STYLE: Use default member initialization

Converts a default constructor’s member initializers into the new
default member initializers in C++11. Other member initializers that match the
default member initializer are removed. This can reduce repeated code or allow
use of ‘= default’.

Modules/Filtering/FFT/include/itkComplexToComplex1DFFTImageFilter.h

@@ -105,10 +105,10 @@ class ITK_TEMPLATE_EXPORT ComplexToComplex1DFFTImageFilter : public ImageToImage
 
   /** Direction in which the filter is to be applied
    * this should be in the range [0,ImageDimension-1]. */
-  unsigned int m_Direction;
+  unsigned int m_Direction{ 0 };
 
   /** Direction to apply the transform (forward/inverse). */
-  TransformDirectionType m_TransformDirection;
+  TransformDirectionType m_TransformDirection{ DIRECT };
 
 private:
 };

Modules/Filtering/FFT/include/itkComplexToComplex1DFFTImageFilter.hxx

@@ -26,8 +26,6 @@ namespace itk
 {
 template <typename TInputImage, typename TOutputImage>
 ComplexToComplex1DFFTImageFilter<TInputImage, TOutputImage>::ComplexToComplex1DFFTImageFilter()
-  : m_Direction(0)
-  , m_TransformDirection(DIRECT)
 {}
 
 

Modules/Filtering/FFT/include/itkFFTWComplexToComplex1DFFTImageFilter.h

@@ -94,9 +94,9 @@ class ITK_TEMPLATE_EXPORT FFTWComplexToComplex1DFFTImageFilter
   void
   DestroyPlans();
 
-  bool                  m_PlanComputed;
+  bool                  m_PlanComputed{ false };
   PlanArrayType         m_PlanArray;
-  unsigned int          m_LastImageSize;
+  unsigned int          m_LastImageSize{ 0 };
   PlanBufferPointerType m_InputBufferArray;
   PlanBufferPointerType m_OutputBufferArray;
 };

Modules/Filtering/FFT/include/itkFFTWComplexToComplex1DFFTImageFilter.hxx

@@ -33,8 +33,7 @@ namespace itk
 
 template <typename TInputImage, typename TOutputImage>
 FFTWComplexToComplex1DFFTImageFilter<TInputImage, TOutputImage>::FFTWComplexToComplex1DFFTImageFilter()
-  : m_PlanComputed(false)
-  , m_LastImageSize(0)
+
 {
   // We cannot split over the FFT direction
   this->m_ImageRegionSplitter = ImageRegionSplitterDirection::New();

Modules/Filtering/FFT/include/itkFFTWForward1DFFTImageFilter.h

@@ -93,9 +93,9 @@ class ITK_TEMPLATE_EXPORT FFTWForward1DFFTImageFilter : public Forward1DFFTImage
   void
   DestroyPlans();
 
-  bool                  m_PlanComputed;
+  bool                  m_PlanComputed{ false };
   PlanArrayType         m_PlanArray;
-  unsigned int          m_LastImageSize;
+  unsigned int          m_LastImageSize{ 0 };
   PlanBufferPointerType m_InputBufferArray;
   PlanBufferPointerType m_OutputBufferArray;
 };

Modules/Filtering/FFT/include/itkFFTWForward1DFFTImageFilter.hxx

@@ -33,8 +33,7 @@ namespace itk
 
 template <typename TInputImage, typename TOutputImage>
 FFTWForward1DFFTImageFilter<TInputImage, TOutputImage>::FFTWForward1DFFTImageFilter()
-  : m_PlanComputed(false)
-  , m_LastImageSize(0)
+
 {
   // We cannot split over the FFT direction
   this->m_ImageRegionSplitter = ImageRegionSplitterDirection::New();

Modules/Filtering/FFT/include/itkFFTWInverse1DFFTImageFilter.h

@@ -92,9 +92,9 @@ class ITK_TEMPLATE_EXPORT FFTWInverse1DFFTImageFilter : public Inverse1DFFTImage
   void
   DestroyPlans();
 
