STYLE: Default default-constructor of SpatialFunction classes

Defaulted the default-constructors of five SpatialFunction class templates:

 - BinaryThresholdSpatialFunction
 - EllipsoidInteriorExteriorSpatialFunction
 - GaussianDerivativeSpatialFunction
 - GaussianSpatialFunction
 - SphereSpatialFunction

Author: N-Dekker

Modules/Core/Common/include/itkBinaryThresholdSpatialFunction.h

@@ -87,13 +87,13 @@ class ITK_TEMPLATE_EXPORT BinaryThresholdSpatialFunction
   Evaluate(const InputType & point) const override;
 
 protected:
-  BinaryThresholdSpatialFunction();
+  BinaryThresholdSpatialFunction() = default;
   ~BinaryThresholdSpatialFunction() override = default;
   void
   PrintSelf(std::ostream & os, Indent indent) const override;
 
-  FunctionOutputType m_LowerThreshold{};
-  FunctionOutputType m_UpperThreshold{};
+  FunctionOutputType m_LowerThreshold{ NumericTraits<FunctionOutputType>::NonpositiveMin() };
+  FunctionOutputType m_UpperThreshold{ NumericTraits<FunctionOutputType>::max() };
 
   typename FunctionType::Pointer m_Function{};
 };

Modules/Core/Common/include/itkBinaryThresholdSpatialFunction.hxx

@@ -21,13 +21,6 @@
 
 namespace itk
 {
-template <typename TFunction>
-BinaryThresholdSpatialFunction<TFunction>::BinaryThresholdSpatialFunction()
-{
-  m_LowerThreshold = NumericTraits<FunctionOutputType>::NonpositiveMin();
-  m_UpperThreshold = NumericTraits<FunctionOutputType>::max();
-  m_Function = nullptr;
-}
 
 template <typename TFunction>
 void

Modules/Core/Common/include/itkEllipsoidInteriorExteriorSpatialFunction.h

@@ -81,7 +81,7 @@ class ITK_TEMPLATE_EXPORT EllipsoidInteriorExteriorSpatialFunction
   Evaluate(const InputType & position) const override;
 
 protected:
-  EllipsoidInteriorExteriorSpatialFunction();
+  EllipsoidInteriorExteriorSpatialFunction() = default;
   ~EllipsoidInteriorExteriorSpatialFunction() override = default;
 
   void
@@ -92,7 +92,7 @@ class ITK_TEMPLATE_EXPORT EllipsoidInteriorExteriorSpatialFunction
   InputType m_Center{};
 
   /** The axes lengths of the ellipsoid. */
-  InputType m_Axes{};
+  InputType m_Axes{ MakeFilled<InputType>(1.0f) };
 
   /** The orientation vectors (must be orthogonal) of the ellipsoid axes. */
   OrientationType m_Orientations{};

Modules/Core/Common/include/itkEllipsoidInteriorExteriorSpatialFunction.hxx

@@ -22,13 +22,6 @@
 
 namespace itk
 {
-template <unsigned int VDimension, typename TInput>
-EllipsoidInteriorExteriorSpatialFunction<VDimension, TInput>::EllipsoidInteriorExteriorSpatialFunction()
-{
-  m_Axes.Fill(1.0f);   // Lengths of ellipsoid axes.
-  m_Center.Fill(0.0f); // Origin of ellipsoid
-}
-
 template <unsigned int VDimension, typename TInput>
 auto
 EllipsoidInteriorExteriorSpatialFunction<VDimension, TInput>::Evaluate(const InputType & position) const -> OutputType

Modules/Core/Common/include/itkGaussianDerivativeSpatialFunction.h

@@ -91,7 +91,7 @@ class ITK_TEMPLATE_EXPORT GaussianDerivativeSpatialFunction : public SpatialFunc
   itkGetConstMacro(Direction, unsigned int);
 
 protected:
-  GaussianDerivativeSpatialFunction();
+  GaussianDerivativeSpatialFunction() = default;
   ~GaussianDerivativeSpatialFunction() override = default;
   void
   PrintSelf(std::ostream & os, Indent indent) const override;
@@ -101,13 +101,13 @@ class ITK_TEMPLATE_EXPORT GaussianDerivativeSpatialFunction : public SpatialFunc
   mutable unsigned int m_Direction{};
 
