STYLE: Move empty member functions with empty param list from .hxx to .h

Moved the member function definitions of member functions that have an empty
parameter list and an empty member function definition from their "itk*.hxx"
file to the corresponding "itk*.h" file, and into their class definition.

Found by regular expression `::.+\(\)\r\n{}` in "itk*.hxx" files.

Suggested by Denis Shamonin.

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/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