update the cxx tests to use nullptr instead of 0/NULL

updating the tests to follow modern standards

Charts/Core/Testing/Cxx/TestBarGraph.cxx

@@ -73,7 +73,7 @@ int TestBarGraph(int , char * [])
   }
 
   // Add multiple bar plots, setting the colors etc
-  vtkPlot *plot = 0;
+  vtkPlot *plot = nullptr;
 
   plot = chart->AddPlot(vtkChart::BAR);
   plot->SetInputData(table.GetPointer(), 0, 1);

Charts/Core/Testing/Cxx/TestBarGraphHorizontal.cxx

@@ -72,8 +72,8 @@ int TestBarGraphHorizontal(int , char * [])
   }
 
   // Add multiple bar plots, setting the colors etc
-  vtkPlot *plot = 0;
-  vtkPlotBar* barPlot = 0;
+  vtkPlot *plot = nullptr;
+  vtkPlotBar* barPlot = nullptr;
 
   plot = chart->AddPlot(vtkChart::BAR);
   barPlot = vtkPlotBar::SafeDownCast(plot);

Charts/Core/Testing/Cxx/TestBarGraphSelection.cxx

@@ -80,7 +80,7 @@ int TestBarGraphSelection(int , char * [])
   selection->InsertNextValue(5);
 
   // Add multiple bar plots, setting the colors etc
-  vtkPlot *plot = 0;
+  vtkPlot *plot = nullptr;
 
   plot = chart->AddPlot(vtkChart::BAR);
   plot->SetInputData(table.GetPointer(), 0, 1);

Charts/Core/Testing/Cxx/TestMultipleScalarsToColors.cxx

@@ -56,7 +56,7 @@ int TestMultipleScalarsToColors(int , char * [])
     0.5,0.5,1.0,1.0};
 
   // Save one of the context actors
-  vtkContextActor *actor = 0;
+  vtkContextActor *actor = nullptr;
 
   // Lookup Table
   vtkSmartPointer<vtkLookupTable> lookupTable =

Charts/Core/Testing/Cxx/TestStackedBarGraph.cxx

@@ -111,7 +111,7 @@ int TestStackedBarGraph(int , char * [])
   colorSeries1->SetColorScheme(vtkColorSeries::WILD_FLOWER);
 
   // Add multiple line plots, setting the colors etc
-  vtkPlotBar *bar = 0;
+  vtkPlotBar *bar = nullptr;
 
   bar = vtkPlotBar::SafeDownCast(chart->AddPlot(vtkChart::BAR));
   bar->SetColorSeries(colorSeries1);

Charts/Core/Testing/Cxx/TestStackedPlot.cxx

@@ -108,7 +108,7 @@ int TestStackedPlot(int , char * [])
   chart->SetShowLegend(true);
 
   // Add multiple line plots, setting the colors etc
-  vtkPlotStacked *stack = 0;
+  vtkPlotStacked *stack = nullptr;
 
   // Books
   stack = vtkPlotStacked::SafeDownCast(chart->AddPlot(vtkChart::STACKED));

Common/ComputationalGeometry/Testing/Cxx/UnitTestParametricSpline.cxx

@@ -196,7 +196,7 @@ int TestErrors()
   x[0] = 0.0; x[1] = 0.0; x[2] = 0.0;
   double result[3];
 
-  pspline->Evaluate(x, result, 0);
+  pspline->Evaluate(x, result, nullptr);
   // Check for model bounds error
   if (errorObserver->GetError())
   {
@@ -211,7 +211,7 @@ int TestErrors()
   errorObserver->Clear();
 
   pspline->SetNumberOfPoints(0);
-  pspline->EvaluateScalar(x, 0, 0);
+  pspline->EvaluateScalar(x, nullptr, nullptr);
   if (errorObserver->GetError())
   {
     std::cout << "Caught expected error: "
@@ -225,7 +225,7 @@ int TestErrors()
   errorObserver->Clear();
 
   pspline->SetXSpline(nullptr);
-  pspline->Evaluate(x, result, 0);
+  pspline->Evaluate(x, result, nullptr);
   if (errorObserver->GetError())
   {
     std::cout << "Caught expected error: "

