From d715806a365ade9d9c816a46ebee46abcc763cf3 Mon Sep 17 00:00:00 2001
From: Niels Dekker <N.Dekker@lumc.nl>
Date: Mon, 6 Jul 2026 17:20:56 +0200
Subject: [PATCH 1/2] STYLE: Default-member-initializers in
 BinaryMathematicalMorphology

Moved initialization values of non-static data members from
the member-initializer-lists of default-constructors to their
default-member-initializers.

Following C++ Core Guidelines, Jun 14, 2026, "Prefer default member initializers
to member initializers in constructors for constant initializers",
https://isocpp.github.io/CppCoreGuidelines/CppCoreGuidelines#c48-prefer-default-member-initializers-to-member-initializers-in-constructors-for-constant-initializers

Will make Doxygen generated documentation more informative, as default member
initializers appear in the class documentation.
---
 .../include/itkBinaryClosingByReconstructionImageFilter.h     | 2 +-
 .../include/itkBinaryClosingByReconstructionImageFilter.hxx   | 2 --
 .../include/itkBinaryMorphologicalClosingImageFilter.h        | 4 ++--
 .../include/itkBinaryMorphologicalClosingImageFilter.hxx      | 2 --
 .../include/itkBinaryMorphologicalOpeningImageFilter.h        | 2 +-
 .../include/itkBinaryMorphologicalOpeningImageFilter.hxx      | 2 --
 .../include/itkBinaryMorphologyImageFilter.h                  | 4 ++--
 .../include/itkBinaryMorphologyImageFilter.hxx                | 2 --
 .../include/itkBinaryOpeningByReconstructionImageFilter.h     | 2 +-
 .../include/itkBinaryOpeningByReconstructionImageFilter.hxx   | 2 --
 .../include/itkBinaryPruningImageFilter.h                     | 2 +-
 .../include/itkBinaryPruningImageFilter.hxx                   | 1 -
 .../include/itkErodeObjectMorphologyImageFilter.hxx           | 1 -
 .../include/itkObjectMorphologyImageFilter.h                  | 2 +-
 .../include/itkObjectMorphologyImageFilter.hxx                | 2 --
 15 files changed, 9 insertions(+), 23 deletions(-)

diff --git a/Modules/Filtering/BinaryMathematicalMorphology/include/itkBinaryClosingByReconstructionImageFilter.h b/Modules/Filtering/BinaryMathematicalMorphology/include/itkBinaryClosingByReconstructionImageFilter.h
index 21021427f3b..d44f7f103ee 100644
--- a/Modules/Filtering/BinaryMathematicalMorphology/include/itkBinaryClosingByReconstructionImageFilter.h
+++ b/Modules/Filtering/BinaryMathematicalMorphology/include/itkBinaryClosingByReconstructionImageFilter.h
@@ -115,7 +115,7 @@ class ITK_TEMPLATE_EXPORT BinaryClosingByReconstructionImageFilter
   GenerateData() override;
 
 private:
-  InputPixelType m_ForegroundValue{};
+  InputPixelType m_ForegroundValue{ NumericTraits<InputPixelType>::max() };
 
   bool m_FullyConnected{};
 
diff --git a/Modules/Filtering/BinaryMathematicalMorphology/include/itkBinaryClosingByReconstructionImageFilter.hxx b/Modules/Filtering/BinaryMathematicalMorphology/include/itkBinaryClosingByReconstructionImageFilter.hxx
index 25adbb75b58..59759594a8a 100644
--- a/Modules/Filtering/BinaryMathematicalMorphology/include/itkBinaryClosingByReconstructionImageFilter.hxx
+++ b/Modules/Filtering/BinaryMathematicalMorphology/include/itkBinaryClosingByReconstructionImageFilter.hxx
@@ -32,8 +32,6 @@ namespace itk
 
