, typename TLevelSet>
-void
-LevelSetEvolutionBase<TEquationContainer, TLevelSet>::AllocateUpdateBuffer()
-{}
-
-template <typename TEquationContainer, typename TLevelSet>
-void
-LevelSetEvolutionBase<TEquationContainer, TLevelSet>::ComputeIteration()
-{}
-
-template <typename TEquationContainer, typename TLevelSet>
-void
-LevelSetEvolutionBase<TEquationContainer, TLevelSet>::ComputeTimeStepForNextIteration()
-{}
-
 } // namespace itk
 #endif // itkLevelSetEvolutionBase_hxx