Common/Core/Testing/Cxx/TestCollection.cxx

@@ -44,7 +44,7 @@ static bool IsEqual(vtkCollection* collection, const std::vector<vtkSmartPointer
   {
     return false;
   }
-  vtkIntArray* dataArray = 0;
+  vtkIntArray* dataArray = nullptr;
   vtkCollectionSimpleIterator it;
   int i = 0;
   for (collection->InitTraversal(it);
@@ -69,14 +69,14 @@ bool TestRegister()
     std::cout << object->GetReferenceCount() << std::endl;
     return false;
   }
-  object->Register(0);
+  object->Register(nullptr);
   collection->RemoveItem(object);
   if (object->GetReferenceCount() != 1)
   {
     std::cout << object->GetReferenceCount() << std::endl;
     return false;
   }
-  object->UnRegister(0);
+  object->UnRegister(nullptr);
   return true;
 }
 

Common/Core/Testing/Cxx/TestGarbageCollector.cxx

@@ -51,7 +51,7 @@ protected:
     if(this->Other)
     {
       this->Other->UnRegister(this);
-      this->Other = 0;
+      this->Other = nullptr;
     }
   }
 

Common/Core/Testing/Cxx/TestNew.cxx

@@ -40,24 +40,24 @@ int TestNew(int,char *[])
 
   vtkWeakPointer<vtkFloatArray> wf;
   // Test scoping, and deletion.
-  if (wf == 0)
+  if (wf == nullptr)
   {
     vtkNew<vtkFloatArray> f;
     wf = f.GetPointer();
   }
-  if (wf != 0)
+  if (wf != nullptr)
   {
     error = true;
     cerr << "Error, vtkNew failed to delete the object it contained."
          << endl;
   }
   // Test implicit conversion vtkNew::operator T* () const
-  if (wf == 0)
+  if (wf == nullptr)
   {
     vtkNew<vtkFloatArray> f;
     wf = f;
   }
-  if (wf != 0)
+  if (wf != nullptr)
   {
     error = true;
     cerr << "Error, vtkNew failed to delete the object it contained (implicit cast to raw pointer)."
@@ -66,7 +66,7 @@ int TestNew(int,char *[])
 
   // Now test interaction with the smart pointer.
   vtkSmartPointer<vtkIntArray> si;
-  if (si == 0)
+  if (si == nullptr)
   {
     vtkNew<vtkIntArray> i;
     si = i.Get();

Common/Core/Testing/Cxx/TestSmartPointer.cxx

@@ -61,12 +61,12 @@ int TestSmartPointer(int,char *[])
   testbits = (testbits << 1) | ((da2 <= ia) ? 1 : 0);
   testbits = (testbits << 1) | ((da2 > ia) ? 1 : 0);
   testbits = (testbits << 1) | ((da2 >= ia) ? 1 : 0);
-  testbits = (testbits << 1) | ((da1 == 0) ? 1 : 0);
-  testbits = (testbits << 1) | ((da1 != 0) ? 1 : 0);
-  testbits = (testbits << 1) | ((da1 < 0) ? 1 : 0);
-  testbits = (testbits << 1) | ((da1 <= 0) ? 1 : 0);
-  testbits = (testbits << 1) | ((da1 > 0) ? 1 : 0);
-  testbits = (testbits << 1) | ((da1 >= 0) ? 1 : 0);
+  testbits = (testbits << 1) | ((da1 == nullptr) ? 1 : 0);
+  testbits = (testbits << 1) | ((da1 != nullptr) ? 1 : 0);
+  testbits = (testbits << 1) | ((da1 < nullptr) ? 1 : 0);
+  testbits = (testbits << 1) | ((da1 <= nullptr) ? 1 : 0);
+  testbits = (testbits << 1) | ((da1 > nullptr) ? 1 : 0);
+  testbits = (testbits << 1) | ((da1 >= nullptr) ? 1 : 0);
   if (testbits != correctbits)
   {
     unsigned int diffbits = (testbits ^ correctbits);

Common/Core/Testing/Cxx/TestSystemInformation.cxx

@@ -82,7 +82,7 @@ int TestSystemInformation(int argc, char* argv[])
     "Common/Core/vtkToolkits.h",
     "VTKConfig.cmake",
     "Testing/Temporary/ConfigSummary.txt",
-    0
+    nullptr
     };
 
   cout << "CTEST_FULL_OUTPUT (Avoid ctest truncation of output)" << endl;

Common/Core/Testing/Cxx/TestUnicodeStringArrayAPI.cxx

@@ -215,7 +215,7 @@ int TestErrorsAndWarnings()
   array->AddObserver(vtkCommand::WarningEvent, errorObserver);
 
   // ERROR: Not implmented
-  array->SetVoidArray(0, 1, 1);
+  array->SetVoidArray(nullptr, 1, 1);
   if (errorObserver->GetError())
   {
     std::cout << "Caught expected error: "

Common/Core/Testing/Cxx/TestWeakPointer.cxx

@@ -61,12 +61,12 @@ int TestWeakPointer(int,char *[])
   testbits = (testbits << 1) | ((da2 <= ia) ? 1 : 0);
   testbits = (testbits << 1) | ((da2 > ia) ? 1 : 0);
   testbits = (testbits << 1) | ((da2 >= ia) ? 1 : 0);
-  testbits = (testbits << 1) | ((da1 == 0) ? 1 : 0);
-  testbits = (testbits << 1) | ((da1 != 0) ? 1 : 0);
-  testbits = (testbits << 1) | ((da1 < 0) ? 1 : 0);
-  testbits = (testbits << 1) | ((da1 <= 0) ? 1 : 0);
-  testbits = (testbits << 1) | ((da1 > 0) ? 1 : 0);
-  testbits = (testbits << 1) | ((da1 >= 0) ? 1 : 0);
+  testbits = (testbits << 1) | ((da1 == nullptr) ? 1 : 0);
+  testbits = (testbits << 1) | ((da1 != nullptr) ? 1 : 0);
+  testbits = (testbits << 1) | ((da1 < nullptr) ? 1 : 0);
+  testbits = (testbits << 1) | ((da1 <= nullptr) ? 1 : 0);
+  testbits = (testbits << 1) | ((da1 > nullptr) ? 1 : 0);
+  testbits = (testbits << 1) | ((da1 >= nullptr) ? 1 : 0);
   if (testbits != correctbits)
   {
     unsigned int diffbits = (testbits ^ correctbits);
@@ -97,23 +97,23 @@ int TestWeakPointer(int,char *[])
   }
   cout << "IntArray: " << da2 << "\n";
 
-  if (da1.GetPointer() == 0)
+  if (da1.GetPointer() == nullptr)
   {
     cerr << "da1.GetPointer() is nullptr\n";
     rval = 1;
   }
-  if (da2.GetPointer() == 0)
+  if (da2.GetPointer() == nullptr)
   {
     cerr << "da2.GetPointer() is nullptr\n";
     rval = 1;
   }
-  if (da3.Get() != 0)
+  if (da3.Get() != nullptr)
   {
     cerr << "da3.GetPointer() is not nullptr\n";
     rval = 1;
   }
 
-  da2 = 0;
+  da2 = nullptr;
   ia->Delete();
 
   if (da1.GetPointer() != nullptr)

Common/DataModel/Testing/Cxx/TestImageDataFindCell.cxx

@@ -57,7 +57,7 @@ inline int DoTest(
       x[i] = bounds[2*i+j];
 
       cellId = image->FindCell(
-        x, 0, 0, 0.0, subId, pcoords, weights);
+        x, nullptr, 0, 0.0, subId, pcoords, weights);
 
       if (cellId < 0)
       {
@@ -73,7 +73,7 @@ inline int DoTest(
       x[i] = bounds[2*i+j] + offset;
 
       cellId = image->FindCell(
-        x, 0, 0, 0.0, subId, pcoords, weights);
+        x, nullptr, 0, 0.0, subId, pcoords, weights);
 
       if (cellId >= 0)
       {
@@ -88,7 +88,7 @@ inline int DoTest(
       x[i] = bounds[2*i+j] + ((j == 0) ? (-tol*0.5) : (tol*0.5));
 
       cellId = image->FindCell(
-        x, 0, 0, tol*tol, subId, pcoords, weights);
+        x, nullptr, 0, tol*tol, subId, pcoords, weights);
 
       if (cellId < 0)
       {

Common/DataModel/Testing/Cxx/TestImageIterator.cxx

@@ -32,7 +32,7 @@ inline int DoTest(T*)
   id->AllocateScalars(VTK_DOUBLE, 1);
   vtkImageIterator<T> *it = new vtkImageIterator<T>(id,ext);
   vtkImageProgressIterator<T> *ipt
-    = new vtkImageProgressIterator<T>(id,ext,0,0);
+    = new vtkImageProgressIterator<T>(id,ext,nullptr,0);
   delete it;
   delete ipt;
   id->Delete();
@@ -42,16 +42,16 @@ inline int DoTest(T*)
 
 int TestImageIterator(int,char *[])
 {
-  DoTest( static_cast<char*>( 0 ) );
-  DoTest( static_cast<int*>( 0 ) );
-  DoTest( static_cast<long*>( 0 ) );
-  DoTest( static_cast<short*>( 0 ) );
-  DoTest( static_cast<float*>( 0 ) );
-  DoTest( static_cast<double*>( 0 ) );
-  DoTest( static_cast<unsigned long*>( 0 ) );
-  DoTest( static_cast<unsigned short*>( 0 ) );
-  DoTest( static_cast<unsigned char*>( 0 ) );
-  DoTest( static_cast<unsigned int*>( 0 ) );
+  DoTest( static_cast<char*>( nullptr ) );
+  DoTest( static_cast<int*>( nullptr ) );
+  DoTest( static_cast<long*>( nullptr ) );
+  DoTest( static_cast<short*>( nullptr ) );
+  DoTest( static_cast<float*>( nullptr ) );
+  DoTest( static_cast<double*>( nullptr ) );
+  DoTest( static_cast<unsigned long*>( nullptr ) );
+  DoTest( static_cast<unsigned short*>( nullptr ) );
+  DoTest( static_cast<unsigned char*>( nullptr ) );
+  DoTest( static_cast<unsigned int*>( nullptr ) );
 
   return 0;
 }

Common/DataModel/Testing/Cxx/TestQuadraticPolygon.cxx

@@ -147,7 +147,7 @@ int vtkQuadraticPolygonTest::TestGetSet()
     return EXIT_FAILURE;
   }
 
-  if (this->GetFace(0) != 0)
+  if (this->GetFace(0) != nullptr)
   {
     cerr << "ERROR:  quadratic polygon face is " << this->GetFace(0)
          << ", should be 0" << endl;

Common/DataModel/Testing/Cxx/TestSmoothErrorMetric.cxx

@@ -119,7 +119,7 @@ int TestSmoothErrorMetric(int argc, char* argv[])
 
   geom->Update(); //So that we can call GetRange() on the scalars
 
-  assert(geom->GetOutput()!=0);
+  assert(geom->GetOutput()!=nullptr);
 
   // This creates a blue to red lut.
   vtkSmartPointer<vtkLookupTable> lut =
@@ -149,9 +149,9 @@ int TestSmoothErrorMetric(int argc, char* argv[])
   mapper->SetInputConnection( geom->GetOutputPort() );
 #endif
 