 template <typename TInputImage, typename TKernel>
 BinaryClosingByReconstructionImageFilter<TInputImage, TKernel>::BinaryClosingByReconstructionImageFilter()
-  : m_ForegroundValue(NumericTraits<InputPixelType>::max())
-
 {}
 
 template <typename TInputImage, typename TKernel>
diff --git a/Modules/Filtering/BinaryMathematicalMorphology/include/itkBinaryMorphologicalClosingImageFilter.h b/Modules/Filtering/BinaryMathematicalMorphology/include/itkBinaryMorphologicalClosingImageFilter.h
index 259c4c9d5ac..bb346398473 100644
--- a/Modules/Filtering/BinaryMathematicalMorphology/include/itkBinaryMorphologicalClosingImageFilter.h
+++ b/Modules/Filtering/BinaryMathematicalMorphology/include/itkBinaryMorphologicalClosingImageFilter.h
@@ -112,9 +112,9 @@ class ITK_TEMPLATE_EXPORT BinaryMorphologicalClosingImageFilter
   GenerateData() override;
 
 private:
-  InputPixelType m_ForegroundValue{};
+  InputPixelType m_ForegroundValue{ NumericTraits<InputPixelType>::max() };
 
-  bool m_SafeBorder{};
+  bool m_SafeBorder{ true };
 }; // end of class
 } // end namespace itk
 
diff --git a/Modules/Filtering/BinaryMathematicalMorphology/include/itkBinaryMorphologicalClosingImageFilter.hxx b/Modules/Filtering/BinaryMathematicalMorphology/include/itkBinaryMorphologicalClosingImageFilter.hxx
index ff83d6cd041..10887cec5f1 100644
--- a/Modules/Filtering/BinaryMathematicalMorphology/include/itkBinaryMorphologicalClosingImageFilter.hxx
+++ b/Modules/Filtering/BinaryMathematicalMorphology/include/itkBinaryMorphologicalClosingImageFilter.hxx
@@ -39,8 +39,6 @@ namespace itk
 {
 template <typename TInputImage, typename TOutputImage, typename TKernel>
 BinaryMorphologicalClosingImageFilter<TInputImage, TOutputImage, TKernel>::BinaryMorphologicalClosingImageFilter()
-  : m_ForegroundValue(NumericTraits<InputPixelType>::max())
-  , m_SafeBorder(true)
 {}
 
 template <typename TInputImage, typename TOutputImage, typename TKernel>
diff --git a/Modules/Filtering/BinaryMathematicalMorphology/include/itkBinaryMorphologicalOpeningImageFilter.h b/Modules/Filtering/BinaryMathematicalMorphology/include/itkBinaryMorphologicalOpeningImageFilter.h
index 124af9e90c2..85383cea0ad 100644
--- a/Modules/Filtering/BinaryMathematicalMorphology/include/itkBinaryMorphologicalOpeningImageFilter.h
+++ b/Modules/Filtering/BinaryMathematicalMorphology/include/itkBinaryMorphologicalOpeningImageFilter.h
@@ -110,7 +110,7 @@ class ITK_TEMPLATE_EXPORT BinaryMorphologicalOpeningImageFilter
   GenerateData() override;
 
 private:
-  PixelType m_ForegroundValue{};
+  PixelType m_ForegroundValue{ NumericTraits<PixelType>::max() };
 
   PixelType m_BackgroundValue{};
 }; // end of class
diff --git a/Modules/Filtering/BinaryMathematicalMorphology/include/itkBinaryMorphologicalOpeningImageFilter.hxx b/Modules/Filtering/BinaryMathematicalMorphology/include/itkBinaryMorphologicalOpeningImageFilter.hxx
index 304a1474991..aed99d035cf 100644
--- a/Modules/Filtering/BinaryMathematicalMorphology/include/itkBinaryMorphologicalOpeningImageFilter.hxx
+++ b/Modules/Filtering/BinaryMathematicalMorphology/include/itkBinaryMorphologicalOpeningImageFilter.hxx
@@ -36,8 +36,6 @@ namespace itk
 {
 template <typename TInputImage, typename TOutputImage, typename TKernel>
 BinaryMorphologicalOpeningImageFilter<TInputImage, TOutputImage, TKernel>::BinaryMorphologicalOpeningImageFilter()
-  : m_ForegroundValue(NumericTraits<PixelType>::max())
-  , m_BackgroundValue(PixelType{})
 {}
 
 template <typename TInputImage, typename TOutputImage, typename TKernel>
diff --git a/Modules/Filtering/BinaryMathematicalMorphology/include/itkBinaryMorphologyImageFilter.h b/Modules/Filtering/BinaryMathematicalMorphology/include/itkBinaryMorphologyImageFilter.h
index b77ea3f1da4..f3fc0c9e6c4 100644
--- a/Modules/Filtering/BinaryMathematicalMorphology/include/itkBinaryMorphologyImageFilter.h
+++ b/Modules/Filtering/BinaryMathematicalMorphology/include/itkBinaryMorphologyImageFilter.h
@@ -226,10 +226,10 @@ class ITK_TEMPLATE_EXPORT BinaryMorphologyImageFilter : public KernelImageFilter
 
 private:
   /** Pixel value to dilate */
-  InputPixelType m_ForegroundValue{};
+  InputPixelType m_ForegroundValue{ NumericTraits<InputPixelType>::max() };
 
   /** Pixel value for background */
-  OutputPixelType m_BackgroundValue{};
+  OutputPixelType m_BackgroundValue{ NumericTraits<OutputPixelType>::NonpositiveMin() };
 
   /** Difference sets definition */
   NeighborIndexContainerContainer m_KernelDifferenceSets{};
diff --git a/Modules/Filtering/BinaryMathematicalMorphology/include/itkBinaryMorphologyImageFilter.hxx b/Modules/Filtering/BinaryMathematicalMorphology/include/itkBinaryMorphologyImageFilter.hxx
index 1802c7d6aba..74c87f7e617 100644
--- a/Modules/Filtering/BinaryMathematicalMorphology/include/itkBinaryMorphologyImageFilter.hxx
+++ b/Modules/Filtering/BinaryMathematicalMorphology/include/itkBinaryMorphologyImageFilter.hxx
@@ -31,8 +31,6 @@ namespace itk
 {
 template <typename TInputImage, typename TOutputImage, typename TKernel>
 BinaryMorphologyImageFilter<TInputImage, TOutputImage, TKernel>::BinaryMorphologyImageFilter()
-  : m_ForegroundValue(NumericTraits<InputPixelType>::max())
-  , m_BackgroundValue(NumericTraits<OutputPixelType>::NonpositiveMin())
 {
   // this->SetNumberOfWorkUnits(1);
   this->AnalyzeKernel();
diff --git a/Modules/Filtering/BinaryMathematicalMorphology/include/itkBinaryOpeningByReconstructionImageFilter.h b/Modules/Filtering/BinaryMathematicalMorphology/include/itkBinaryOpeningByReconstructionImageFilter.h
index a92bc0ddd63..54538cb15b5 100644
--- a/Modules/Filtering/BinaryMathematicalMorphology/include/itkBinaryOpeningByReconstructionImageFilter.h
+++ b/Modules/Filtering/BinaryMathematicalMorphology/include/itkBinaryOpeningByReconstructionImageFilter.h
@@ -120,7 +120,7 @@ class ITK_TEMPLATE_EXPORT BinaryOpeningByReconstructionImageFilter
   GenerateData() override;
 
 private:
-  PixelType m_ForegroundValue{};
+  PixelType m_ForegroundValue{ NumericTraits<PixelType>::max() };
 
