STYLE: Prefer C++11 type alias over typedef

== http://en.cppreference.com/w/cpp/language/type_alias ==

Type alias is a name that refers to a previously defined type (similar
to typedef).

A type alias declaration introduces a name which can be used as a
synonym for the type denoted by type-id. It does not introduce a new
type and it cannot change the meaning of an existing type name. There is
no difference between a type alias declaration and typedef declaration.
This declaration may appear in block scope, class scope, or namespace
scope.

== https://www.quora.com/Is-using-typedef-in-C++-considered-a-bad-practice ==

While typedef is still available for backward compatibility, the new
Type Alias syntax 'using Alias = ExistingLongName;' is more consistent
with the flow of C++ than the old typedef syntax 'typedef
ExistingLongName Alias;', and it also works for templates (Type alias,
alias template (since C++11)), so leftover 'typedef' aliases will differ
in style from any alias templates.

include/itkAdditiveGaussianNoiseMeshFilter.h

@@ -44,19 +44,19 @@ public MeshToMeshFilter< TInput, TOutput >
 
 public:
 
-  /** Standard class typedefs. */
-  typedef AdditiveGaussianNoiseMeshFilter     Self;
-  typedef MeshToMeshFilter< TInput, TOutput > Superclass;
-  typedef SmartPointer< Self >                Pointer;
-  typedef SmartPointer< const Self >          ConstPointer;
+  /** Standard class type alias. */
+  using Self = AdditiveGaussianNoiseMeshFilter;
+  using Superclass = MeshToMeshFilter< TInput, TOutput >;
+  using Pointer = SmartPointer< Self >;
+  using ConstPointer = SmartPointer< const Self >;
 
-  typedef TInput                           InputMeshType;
-  typedef TOutput                          OutputMeshType;
-  typedef typename InputMeshType::Pointer  InputMeshPointer;
-  typedef typename OutputMeshType::Pointer OutputMeshPointer;
+  using InputMeshType = TInput;
+  using OutputMeshType = TOutput;
+  using InputMeshPointer = typename InputMeshType::Pointer;
+  using OutputMeshPointer = typename OutputMeshType::Pointer;
 
   /** Type for representing coordinates. */
-  typedef typename TInput::CoordRepType CoordRepType;
+  using CoordRepType = typename TInput::CoordRepType;
 
   /** Method for creation through the object factory. */
   itkNewMacro(Self);

include/itkAdditiveGaussianNoiseMeshFilter.hxx

@@ -48,11 +48,11 @@ void
 AdditiveGaussianNoiseMeshFilter< TInputMesh, TOutputMesh >
 ::GenerateData(void)
 {
-  typedef typename TInputMesh::PointsContainer  InputPointsContainer;
-  typedef typename TOutputMesh::PointsContainer OutputPointsContainer;
+  using InputPointsContainer = typename TInputMesh::PointsContainer;
+  using OutputPointsContainer = typename TOutputMesh::PointsContainer;
 
-  typedef typename TInputMesh::PointsContainerConstPointer InputPointsContainerConstPointer;
-  typedef typename TOutputMesh::PointsContainerPointer     OutputPointsContainerPointer;
+  using InputPointsContainerConstPointer = typename TInputMesh::PointsContainerConstPointer;
+  using OutputPointsContainerPointer = typename TOutputMesh::PointsContainerPointer;
 
   const InputMeshType *inputMesh   =  this->GetInput();
   OutputMeshPointer    outputMesh   =  this->GetOutput();
@@ -82,7 +82,7 @@ AdditiveGaussianNoiseMeshFilter< TInputMesh, TOutputMesh >
 
   unsigned int maxDimension = TInputMesh::MaxTopologicalDimension;
 
