STYLE: Simplify code by ProcessObject::SetRequiredOutputs(*this, 3)

Reduced amount of duplicate code.

Author: N-Dekker

Modules/Filtering/DistanceMap/include/itkDanielssonDistanceMapImageFilter.hxx

@@ -30,16 +30,8 @@ namespace itk
 template <typename TInputImage, typename TOutputImage, typename TVoronoiImage>
 DanielssonDistanceMapImageFilter<TInputImage, TOutputImage, TVoronoiImage>::DanielssonDistanceMapImageFilter()
 {
-  this->SetNumberOfRequiredOutputs(3);
-
-  // distance map
-  this->SetNthOutput(0, this->MakeOutput(0));
-
-  // voronoi map
-  this->SetNthOutput(1, this->MakeOutput(1));
-
-  // distance vectors
-  this->SetNthOutput(2, this->MakeOutput(2));
+  // distance map, voronoi map, distance vectors
+  ProcessObject::SetRequiredOutputs(*this, 3);
 
   m_SquaredDistance = false;
   m_InputIsBinary = false;

Modules/Filtering/DistanceMap/include/itkSignedDanielssonDistanceMapImageFilter.hxx

@@ -32,16 +32,8 @@ template <typename TInputImage, typename TOutputImage, typename TVoronoiImage>
 SignedDanielssonDistanceMapImageFilter<TInputImage, TOutputImage, TVoronoiImage>::
   SignedDanielssonDistanceMapImageFilter()
 {
-  this->SetNumberOfRequiredOutputs(3);
-
-  // distance map
-  this->SetNthOutput(0, static_cast<OutputImageType *>(this->MakeOutput(0).GetPointer()));
-
-  // voronoi map
-  this->SetNthOutput(1, static_cast<VoronoiImageType *>(this->MakeOutput(1).GetPointer()));
-
-  // distance vectors
-  this->SetNthOutput(2, static_cast<VectorImageType *>(this->MakeOutput(2).GetPointer()));
+  // distance map, voronoi map, distance vectors
+  ProcessObject::SetRequiredOutputs(*this, 3);
 
   // Default values
   this->m_SquaredDistance = false; // Should we remove this ?

Modules/Numerics/Eigen/include/itkEigenAnalysis2DImageFilter.hxx

@@ -28,10 +28,7 @@ template <typename TInputImage, typename TEigenValueImage, typename TEigenVector
 EigenAnalysis2DImageFilter<TInputImage, TEigenValueImage, TEigenVectorImage>::EigenAnalysis2DImageFilter()
 {
   this->SetNumberOfRequiredInputs(3);
-  this->SetNumberOfRequiredOutputs(3);
-  this->SetNthOutput(0, this->MakeOutput(0));
-  this->SetNthOutput(1, this->MakeOutput(1));
-  this->SetNthOutput(2, this->MakeOutput(2));
+  ProcessObject::SetRequiredOutputs(*this, 3);
   static_assert(EigenVectorType::Dimension == 2, "Error: PixelType of EigenVector Image must have exactly 2 elements!");
 }
 

Modules/Segmentation/Watersheds/include/itkWatershedSegmenter.hxx

@@ -1354,13 +1354,9 @@ Segmenter<TInputImage>::Segmenter()
   m_SortEdgeLists = true;
   m_Connectivity.direction = nullptr;
   m_Connectivity.index = nullptr;
-  typename OutputImageType::Pointer  img = static_cast<OutputImageType *>(this->MakeOutput(0).GetPointer());
-  typename SegmentTableType::Pointer st = static_cast<SegmentTableType *>(this->MakeOutput(1).GetPointer());
-  typename BoundaryType::Pointer     bd = static_cast<BoundaryType *>(this->MakeOutput(2).GetPointer());
-  this->SetNumberOfRequiredOutputs(3);
-  this->ProcessObject::SetNthOutput(0, img.GetPointer());
-  this->ProcessObject::SetNthOutput(1, st.GetPointer());
-  this->ProcessObject::SetNthOutput(2, bd.GetPointer());
+
+  // OutputImage, SegmentTable, Boundary
+  ProcessObject::SetRequiredOutputs(*this, 3);
 
   // Allocate memory for connectivity
   m_Connectivity.size = 2 * ImageDimension;