-  if(geom->GetOutput()->GetPointData()!=0)
+  if(geom->GetOutput()->GetPointData()!=nullptr)
   {
-    if(geom->GetOutput()->GetPointData()->GetScalars()!=0)
+    if(geom->GetOutput()->GetPointData()->GetScalars()!=nullptr)
     {
       mapper->SetScalarRange( geom->GetOutput()->GetPointData()->
                               GetScalars()->GetRange());

Common/DataModel/Testing/Cxx/otherImageData.cxx

@@ -597,7 +597,7 @@ int TestOID(ostream& strm)
 
   point3D[0] = 10.5; point3D[1] = 12.1; point3D[2] = 0;
   pcoords[0] = pcoords[1] = pcoords[2] = 0.0;
-  dummyCell = 0;
+  dummyCell = nullptr;
   vtkCell *found = id2Dxy->FindAndGetCell(point3D, dummyCell, 0, 0, subId, pcoords, weights);
   if (found == nullptr)
   {
@@ -614,7 +614,7 @@ int TestOID(ostream& strm)
   point3D[0] = 10.5; point3D[1] = 0.0; point3D[2] = 14.7;
   pcoords[0] = pcoords[1] = pcoords[2] = 0.0;
   weights[0] = weights[1] = weights[2] = weights[3] = 0.0;
-  dummyCell = 0;
+  dummyCell = nullptr;
   found = id2Dxz->FindAndGetCell(point3D, dummyCell, 0, 0, subId, pcoords, weights);
   if (found == nullptr)
   {
@@ -631,7 +631,7 @@ int TestOID(ostream& strm)
   point3D[0] = 0.0; point3D[1] = 12.1; point3D[2] = 14.7;
   pcoords[0] = pcoords[1] = pcoords[2] = 0.0;
   weights[0] = weights[1] = weights[2] = weights[3] = 0.0;
-  dummyCell = 0;
+  dummyCell = nullptr;
   found = id2Dyz->FindAndGetCell(point3D, dummyCell, 0, 0, subId, pcoords, weights);
   if (found == nullptr)
   {
@@ -646,7 +646,7 @@ int TestOID(ostream& strm)
        << weights[0] << ", " << weights[1] << ", " << weights[2] << ", " << weights[3] << endl;
 
   point3D[0] = 10.5; point3D[1] = 0.0; point3D[2] = 0.0;
-  dummyCell = 0;
+  dummyCell = nullptr;
   found = id1Dx->FindAndGetCell(point3D, dummyCell, 0, 0, subId, pcoords, weights);
   if (found == nullptr)
   {
@@ -662,7 +662,7 @@ int TestOID(ostream& strm)
 
 
   point3D[0] = 0.0; point3D[1] = 12.1; point3D[2] = 0.0;
-  dummyCell = 0;
+  dummyCell = nullptr;
   found = id1Dy->FindAndGetCell(point3D, dummyCell, 0, 0, subId, pcoords, weights);
   if (found == nullptr)
   {
@@ -678,7 +678,7 @@ int TestOID(ostream& strm)
 
 
   point3D[0] = 0.0; point3D[1] = 0.0; point3D[2] = 14.7;
-  dummyCell = 0;
+  dummyCell = nullptr;
   found = id1Dz->FindAndGetCell(point3D, dummyCell, 0, 0, subId, pcoords, weights);
   if (found == nullptr)
   {

Common/DataModel/Testing/Cxx/otherRectilinearGrid.cxx

@@ -686,7 +686,7 @@ int TestORG(ostream& strm)
 
   point3D[0] = 10.5; point3D[1] = 12.1; point3D[2] = 0;
   pcoords[0] = pcoords[1] = pcoords[2] = 0.0;
-  dummyCell = 0;
+  dummyCell = nullptr;
   vtkCell *found = rg2Dxy->FindAndGetCell(point3D, dummyCell, 0, 0, subId, pcoords, weights);
   if (found == nullptr)
   {
@@ -703,7 +703,7 @@ int TestORG(ostream& strm)
   point3D[0] = 10.5; point3D[1] = 0.0; point3D[2] = 14.7;
   pcoords[0] = pcoords[1] = pcoords[2] = 0.0;
   weights[0] = weights[1] = weights[2] = weights[3] = 0.0;
-  dummyCell = 0;
+  dummyCell = nullptr;
   found = rg2Dxz->FindAndGetCell(point3D, dummyCell, 0, 0, subId, pcoords, weights);
   if (found == nullptr)
   {
@@ -720,7 +720,7 @@ int TestORG(ostream& strm)
   point3D[0] = 0.0; point3D[1] = 12.1; point3D[2] = 14.7;
   pcoords[0] = pcoords[1] = pcoords[2] = 0.0;
   weights[0] = weights[1] = weights[2] = weights[3] = 0.0;
-  dummyCell = 0;
+  dummyCell = nullptr;
   found = rg2Dyz->FindAndGetCell(point3D, dummyCell, 0, 0, subId, pcoords, weights);
   if (found == nullptr)
   {
@@ -735,7 +735,7 @@ int TestORG(ostream& strm)
        << weights[0] << ", " << weights[1] << ", " << weights[2] << ", " << weights[3] << endl;
 
   point3D[0] = 10.5; point3D[1] = 0.0; point3D[2] = 0.0;
-  dummyCell = 0;
+  dummyCell = nullptr;
   found = rg1Dx->FindAndGetCell(point3D, dummyCell, 0, 0, subId, pcoords, weights);
   if (found == nullptr)
   {
@@ -751,7 +751,7 @@ int TestORG(ostream& strm)
 
 
   point3D[0] = 0.0; point3D[1] = 12.1; point3D[2] = 0.0;
-  dummyCell = 0;
+  dummyCell = nullptr;
   found = rg1Dy->FindAndGetCell(point3D, dummyCell, 0, 0, subId, pcoords, weights);
   if (found == nullptr)
   {
@@ -767,7 +767,7 @@ int TestORG(ostream& strm)
 
 
   point3D[0] = 0.0; point3D[1] = 0.0; point3D[2] = 14.7;
-  dummyCell = 0;
+  dummyCell = nullptr;
   found = rg1Dz->FindAndGetCell(point3D, dummyCell, 0, 0, subId, pcoords, weights);
   if (found == nullptr)
   {

Common/DataModel/Testing/Cxx/otherStructuredGrid.cxx

@@ -706,7 +706,7 @@ int TestOSG(ostream& strm)
 
   double pcoords[3], weights[8];
   int subId;
-  vtkCell *dummyCell = 0;
+  vtkCell *dummyCell = nullptr;
 
   point3D[0] = 10.5;
   point3D[1] = 12.1;
@@ -723,7 +723,7 @@ int TestOSG(ostream& strm)
 
   point3D[0] = 10.5; point3D[1] = 12.1; point3D[2] = 0;
   pcoords[0] = pcoords[1] = pcoords[2] = 0.0;
-  dummyCell = 0;
+  dummyCell = nullptr;
   vtkCell *found = sg2Dxy->FindAndGetCell(point3D, dummyCell, 0, 0, subId, pcoords, weights);
   if (found == nullptr)
   {
@@ -740,7 +740,7 @@ int TestOSG(ostream& strm)
   point3D[0] = 10.5; point3D[1] = 0.0; point3D[2] = 14.7;
   pcoords[0] = pcoords[1] = pcoords[2] = 0.0;
   weights[0] = weights[1] = weights[2] = weights[3] = 0.0;
-  dummyCell = 0;
+  dummyCell = nullptr;
   found = sg2Dxz->FindAndGetCell(point3D, dummyCell, 0, 0, subId, pcoords, weights);
   if (found == nullptr)
   {
@@ -757,7 +757,7 @@ int TestOSG(ostream& strm)
   point3D[0] = 0.0; point3D[1] = 12.1; point3D[2] = 14.7;
   pcoords[0] = pcoords[1] = pcoords[2] = 0.0;
   weights[0] = weights[1] = weights[2] = weights[3] = 0.0;
-  dummyCell = 0;
+  dummyCell = nullptr;
   found = sg2Dyz->FindAndGetCell(point3D, dummyCell, 0, 0, subId, pcoords, weights);
   if (found == nullptr)
   {
@@ -772,7 +772,7 @@ int TestOSG(ostream& strm)
        << weights[0] << ", " << weights[1] << ", " << weights[2] << ", " << weights[3] << endl;
 
