STYLE: Remove IndexType index{0} from region initialization in tests

Removed `IndexType` variables initialized by zero's (`{ 0, ..., 0 }`), that were
only there as the index argument of a region initialization.

Using Notepad++, Replace in Files (Search Mode: Regular expression), doing:

  Find what: `^( [ ]+)constexpr IndexType[ ]+(\w+){[0, ]*};[\r\n]+\1(.*[rR]egion.* \w+)\(\2, (.*)\);$`
  Find what: `^( [ ]+)constexpr IndexType[ ]+(\w+){[0, ]*};[\r\n]+\1(.*[rR]egion.* \w+){ \2, (.*) }];$`
  Find what: `^( [ ]+)constexpr IndexType[ ]+(\w+){[0, ]*};[\r\n]+\1(.*[rR]egion.* \w+) = { \2, (.*) };$`

  Replace with: $1$3{ $4 };

Manually fixed itkCenteredVersorTransformInitializerTest.cxx compile errors
after removing `index`. Removed `IndexType` that have become unused with this
commit.

Follow-up to pull request #5627
commit f9885d2
"STYLE: Remove `T::IndexType index{}` from region initialization in tests"

Author: N-Dekker

Modules/Core/Common/test/itkConstantBoundaryConditionTest.cxx

@@ -121,10 +121,9 @@ int
 itkConstantBoundaryConditionTest(int, char *[])
 {
   // Test an image to cover one operator() method.
-  auto                image = ImageType::New();
-  constexpr SizeType  imageSize{ 5, 5 };
-  constexpr IndexType imageIndex{ 0, 0 };
-  RegionType          imageRegion{ imageIndex, imageSize };
+  auto               image = ImageType::New();
+  constexpr SizeType imageSize{ 5, 5 };
+  RegionType         imageRegion{ imageSize };
   image->SetRegions(imageRegion);
   image->Allocate();
 

Modules/Core/Common/test/itkPeriodicBoundaryConditionTest.cxx

@@ -124,9 +124,8 @@ itkPeriodicBoundaryConditionTest(int, char *[])
   // Test an image to cover one operator() method.
   auto image = ImageType::New();
 
-  constexpr SizeType  imageSize{ 5, 5 };
-  constexpr IndexType imageIndex{ 0, 0 };
-  const RegionType    imageRegion(imageIndex, imageSize);
+  constexpr SizeType imageSize{ 5, 5 };
+  const RegionType   imageRegion{ imageSize };
   image->SetRegions(imageRegion);
   image->Allocate();
 

Modules/Core/Common/test/itkZeroFluxBoundaryConditionTest.cxx

@@ -124,9 +124,8 @@ itkZeroFluxBoundaryConditionTest(int, char *[])
   // Test an image to cover one operator() method.
   auto image = ImageType::New();
 
-  constexpr SizeType  imageSize{ 5, 5 };
-  constexpr IndexType imageIndex{ 0, 0 };
-  const RegionType    imageRegion{ imageIndex, imageSize };
+  constexpr SizeType imageSize{ 5, 5 };
+  const RegionType   imageRegion{ imageSize };
   image->SetRegions(imageRegion);
   image->Allocate();
 

Modules/Filtering/ImageIntensity/test/itkDivideImageFilterTest2.cxx

@@ -40,10 +40,6 @@ itkDivideImageFilterTest2(int, char *[])
   // Declare appropriate Iterator types for each image
   using OutputImageIteratorType = itk::ImageRegionIteratorWithIndex<OutputImageType>;
 
-
-  // Declare the type of the index to access images
-  using IndexType = itk::Index<Dimension>;
-
   // Declare the type of the size
   using SizeType = itk::Size<Dimension>;
 
@@ -55,9 +51,8 @@ itkDivideImageFilterTest2(int, char *[])
   auto inputImageB = InputImageType2::New();
 
   // Define their size, and start index
-  constexpr SizeType  size{ 2, 2, 2 };
-  constexpr IndexType start{ 0, 0, 0 };
-  RegionType          region{ start, size };
+  constexpr SizeType size{ 2, 2, 2 };
+  RegionType         region{ size };
 
   // Initialize Image A
   inputImageA->SetRegions(region);

Modules/Filtering/MathematicalMorphology/test/itkOpeningByReconstructionImageFilterTest2.cxx

@@ -41,7 +41,6 @@ itkOpeningByReconstructionImageFilterTest2(int argc, char * argv[])
   using OutputImageType = itk::Image<PixelType, Dimension>;
   using RegionType = InputImageType::RegionType;
   using SizeType = InputImageType::SizeType;
-  using IndexType = InputImageType::IndexType;
   using SpacingType = InputImageType::SpacingType;
   using OriginType = InputImageType::PointType;
 
@@ -56,9 +55,8 @@ itkOpeningByReconstructionImageFilterTest2(int argc, char * argv[])
   auto inputImage = InputImageType::New();
 
   // Define regions of input image
-  auto                size = SizeType::Filled(std::stoi(argv[2]));
-  constexpr IndexType index{};
-  RegionType          region = { index, size };
+  auto       size = SizeType::Filled(std::stoi(argv[2]));
+  RegionType region{ size };
 
   // fill spacing and origin
   OriginType origin;