   PixelType m_BackgroundValue{};
 
diff --git a/Modules/Filtering/BinaryMathematicalMorphology/include/itkBinaryOpeningByReconstructionImageFilter.hxx b/Modules/Filtering/BinaryMathematicalMorphology/include/itkBinaryOpeningByReconstructionImageFilter.hxx
index 16c0cffcc1a..241599dee4d 100644
--- a/Modules/Filtering/BinaryMathematicalMorphology/include/itkBinaryOpeningByReconstructionImageFilter.hxx
+++ b/Modules/Filtering/BinaryMathematicalMorphology/include/itkBinaryOpeningByReconstructionImageFilter.hxx
@@ -28,8 +28,6 @@ namespace itk
 
 template <typename TInputImage, typename TKernel>
 BinaryOpeningByReconstructionImageFilter<TInputImage, TKernel>::BinaryOpeningByReconstructionImageFilter()
-  : m_ForegroundValue(NumericTraits<PixelType>::max())
-  , m_BackgroundValue(PixelType{})
 {}
 
 template <typename TInputImage, typename TKernel>
diff --git a/Modules/Filtering/BinaryMathematicalMorphology/include/itkBinaryPruningImageFilter.h b/Modules/Filtering/BinaryMathematicalMorphology/include/itkBinaryPruningImageFilter.h
index 95e8577caa1..13045a009f2 100644
--- a/Modules/Filtering/BinaryMathematicalMorphology/include/itkBinaryPruningImageFilter.h
+++ b/Modules/Filtering/BinaryMathematicalMorphology/include/itkBinaryPruningImageFilter.h
@@ -133,7 +133,7 @@ class ITK_TEMPLATE_EXPORT BinaryPruningImageFilter : public ImageToImageFilter<T
   ComputePruneImage();
 
 private:
-  unsigned int m_Iteration{};
+  unsigned int m_Iteration{ 3 };
 }; // end of BinaryThinningImageFilter class
 } // end namespace itk
 
diff --git a/Modules/Filtering/BinaryMathematicalMorphology/include/itkBinaryPruningImageFilter.hxx b/Modules/Filtering/BinaryMathematicalMorphology/include/itkBinaryPruningImageFilter.hxx
index 9f7e28e4205..2d6d96f95b7 100644
--- a/Modules/Filtering/BinaryMathematicalMorphology/include/itkBinaryPruningImageFilter.hxx
+++ b/Modules/Filtering/BinaryMathematicalMorphology/include/itkBinaryPruningImageFilter.hxx
@@ -29,7 +29,6 @@ namespace itk
  */
 template <typename TInputImage, typename TOutputImage>
 BinaryPruningImageFilter<TInputImage, TOutputImage>::BinaryPruningImageFilter()
-  : m_Iteration(3)
 {
   this->SetNumberOfRequiredOutputs(1);
 
diff --git a/Modules/Filtering/BinaryMathematicalMorphology/include/itkErodeObjectMorphologyImageFilter.hxx b/Modules/Filtering/BinaryMathematicalMorphology/include/itkErodeObjectMorphologyImageFilter.hxx
index 07efd4c40ab..05566d981a7 100644
--- a/Modules/Filtering/BinaryMathematicalMorphology/include/itkErodeObjectMorphologyImageFilter.hxx
+++ b/Modules/Filtering/BinaryMathematicalMorphology/include/itkErodeObjectMorphologyImageFilter.hxx
@@ -23,7 +23,6 @@ namespace itk
 {
 template <typename TInputImage, typename TOutputImage, typename TKernel>
 ErodeObjectMorphologyImageFilter<TInputImage, TOutputImage, TKernel>::ErodeObjectMorphologyImageFilter()
-  : m_BackgroundValue(PixelType{})
 {
   m_ErodeBoundaryCondition.SetConstant(NumericTraits<PixelType>::max());
   this->OverrideBoundaryCondition(&m_ErodeBoundaryCondition);
diff --git a/Modules/Filtering/BinaryMathematicalMorphology/include/itkObjectMorphologyImageFilter.h b/Modules/Filtering/BinaryMathematicalMorphology/include/itkObjectMorphologyImageFilter.h
index e9c5f6a1441..72cf89d6384 100644
--- a/Modules/Filtering/BinaryMathematicalMorphology/include/itkObjectMorphologyImageFilter.h
+++ b/Modules/Filtering/BinaryMathematicalMorphology/include/itkObjectMorphologyImageFilter.h
@@ -215,7 +215,7 @@ class ITK_TEMPLATE_EXPORT ObjectMorphologyImageFilter : public ImageToImageFilte
   KernelType m_Kernel{};
 