   /** The standard deviation in each direction. */
-  ArrayType m_Sigma{};
+  ArrayType m_Sigma{ ArrayType::Filled(1.0) };
 
   /** The mean in each direction. */
   ArrayType m_Mean{};
 
   /** A scale factor multiplied by the true value of the Gaussian. */
-  double m_Scale{};
+  double m_Scale{ 1.0 };
 
   /** Whether or not to normalize the Gaussian. */
   bool m_Normalized{};

Modules/Core/Common/include/itkGaussianDerivativeSpatialFunction.hxx

@@ -23,16 +23,6 @@
 
 namespace itk
 {
-template <typename TOutput, unsigned int VImageDimension, typename TInput>
-GaussianDerivativeSpatialFunction<TOutput, VImageDimension, TInput>::GaussianDerivativeSpatialFunction()
-{
-  m_Mean = ArrayType::Filled(0.0);
-  m_Sigma = ArrayType::Filled(1.0);
-  m_Scale = 1.0;
-  m_Normalized = false;
-  m_Direction = 0;
-}
-
 template <typename TOutput, unsigned int VImageDimension, typename TInput>
 auto
 GaussianDerivativeSpatialFunction<TOutput, VImageDimension, TInput>::Evaluate(const TInput & position) const

Modules/Core/Common/include/itkGaussianSpatialFunction.h

@@ -89,15 +89,15 @@ class ITK_TEMPLATE_EXPORT GaussianSpatialFunction : public SpatialFunction<TOutp
   itkGetConstMacro(Mean, ArrayType);
 
 protected:
-  GaussianSpatialFunction();
+  GaussianSpatialFunction() = default;
   ~GaussianSpatialFunction() override = default;
   void
   PrintSelf(std::ostream & os, Indent indent) const override;
 
 private:
-  ArrayType m_Sigma{};
+  ArrayType m_Sigma{ ArrayType::Filled(5.0) };
 
-  ArrayType m_Mean{};
+  ArrayType m_Mean{ ArrayType::Filled(10.0) };
 
   double m_Scale{ 1.0 };
 

Modules/Core/Common/include/itkGaussianSpatialFunction.hxx

@@ -23,14 +23,6 @@
 
 namespace itk
 {
-template <typename TOutput, unsigned int VImageDimension, typename TInput>
-GaussianSpatialFunction<TOutput, VImageDimension, TInput>::GaussianSpatialFunction()
-
-{
-  m_Mean = ArrayType::Filled(10.0);
-  m_Sigma = ArrayType::Filled(5.0);
-}
-
 template <typename TOutput, unsigned int VImageDimension, typename TInput>
 auto
 GaussianSpatialFunction<TOutput, VImageDimension, TInput>::Evaluate(const TInput & position) const -> OutputType

Modules/Core/Common/include/itkSphereSpatialFunction.h

@@ -68,7 +68,7 @@ class ITK_TEMPLATE_EXPORT SphereSpatialFunction : public InteriorExteriorSpatial
   itkSetMacro(Radius, double);
 
 protected:
-  SphereSpatialFunction();
+  SphereSpatialFunction() = default;
   ~SphereSpatialFunction() override = default;
   void
   PrintSelf(std::ostream & os, Indent indent) const override;
@@ -78,7 +78,7 @@ class ITK_TEMPLATE_EXPORT SphereSpatialFunction : public InteriorExteriorSpatial
   InputType m_Center{};
 
   /** The radius of the sphere. */
-  double m_Radius{};
+  double m_Radius{ 1.0 };
 };
 } // end namespace itk
 

Modules/Core/Common/include/itkSphereSpatialFunction.hxx

@@ -21,14 +21,6 @@
 
 namespace itk
 {
-template <unsigned int VImageDimension, typename TInput>
-SphereSpatialFunction<VImageDimension, TInput>::SphereSpatialFunction()
-{
-  m_Radius = 1.0;
-
-  m_Center.Fill(0.0f);
-}
-
 template <unsigned int VImageDimension, typename TInput>
 auto
 SphereSpatialFunction<VImageDimension, TInput>::Evaluate(const InputType & position) const -> OutputType