Modules/Numerics/Statistics/test/itkGaussianRandomSpatialNeighborSubsamplerTest.cxx

@@ -48,10 +48,9 @@ itkGaussianRandomSpatialNeighborSubsamplerTest(int argc, char * argv[])
   using SamplerType = itk::Statistics::GaussianRandomSpatialNeighborSubsampler<AdaptorType, RegionType>;
   using WriterType = itk::ImageFileWriter<FloatImage>;
 
-  auto                inImage = FloatImage::New();
-  auto                sz = SizeType::Filled(35);
-  constexpr IndexType idx{};
-  const RegionType    region{ idx, sz };
+  auto             inImage = FloatImage::New();
+  auto             sz = SizeType::Filled(35);
+  const RegionType region{ sz };
 
   inImage->SetRegions(region);
   inImage->AllocateInitialized();

Modules/Numerics/Statistics/test/itkSpatialNeighborSubsamplerTest.cxx

@@ -77,10 +77,9 @@ itkSpatialNeighborSubsamplerTest(int, char *[])
   using SamplerType = itk::Statistics::SpatialNeighborSubsampler<AdaptorType, RegionType>;
   using IteratorType = itk::ImageRegionConstIteratorWithIndex<ImageType>;
 
-  auto                inImage = ImageType::New();
-  constexpr auto      sz = SizeType::Filled(25);
-  constexpr IndexType idx{};
-  const RegionType    region{ idx, sz };
+  auto             inImage = ImageType::New();
+  constexpr auto   sz = SizeType::Filled(25);
+  const RegionType region{ sz };
 
   inImage->SetRegions(region);
   inImage->AllocateInitialized();

Modules/Numerics/Statistics/test/itkUniformRandomSpatialNeighborSubsamplerTest.cxx

@@ -52,8 +52,7 @@ itkUniformRandomSpatialNeighborSubsamplerTest(int argc, char * argv[])
   auto                                    inImage = FloatImage::New();
   constexpr typename SizeType::value_type regionSizeVal = 35;
   constexpr auto                          sz = SizeType::Filled(regionSizeVal);
-  constexpr IndexType                     idx{};
-  const RegionType                        region{ idx, sz };
+  const RegionType                        region{ sz };
 
   inImage->SetRegions(region);
   inImage->AllocateInitialized();

Modules/Registration/Common/test/itkCenteredVersorTransformInitializerTest.cxx

@@ -53,13 +53,11 @@ itkCenteredVersorTransformInitializerTest(int, char *[])
   // Transform Type
   using TransformType = itk::VersorRigid3DTransform<double>;
 
-  SizeType            size{ { 100, 100, 150 } };
-  PointType           fixedOrigin{};
-  PointType           movingOrigin{ { 29.0, 17.0, 13.0 } };
-  SpacingType         spacing{ { 1.5, 1.5, 1.0 } };
-  constexpr IndexType index{};
-
-  const RegionType region{ index, size };
+  SizeType         size{ { 100, 100, 150 } };
+  PointType        fixedOrigin{};
+  PointType        movingOrigin{ { 29.0, 17.0, 13.0 } };
+  SpacingType      spacing{ { 1.5, 1.5, 1.0 } };
+  const RegionType region{ size };
 
 
   auto fixedImage = FixedImageType::New();
@@ -79,9 +77,9 @@ itkCenteredVersorTransformInitializerTest(int, char *[])
   SizeType   internalSize;
   IndexType  internalIndex;
 
-  internalIndex[0] = index[0] + 20;
-  internalIndex[1] = index[1] + 30;
-  internalIndex[2] = index[2] + 10;
+  internalIndex[0] = 20;
+  internalIndex[1] = 30;
+  internalIndex[2] = 10;
 
   internalSize[0] = size[0] - 2 * 20;
   internalSize[1] = size[1] - 2 * 30;
@@ -101,9 +99,9 @@ itkCenteredVersorTransformInitializerTest(int, char *[])
   }
 
 
-  internalIndex[0] = index[0] + 10;
-  internalIndex[1] = index[1] + 20;
-  internalIndex[2] = index[2] + 30;
+  internalIndex[0] = 10;
+  internalIndex[1] = 20;
+  internalIndex[2] = 30;
 
   internalSize[0] = size[0] - 2 * 10;
   internalSize[1] = size[1] - 2 * 20;

Modules/Registration/PDEDeformable/test/itkDemonsRegistrationFilterTest.cxx

@@ -116,7 +116,6 @@ itkDemonsRegistrationFilterTest(int, char *[])
   using ImageType = itk::Image<PixelType, ImageDimension>;
   using VectorType = itk::Vector<float, ImageDimension>;
   using FieldType = itk::Image<VectorType, ImageDimension>;
-  using IndexType = ImageType::IndexType;
   using SizeType = ImageType::SizeType;
   using RegionType = ImageType::RegionType;
 
@@ -126,9 +125,7 @@ itkDemonsRegistrationFilterTest(int, char *[])
   SizeType                 size;
   size.SetSize(sizeArray);
 
-  constexpr IndexType index{};
-
-  const RegionType region{ index, size };
+  const RegionType region{ size };
 
   auto moving = ImageType::New();
   auto fixed = ImageType::New();