   /** Pixel value that indicates the object be operated upon */
-  PixelType m_ObjectValue{};
+  PixelType m_ObjectValue{ NumericTraits<PixelType>::OneValue() };
 
   void
   BeforeThreadedGenerateData() override;
diff --git a/Modules/Filtering/BinaryMathematicalMorphology/include/itkObjectMorphologyImageFilter.hxx b/Modules/Filtering/BinaryMathematicalMorphology/include/itkObjectMorphologyImageFilter.hxx
index f0e4ab40d72..e68b2a744aa 100644
--- a/Modules/Filtering/BinaryMathematicalMorphology/include/itkObjectMorphologyImageFilter.hxx
+++ b/Modules/Filtering/BinaryMathematicalMorphology/include/itkObjectMorphologyImageFilter.hxx
@@ -31,8 +31,6 @@ namespace itk
 {
 template <typename TInputImage, typename TOutputImage, typename TKernel>
 ObjectMorphologyImageFilter<TInputImage, TOutputImage, TKernel>::ObjectMorphologyImageFilter()
-  : m_Kernel()
-  , m_ObjectValue(NumericTraits<PixelType>::OneValue())
 {
   m_DefaultBoundaryCondition.SetConstant(PixelType{});
   m_BoundaryCondition = &m_DefaultBoundaryCondition;

From 8a822a57da8da3c055d4fa1429fd95f04d392a58 Mon Sep 17 00:00:00 2001
From: Niels Dekker <N.Dekker@lumc.nl>
Date: Mon, 6 Jul 2026 17:56:46 +0200
Subject: [PATCH 2/2] STYLE: Default empty default-constructors
 BinaryMathematicalMorphology

Defaulted four empty default-constructor from BinaryMathematicalMorphology
inside the definition of their classes.

Will make Doxygen generated documentation more informative, as these
constructors will be marked "default" in the class documentation.
---
 .../include/itkBinaryClosingByReconstructionImageFilter.h    | 2 +-
 .../include/itkBinaryClosingByReconstructionImageFilter.hxx  | 5 -----
 .../include/itkBinaryMorphologicalClosingImageFilter.h       | 2 +-
 .../include/itkBinaryMorphologicalClosingImageFilter.hxx     | 4 ----
 .../include/itkBinaryMorphologicalOpeningImageFilter.h       | 2 +-
 .../include/itkBinaryMorphologicalOpeningImageFilter.hxx     | 4 ----
 .../include/itkBinaryOpeningByReconstructionImageFilter.h    | 2 +-
 .../include/itkBinaryOpeningByReconstructionImageFilter.hxx  | 5 -----
 8 files changed, 4 insertions(+), 22 deletions(-)