   point3D[0] = 10.5; point3D[1] = 0.0; point3D[2] = 0.0;
-  dummyCell = 0;
+  dummyCell = nullptr;
   found = sg1Dx->FindAndGetCell(point3D, dummyCell, 0, 0, subId, pcoords, weights);
   if (found == nullptr)
   {
@@ -788,7 +788,7 @@ int TestOSG(ostream& strm)
 
 
   point3D[0] = 0.0; point3D[1] = 12.1; point3D[2] = 0.0;
-  dummyCell = 0;
+  dummyCell = nullptr;
   found = sg1Dy->FindAndGetCell(point3D, dummyCell, 0, 0, subId, pcoords, weights);
   if (found == nullptr)
   {
@@ -804,7 +804,7 @@ int TestOSG(ostream& strm)
 
 
   point3D[0] = 0.0; point3D[1] = 0.0; point3D[2] = 14.7;
-  dummyCell = 0;
+  dummyCell = nullptr;
   found = sg1Dz->FindAndGetCell(point3D, dummyCell, 0, 0, subId, pcoords, weights);
   if (found == nullptr)
   {

Common/DataModel/Testing/Cxx/otherUniformGrid.cxx

@@ -597,7 +597,7 @@ int TestOUG(ostream& strm)
 
   point3D[0] = 10.5; point3D[1] = 12.1; point3D[2] = 0;
   pcoords[0] = pcoords[1] = pcoords[2] = 0.0;
-  dummyCell = 0;
+  dummyCell = nullptr;
   vtkCell *found = ug2Dxy->FindAndGetCell(point3D, dummyCell, 0, 0, subId, pcoords, weights);
   if (found == nullptr)
   {
@@ -614,7 +614,7 @@ int TestOUG(ostream& strm)
   point3D[0] = 10.5; point3D[1] = 0.0; point3D[2] = 14.7;
   pcoords[0] = pcoords[1] = pcoords[2] = 0.0;
   weights[0] = weights[1] = weights[2] = weights[3] = 0.0;
-  dummyCell = 0;
+  dummyCell = nullptr;
   found = ug2Dxz->FindAndGetCell(point3D, dummyCell, 0, 0, subId, pcoords, weights);
   if (found == nullptr)
   {
@@ -631,7 +631,7 @@ int TestOUG(ostream& strm)
   point3D[0] = 0.0; point3D[1] = 12.1; point3D[2] = 14.7;
   pcoords[0] = pcoords[1] = pcoords[2] = 0.0;
   weights[0] = weights[1] = weights[2] = weights[3] = 0.0;
-  dummyCell = 0;
+  dummyCell = nullptr;
   found = ug2Dyz->FindAndGetCell(point3D, dummyCell, 0, 0, subId, pcoords, weights);
   if (found == nullptr)
   {
@@ -646,7 +646,7 @@ int TestOUG(ostream& strm)
        << weights[0] << ", " << weights[1] << ", " << weights[2] << ", " << weights[3] << endl;
 
   point3D[0] = 10.5; point3D[1] = 0.0; point3D[2] = 0.0;
-  dummyCell = 0;
+  dummyCell = nullptr;
   found = ug1Dx->FindAndGetCell(point3D, dummyCell, 0, 0, subId, pcoords, weights);
   if (found == nullptr)
   {
@@ -662,7 +662,7 @@ int TestOUG(ostream& strm)
 
 
   point3D[0] = 0.0; point3D[1] = 12.1; point3D[2] = 0.0;
-  dummyCell = 0;
+  dummyCell = nullptr;