COMP: address warnings about bracket initialization

Addresses warning of the following type:
itkFirstOrderTextureFeaturesImageFilterGTest.cxx:92:31: warning:
suggest braces around initialization of subobject [-Wmissing-braces]
  ImageType::IndexType idx = {r,r};

Author: blowekamp

test/itkFirstOrderTextureFeaturesImageFilterGTest.cxx

@@ -50,7 +50,7 @@ TEST(TextTureFeatures, FirstOrder_Test1)
 
   unsigned int r = 50u;
   unsigned int d = r*2 + 1;
-  ImageType::SizeType imageSize = { d, d };
+  ImageType::SizeType imageSize = {{ d, d }};
   ImageType::SpacingValueType imageSpacing[]  = { 1.0f, 1.0f };
 
   ImageType::Pointer image = ImageType::New();
@@ -80,16 +80,16 @@ TEST(TextTureFeatures, FirstOrder_Test1)
   FilterWatcher watcher(filter, "filter");
 
 
-  ImageType::SizeType requestSize = {10,10};
-  ImageType::IndexType requestIndex = {45,45};
+  ImageType::SizeType requestSize = {{10,10}};
+  ImageType::IndexType requestIndex = {{45,45}};
   ImageType::RegionType request(requestIndex, requestSize);
   filter->GetOutput()->SetRequestedRegion( request );
   filter->Update();
 
   OImageType::ConstPointer output = filter->GetOutput();
 
   {
-  ImageType::IndexType idx = {r,r};
+  ImageType::IndexType idx = {{r,r}};
   const OImageType::PixelType &p = output->GetPixel(idx);
 
   print_feature( p );
@@ -120,7 +120,7 @@ TEST(TextTureFeatures, FirstOrder_Test2)
 
   unsigned int r = 50u;
   unsigned int d = r*2 + 1;
-  ImageType::SizeType imageSize = { d, d };
+  ImageType::SizeType imageSize = {{ d, d }};
   ImageType::SpacingValueType imageSpacing[]  = { 1.0f, 1.0f };
 
   ImageType::Pointer image = ImageType::New();
@@ -150,16 +150,16 @@ TEST(TextTureFeatures, FirstOrder_Test2)
   FilterWatcher watcher(filter, "filter");
 
 
-  ImageType::SizeType requestSize = {10,10};
-  ImageType::IndexType requestIndex = {45,45};
+  ImageType::SizeType requestSize = {{10,10}};
+  ImageType::IndexType requestIndex = {{45,45}};
   ImageType::RegionType request(requestIndex, requestSize);
   filter->GetOutput()->SetRequestedRegion( request );
   filter->Update();
 
   OImageType::ConstPointer output = filter->GetOutput();
 
   {
-  ImageType::IndexType idx = {r,r};
+  ImageType::IndexType idx = {{r,r}};
   const OImageType::PixelType &p = output->GetPixel(idx);
 
   print_feature( p );