diff --git a/Modules/Filtering/BinaryMathematicalMorphology/include/itkBinaryClosingByReconstructionImageFilter.h b/Modules/Filtering/BinaryMathematicalMorphology/include/itkBinaryClosingByReconstructionImageFilter.h
index d44f7f103ee..3f0f301a556 100644
--- a/Modules/Filtering/BinaryMathematicalMorphology/include/itkBinaryClosingByReconstructionImageFilter.h
+++ b/Modules/Filtering/BinaryMathematicalMorphology/include/itkBinaryClosingByReconstructionImageFilter.h
@@ -96,7 +96,7 @@ class ITK_TEMPLATE_EXPORT BinaryClosingByReconstructionImageFilter
   itkBooleanMacro(FullyConnected);
   /** @ITKEndGrouping */
 protected:
-  BinaryClosingByReconstructionImageFilter();
+  BinaryClosingByReconstructionImageFilter() = default;
   ~BinaryClosingByReconstructionImageFilter() override = default;
   void
   PrintSelf(std::ostream & os, Indent indent) const override;
diff --git a/Modules/Filtering/BinaryMathematicalMorphology/include/itkBinaryClosingByReconstructionImageFilter.hxx b/Modules/Filtering/BinaryMathematicalMorphology/include/itkBinaryClosingByReconstructionImageFilter.hxx
index 59759594a8a..f19d9db8a27 100644
--- a/Modules/Filtering/BinaryMathematicalMorphology/include/itkBinaryClosingByReconstructionImageFilter.hxx
+++ b/Modules/Filtering/BinaryMathematicalMorphology/include/itkBinaryClosingByReconstructionImageFilter.hxx
@@ -29,11 +29,6 @@
 
 namespace itk
 {
-
-template <typename TInputImage, typename TKernel>
-BinaryClosingByReconstructionImageFilter<TInputImage, TKernel>::BinaryClosingByReconstructionImageFilter()
-{}
-
 template <typename TInputImage, typename TKernel>
 void
 BinaryClosingByReconstructionImageFilter<TInputImage, TKernel>::GenerateInputRequestedRegion()
diff --git a/Modules/Filtering/BinaryMathematicalMorphology/include/itkBinaryMorphologicalClosingImageFilter.h b/Modules/Filtering/BinaryMathematicalMorphology/include/itkBinaryMorphologicalClosingImageFilter.h
index bb346398473..0728ded3b31 100644
--- a/Modules/Filtering/BinaryMathematicalMorphology/include/itkBinaryMorphologicalClosingImageFilter.h
+++ b/Modules/Filtering/BinaryMathematicalMorphology/include/itkBinaryMorphologicalClosingImageFilter.h
@@ -101,7 +101,7 @@ class ITK_TEMPLATE_EXPORT BinaryMorphologicalClosingImageFilter
   itkBooleanMacro(SafeBorder);
   /** @ITKEndGrouping */
 protected:
-  BinaryMorphologicalClosingImageFilter();
+  BinaryMorphologicalClosingImageFilter() = default;
   ~BinaryMorphologicalClosingImageFilter() override = default;
   void
   PrintSelf(std::ostream & os, Indent indent) const override;
diff --git a/Modules/Filtering/BinaryMathematicalMorphology/include/itkBinaryMorphologicalClosingImageFilter.hxx b/Modules/Filtering/BinaryMathematicalMorphology/include/itkBinaryMorphologicalClosingImageFilter.hxx
index 10887cec5f1..440f0344a19 100644
--- a/Modules/Filtering/BinaryMathematicalMorphology/include/itkBinaryMorphologicalClosingImageFilter.hxx
+++ b/Modules/Filtering/BinaryMathematicalMorphology/include/itkBinaryMorphologicalClosingImageFilter.hxx
@@ -37,10 +37,6 @@
 
 namespace itk
 {
-template <typename TInputImage, typename TOutputImage, typename TKernel>
-BinaryMorphologicalClosingImageFilter<TInputImage, TOutputImage, TKernel>::BinaryMorphologicalClosingImageFilter()
-{}
-
 template <typename TInputImage, typename TOutputImage, typename TKernel>
 void
 BinaryMorphologicalClosingImageFilter<TInputImage, TOutputImage, TKernel>::GenerateData()
diff --git a/Modules/Filtering/BinaryMathematicalMorphology/include/itkBinaryMorphologicalOpeningImageFilter.h b/Modules/Filtering/BinaryMathematicalMorphology/include/itkBinaryMorphologicalOpeningImageFilter.h
index 85383cea0ad..3b557ed5be1 100644
--- a/Modules/Filtering/BinaryMathematicalMorphology/include/itkBinaryMorphologicalOpeningImageFilter.h
+++ b/Modules/Filtering/BinaryMathematicalMorphology/include/itkBinaryMorphologicalOpeningImageFilter.h
@@ -99,7 +99,7 @@ class ITK_TEMPLATE_EXPORT BinaryMorphologicalOpeningImageFilter
   itkGetConstMacro(BackgroundValue, PixelType);
 