-  typedef itk::Statistics::NormalVariateGenerator GeneratorType;
+  using GeneratorType = itk::Statistics::NormalVariateGenerator;
   GeneratorType::Pointer generator = GeneratorType::New();
   generator->Initialize( this->m_Seed );
 

include/itkAdditiveGaussianNoiseQuadEdgeMeshFilter.h

@@ -42,14 +42,14 @@ class AdditiveGaussianNoiseQuadEdgeMeshFilter:
   public QuadEdgeMeshToQuadEdgeMeshFilter< TInputMesh, TOutputMesh >
 {
 public:
-  /** Standard class typedefs. */
-  typedef AdditiveGaussianNoiseQuadEdgeMeshFilter                     Self;
-  typedef QuadEdgeMeshToQuadEdgeMeshFilter< TInputMesh, TOutputMesh > Superclass;
-  typedef SmartPointer< Self >                                        Pointer;
-  typedef SmartPointer< const Self >                                  ConstPointer;
+  /** Standard class type alias. */
+  using Self = AdditiveGaussianNoiseQuadEdgeMeshFilter;
+  using Superclass = QuadEdgeMeshToQuadEdgeMeshFilter< TInputMesh, TOutputMesh >;
+  using Pointer = SmartPointer< Self >;
+  using ConstPointer = SmartPointer< const Self >;
 
   /** Type for representing coordinates. */
-  typedef typename TInputMesh::CoordRepType CoordRepType;
+  using CoordRepType = typename TInputMesh::CoordRepType;
 
   /** Method for creation through the object factory. */
   itkNewMacro(Self);

include/itkAdditiveGaussianNoiseQuadEdgeMeshFilter.hxx

@@ -56,7 +56,7 @@ AdditiveGaussianNoiseQuadEdgeMeshFilter< TInputMesh, TOutputMesh >
   typename TOutputMesh::PointsContainer::Iterator it =
     outputMesh->GetPoints()->Begin();
 
-  typedef itk::Statistics::NormalVariateGenerator GeneratorType;
+  using GeneratorType = itk::Statistics::NormalVariateGenerator;
   GeneratorType::Pointer generator = GeneratorType::New();
   generator->Initialize( this->m_Seed );
 

test/itkAdditiveGaussianNoiseMeshFilterTest.cxx

@@ -24,16 +24,16 @@ int
 itkAdditiveGaussianNoiseMeshFilterTest(int itkNotUsed(argc), char * itkNotUsed(argv) [])
 {
 
-  typedef double     TPixel;
+  using TPixel = double;
   const unsigned int Dimension = 3;
 
   //////////////
   // Typedefs //
   //////////////
 
-  typedef itk::Mesh< TPixel, Dimension >                TMesh;
-  typedef itk::RegularSphereMeshSource< TMesh >         TSphere;
-  typedef itk::AdditiveGaussianNoiseMeshFilter< TMesh > TNoise;
+  using TMesh = itk::Mesh< TPixel, Dimension >;
+  using TSphere = itk::RegularSphereMeshSource< TMesh >;
+  using TNoise = itk::AdditiveGaussianNoiseMeshFilter< TMesh >;
 
   ////////////////
   // Parameters //

test/itkAdditiveGaussianNoiseQuadEdgeMeshFilterTest.cxx

@@ -24,16 +24,16 @@ int
 itkAdditiveGaussianNoiseQuadEdgeMeshFilterTest(int itkNotUsed(argc), char * itkNotUsed(argv) [])
 {
 
-  typedef double     TPixel;
+  using TPixel = double;
   const unsigned int Dimension = 3;
 
   //////////////
   // Typedefs //
   //////////////
 
-  typedef itk::QuadEdgeMesh< TPixel, Dimension >                TMesh;
-  typedef itk::RegularSphereMeshSource< TMesh >                 TSphere;
-  typedef itk::AdditiveGaussianNoiseQuadEdgeMeshFilter< TMesh > TNoise;
+  using TMesh = itk::QuadEdgeMesh< TPixel, Dimension >;
+  using TSphere = itk::RegularSphereMeshSource< TMesh >;
+  using TNoise = itk::AdditiveGaussianNoiseQuadEdgeMeshFilter< TMesh >;
 
   ////////////////
   // Parameters //