-  bool                  m_PlanComputed;
+  bool                  m_PlanComputed{ false };
   PlanArrayType         m_PlanArray;
-  unsigned int          m_LastImageSize;
+  unsigned int          m_LastImageSize{ 0 };
   PlanBufferPointerType m_InputBufferArray;
   PlanBufferPointerType m_OutputBufferArray;
 };

Modules/Filtering/FFT/include/itkFFTWInverse1DFFTImageFilter.hxx

@@ -34,8 +34,7 @@ namespace itk
 
 template <typename TInputImage, typename TOutputImage>
 FFTWInverse1DFFTImageFilter<TInputImage, TOutputImage>::FFTWInverse1DFFTImageFilter()
-  : m_PlanComputed(false)
-  , m_LastImageSize(0)
+
 {
   // We cannot split over the FFT direction
   this->m_ImageRegionSplitter = ImageRegionSplitterDirection::New();

Modules/Filtering/FFT/include/itkForward1DFFTImageFilter.h

@@ -96,7 +96,7 @@ class ITK_TEMPLATE_EXPORT Forward1DFFTImageFilter : public ImageToImageFilter<TI
 private:
   /** Direction in which the filter is to be applied
    * this should be in the range [0,ImageDimension-1]. */
-  unsigned int m_Direction;
+  unsigned int m_Direction{ 0 };
 };
 } // namespace itk
 

Modules/Filtering/FFT/include/itkForward1DFFTImageFilter.hxx

@@ -25,7 +25,7 @@ namespace itk
 {
 template <typename TInputImage, typename TOutputImage>
 Forward1DFFTImageFilter<TInputImage, TOutputImage>::Forward1DFFTImageFilter()
-  : m_Direction(0)
+
 {}
 
 

Modules/Filtering/FFT/include/itkInverse1DFFTImageFilter.h

@@ -89,7 +89,7 @@ class ITK_TEMPLATE_EXPORT Inverse1DFFTImageFilter : public ImageToImageFilter<TI
 
   /** Direction in which the filter is to be applied
    * this should be in the range [0,ImageDimension-1]. */
-  unsigned int m_Direction;
+  unsigned int m_Direction{ 0 };
 
 private:
 };

Modules/Filtering/FFT/include/itkInverse1DFFTImageFilter.hxx

@@ -26,7 +26,7 @@ namespace itk
 {
 template <typename TInputImage, typename TOutputImage>
 Inverse1DFFTImageFilter<TInputImage, TOutputImage>::Inverse1DFFTImageFilter()
-  : m_Direction(0)
+
 {}
 
 

Modules/Registration/Common/include/itkMatchCardinalityImageToImageMetric.h

@@ -174,13 +174,14 @@ class ITK_TEMPLATE_EXPORT MatchCardinalityImageToImageMetric : public ImageToIma
   };
 
 private:
-  bool                       m_MeasureMatches;
+  // default to measure percentage of pixel matches
+  bool                       m_MeasureMatches{ true };
   std::vector<MeasureType>   m_ThreadMatches;
   std::vector<SizeValueType> m_ThreadCounts;
 
   /** Support processing data in multiple threads. Used by subclasses
    * (e.g., ImageSource). */
-  MultiThreaderBase::Pointer m_Threader;
+  MultiThreaderBase::Pointer m_Threader{ MultiThreaderBase::New() };
 };
 } // end namespace itk
 

Modules/Registration/Common/include/itkMatchCardinalityImageToImageMetric.hxx

@@ -30,10 +30,6 @@ template <typename TFixedImage, typename TMovingImage>
 MatchCardinalityImageToImageMetric<TFixedImage, TMovingImage>::MatchCardinalityImageToImageMetric()
 {
   this->SetComputeGradient(false); // don't use the default gradients
-  m_MeasureMatches = true;         // default to measure percentage of pixel
-                                   // matches
-
-  m_Threader = MultiThreaderBase::New();
 }
 
 /*