 protected:
-  BinaryMorphologicalOpeningImageFilter();
+  BinaryMorphologicalOpeningImageFilter() = default;
   ~BinaryMorphologicalOpeningImageFilter() override = default;
   void
   PrintSelf(std::ostream & os, Indent indent) const override;
diff --git a/Modules/Filtering/BinaryMathematicalMorphology/include/itkBinaryMorphologicalOpeningImageFilter.hxx b/Modules/Filtering/BinaryMathematicalMorphology/include/itkBinaryMorphologicalOpeningImageFilter.hxx
index aed99d035cf..a665926f1e9 100644
--- a/Modules/Filtering/BinaryMathematicalMorphology/include/itkBinaryMorphologicalOpeningImageFilter.hxx
+++ b/Modules/Filtering/BinaryMathematicalMorphology/include/itkBinaryMorphologicalOpeningImageFilter.hxx
@@ -34,10 +34,6 @@
 
 namespace itk
 {
-template <typename TInputImage, typename TOutputImage, typename TKernel>
-BinaryMorphologicalOpeningImageFilter<TInputImage, TOutputImage, TKernel>::BinaryMorphologicalOpeningImageFilter()
-{}
-
 template <typename TInputImage, typename TOutputImage, typename TKernel>
 void
 BinaryMorphologicalOpeningImageFilter<TInputImage, TOutputImage, TKernel>::GenerateData()
diff --git a/Modules/Filtering/BinaryMathematicalMorphology/include/itkBinaryOpeningByReconstructionImageFilter.h b/Modules/Filtering/BinaryMathematicalMorphology/include/itkBinaryOpeningByReconstructionImageFilter.h
index 54538cb15b5..87b742ed399 100644
--- a/Modules/Filtering/BinaryMathematicalMorphology/include/itkBinaryOpeningByReconstructionImageFilter.h
+++ b/Modules/Filtering/BinaryMathematicalMorphology/include/itkBinaryOpeningByReconstructionImageFilter.h
@@ -101,7 +101,7 @@ class ITK_TEMPLATE_EXPORT BinaryOpeningByReconstructionImageFilter
   itkBooleanMacro(FullyConnected);
   /** @ITKEndGrouping */
 protected:
-  BinaryOpeningByReconstructionImageFilter();
+  BinaryOpeningByReconstructionImageFilter() = default;
   ~BinaryOpeningByReconstructionImageFilter() override = default;
   void
   PrintSelf(std::ostream & os, Indent indent) const override;
diff --git a/Modules/Filtering/BinaryMathematicalMorphology/include/itkBinaryOpeningByReconstructionImageFilter.hxx b/Modules/Filtering/BinaryMathematicalMorphology/include/itkBinaryOpeningByReconstructionImageFilter.hxx
index 241599dee4d..96e7d81691a 100644
--- a/Modules/Filtering/BinaryMathematicalMorphology/include/itkBinaryOpeningByReconstructionImageFilter.hxx
+++ b/Modules/Filtering/BinaryMathematicalMorphology/include/itkBinaryOpeningByReconstructionImageFilter.hxx
@@ -25,11 +25,6 @@
 
 namespace itk
 {
-
-template <typename TInputImage, typename TKernel>
-BinaryOpeningByReconstructionImageFilter<TInputImage, TKernel>::BinaryOpeningByReconstructionImageFilter()
-{}
-
 template <typename TInputImage, typename TKernel>
 void
 BinaryOpeningByReconstructionImageFilter<TInputImage, TKernel>::GenerateInputRequestedRegion()