From 1ff5932f4b219a73b2f531759f697fc9df786c78 Mon Sep 17 00:00:00 2001
From: Niels Dekker <N.Dekker@lumc.nl>
Date: Thu, 6 Feb 2025 17:16:33 +0100
Subject: [PATCH] STYLE: Move empty `const` member functions from .hxx to .h

Moved the member function definitions of `const`member functions that have 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 `^..[^:,].+\) const\r\n{}` in "itk*.hxx" files.

- Follow-up to pull request https://github.com/InsightSoftwareConsortium/ITK/pull/5198
commit b94770d8746133a441df1796e3d1628c6935adfc
"STYLE: Move empty member functions with empty param list from .hxx to .h"
---
 Modules/Filtering/LabelMap/include/itkLabelObjectLine.h   | 3 ++-
 Modules/Filtering/LabelMap/include/itkLabelObjectLine.hxx | 8 --------
 .../Common/include/itkEuclideanDistancePointMetric.h      | 4 +++-
 .../Common/include/itkEuclideanDistancePointMetric.hxx    | 7 -------
 4 files changed, 5 insertions(+), 17 deletions(-)

diff --git a/Modules/Filtering/LabelMap/include/itkLabelObjectLine.h b/Modules/Filtering/LabelMap/include/itkLabelObjectLine.h
index 25e63b7f9bb..fec4b48ec6a 100644
--- a/Modules/Filtering/LabelMap/include/itkLabelObjectLine.h
+++ b/Modules/Filtering/LabelMap/include/itkLabelObjectLine.h
@@ -97,7 +97,8 @@ class ITK_TEMPLATE_EXPORT LabelObjectLine
   PrintHeader(std::ostream & os, Indent indent) const;
 
   virtual void
-  PrintTrailer(std::ostream & os, Indent indent) const;
+  PrintTrailer(std::ostream & itkNotUsed(os), Indent itkNotUsed(indent)) const
+  {}
 
 private:
   IndexType  m_Index{};
diff --git a/Modules/Filtering/LabelMap/include/itkLabelObjectLine.hxx b/Modules/Filtering/LabelMap/include/itkLabelObjectLine.hxx
index 70a0e1c3741..67bbd6fbc78 100644
--- a/Modules/Filtering/LabelMap/include/itkLabelObjectLine.hxx
+++ b/Modules/Filtering/LabelMap/include/itkLabelObjectLine.hxx
@@ -126,14 +126,6 @@ LabelObjectLine<VImageDimension>::PrintSelf(std::ostream & os, Indent indent) co
   os << indent << "Index: " << this->m_Index << std::endl;
   os << indent << "Length: " << this->m_Length << std::endl;
 }
-
-/**
- * Define a default print trailer for all objects.
- */
-template <unsigned int VImageDimension>
-void
-LabelObjectLine<VImageDimension>::PrintTrailer(std::ostream & itkNotUsed(os), Indent itkNotUsed(indent)) const
-{}
 } // namespace itk
 
 #endif
diff --git a/Modules/Registration/Common/include/itkEuclideanDistancePointMetric.h b/Modules/Registration/Common/include/itkEuclideanDistancePointMetric.h
index 7696f8264e9..6eabca189cf 100644
--- a/Modules/Registration/Common/include/itkEuclideanDistancePointMetric.h
+++ b/Modules/Registration/Common/include/itkEuclideanDistancePointMetric.h
@@ -90,7 +90,9 @@ class ITK_TEMPLATE_EXPORT EuclideanDistancePointMetric
 
   /** Get the derivatives of the match measure. */
   void
-  GetDerivative(const TransformParametersType & parameters, DerivativeType & Derivative) const override;
+  GetDerivative(const TransformParametersType & itkNotUsed(parameters),
+                DerivativeType &                itkNotUsed(derivative)) const override
+  {}
 
   /**  Get the match measure, i.e. the value for single valued optimizers. */
   MeasureType
diff --git a/Modules/Registration/Common/include/itkEuclideanDistancePointMetric.hxx b/Modules/Registration/Common/include/itkEuclideanDistancePointMetric.hxx
index e34b6f62731..4085140f1bb 100644
--- a/Modules/Registration/Common/include/itkEuclideanDistancePointMetric.hxx
+++ b/Modules/Registration/Common/include/itkEuclideanDistancePointMetric.hxx
@@ -128,13 +128,6 @@ EuclideanDistancePointMetric<TFixedPointSet, TMovingPointSet, TDistanceMap>::Get
   return measure;
 }
 
-template <typename TFixedPointSet, typename TMovingPointSet, typename TDistanceMap>
-void
-EuclideanDistancePointMetric<TFixedPointSet, TMovingPointSet, TDistanceMap>::GetDerivative(
-  const TransformParametersType & itkNotUsed(parameters),
-  DerivativeType &                itkNotUsed(derivative)) const
-{}
-
 template <typename TFixedPointSet, typename TMovingPointSet, typename TDistanceMap>
 void
 EuclideanDistancePointMetric<TFixedPointSet, TMovingPointSet, TDistanceMap>::GetValueAndDerivative(