STYLE: Replace Fill(0) with {} initializer

- Follow-up to ITK pull request InsightSoftwareConsortium/ITK#4897
commit InsightSoftwareConsortium/ITK@4733550

Author: N-Dekker

src/Core/Common/ApplyAFilterOnlyToASpecifiedRegionOfAnImage/Code.cxx

@@ -31,8 +31,7 @@ main()
   ImageType::SizeType smallSize;
   smallSize.Fill(10);
 
-  ImageType::IndexType index;
-  index.Fill(0);
+  ImageType::IndexType index{};
 
   ImageType::RegionType region(index, smallSize);
 

src/Core/Common/ConvertArrayToImage/Code.cxx

@@ -35,8 +35,7 @@ main()
   size[1] = 200; // size along Y
   size[2] = 200; // size along Z
 
-  ImportFilterType::IndexType start;
-  start.Fill(0);
+  ImportFilterType::IndexType start{};
 
   ImportFilterType::RegionType region;
   region.SetIndex(start);

src/Core/Common/CreateAnotherInstanceOfAFilter/Code.cxx

@@ -24,8 +24,7 @@ void
 CreateImage(typename TImage::Pointer image)
 {
   using ImageType = TImage;
-  typename ImageType::IndexType start;
-  start.Fill(0);
+  typename ImageType::IndexType start{};
 
   typename ImageType::SizeType size;
   size.Fill(2);
@@ -55,8 +54,7 @@ main()
   filter2->SetInput(image);
   filter2->Update();
 
-  itk::Index<Dimension> index;
-  index.Fill(0);
+  itk::Index<Dimension> index{};
 
   std::cout << filter2->GetOutput()->GetPixel(index) << std::endl;
 

src/Core/Common/CreateVectorImage/Code.cxx

@@ -23,8 +23,7 @@ main()
   // Create an image
   using ImageType = itk::VectorImage<float, 2>;
 
-  ImageType::IndexType start;
-  start.Fill(0);
+  ImageType::IndexType start{};
 
   ImageType::SizeType size;
   size.Fill(2);

src/Core/Common/CropImageBySpecifyingRegion/Code.cxx

@@ -25,8 +25,7 @@ main()
 {
   using ImageType = itk::Image<unsigned char, 2>;
 
-  ImageType::IndexType start;
-  start.Fill(0);
+  ImageType::IndexType start{};
 
   ImageType::SizeType size;
   size.Fill(10);

src/Core/Common/ImageRegionOverlap/Code.cxx

@@ -88,19 +88,15 @@ main(int argc, char * argv[])
   regionC.Crop(regionB);
   regionC.PadByRadius(10);
 
-  RGBPixelType pix_black;
-  pix_black.Fill(0);
+  RGBPixelType pix_black{};
 
-  RGBPixelType pix_red;
-  pix_red.Fill(0);
+  RGBPixelType pix_red{};
   pix_red[0] = 255;
 
-  RGBPixelType pix_green;
-  pix_green.Fill(0);
+  RGBPixelType pix_green{};
   pix_green[1] = 255;
 
-  RGBPixelType pix_blue;
-  pix_blue.Fill(0);
+  RGBPixelType pix_blue{};
   pix_blue[2] = 255;
 
   // A black canvas

src/Core/Common/ImportPixelBufferIntoAnImage/Code.cxx

@@ -48,8 +48,7 @@ main(int argc, char * argv[])
   size[0] = 200; // size along X
   size[1] = 200; // size along Y
 
-  ImportFilterType::IndexType start;
-  start.Fill(0);
+  ImportFilterType::IndexType start{};
 
   ImportFilterType::RegionType region;
   region.SetIndex(start);

src/Core/Common/IsPixelInsideRegion/Code.cxx

@@ -32,8 +32,7 @@ main()
   SizeType size;
   size.Fill(3);
 
-  IndexType start;
-  start.Fill(0);
+  IndexType start{};
 
   RegionType region(start, size);
 

src/Core/Common/IterateImageStartingAtSeed/Code.cxx

@@ -59,8 +59,7 @@ main(int /*argc*/, char * /*argv*/[])
 void
 CreateImage(ImageType::Pointer image)
 {
-  itk::Index<2> start;
-  start.Fill(0);
+  itk::Index<2> start{};
 
   itk::Size<2> size;
   size.Fill(100);

src/Core/Common/IterateLineThroughImage/Code.cxx

@@ -91,8 +91,7 @@ CreateImage(ImageType::Pointer image)
   ImageType::SizeType regionSize;
   regionSize.Fill(100);
 
-  ImageType::IndexType regionIndex;
-  regionIndex.Fill(0);
+  ImageType::IndexType regionIndex{};
 
   ImageType::RegionType region;
   region.SetSize(regionSize);