COMP: Use C++11 nullptr directly

git grep -l "ITK_NULLPTR" |   fgrep -v itk_compiler_detection.h | fgrep -v itkMacro.h | fgrep -v CMakeLists.txt |fgrep -v .cmake |   xargs sed -i '' -e "s/ITK_NULLPTR/nullptr/g"

Change-Id: I8646354381b2e6f50527993b610208d4715ef26c

Author: hjmjohnson

Examples/RegistrationITKv3/ImageRegistrationHistogramPlotter.cxx

@@ -412,7 +412,7 @@ class CommandIterationUpdate : public itk::Command
   void Execute(const itk::Object * object, const itk::EventObject & event)
     {
     OptimizerPointer optimizer = static_cast< OptimizerPointer >( object );
-    if( ! itk::IterationEvent().CheckEvent( &event ) || optimizer == ITK_NULLPTR )
+    if( ! itk::IterationEvent().CheckEvent( &event ) || optimizer == nullptr )
       {
       return;
       }

Modules/Core/ImageFunction/include/itkNeighborhoodOperatorImageFunction.hxx

@@ -51,7 +51,7 @@ NeighborhoodOperatorImageFunction< TInputImage, TOutput >
   NeighborhoodInnerProduct< InputImageType, TOutput, TOutput > smartInnerProduct;
 
   const TInputImage* const image = this->GetInputImage();
-  assert(image != ITK_NULLPTR);
+  assert(image != nullptr);
   ConstNeighborhoodIterator< InputImageType > bit( m_Operator.GetRadius(), image, image->GetRequestedRegion() );
   bit.SetLocation(index);
 

Modules/Core/Transform/include/itkv3Rigid3DTransform.h

@@ -120,7 +120,7 @@ class ITK_TEMPLATE_EXPORT Rigid3DTransform:
   InverseTransformBasePointer GetInverseTransform() const ITK_OVERRIDE
   {
   Pointer inv = New();
-  return this->GetInverse(inv) ? inv.GetPointer() : ITK_NULLPTR;
+  return this->GetInverse(inv) ? inv.GetPointer() : nullptr;
   }
 
 protected: