BUG: Match return types for nullptr return values
BUG: Match return types for nullptr return values

ITK/Modules/Core/QuadEdgeMesh/include/itkQuadEdgeMesh.h:221:14: error: ambiguous conversion for C-style cast from 'int' to 'itk::QuadEdgeMesh<double, 3,
      itk::QuadEdgeMeshExtendedTraits<double, 3, 2, double, double, double, bool, bool> >::BoundaryAssignmentsContainerPointer' (aka 'SmartPointer<itk::MapContainer<itk::Mesh<double, 3,
      itk::QuadEdgeMeshExtendedTraits<double, 3, 2, double, double, double, bool, bool> >::BoundaryAssignmentIdentifier, unsigned long> >')
    return ( (BoundaryAssignmentsContainerPointer)0 );
             ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
ITK/Modules/Core/QuadEdgeMesh/src/itkQuadEdgeMeshExplicit.cxx:3:44: note: in instantiation of member function 'itk::QuadEdgeMesh<double, 3,
      itk::QuadEdgeMeshExtendedTraits<double, 3, 2, double, double, double, bool, bool> >::GetBoundaryAssignments' requested here
template class ITKQuadEdgeMesh_EXPORT itk::QuadEdgeMesh<double, 3u, itk::QuadEdgeMeshExtendedTraits<double, 3u, 2u, double, double, double, bool, bool> >; //Instantiated 12 times
                                           ^
ITK/Modules/Core/Common/include/itkSmartPointer.h:69:13: note: candidate constructor
  constexpr SmartPointer (std::nullptr_t p) noexcept:
            ^

BRAINSia/ITK,vfonov/ITK,LucasGandel/ITK,BRAINSia/ITK,InsightSoftwareConsortium/ITK,LucasGandel/ITK,Kitware/ITK,malaterre/ITK,richardbeare/ITK,vfonov/ITK,hjmjohnson/ITK,malaterre/ITK,thewtex/ITK,malaterre/ITK,Kitware/ITK,Kitware/ITK,LucasGandel/ITK,InsightSoftwareConsortium/ITK,InsightSoftwareConsortium/ITK,BRAINSia/ITK,Kitware/ITK,Kitware/ITK,InsightSoftwareConsortium/ITK,InsightSoftwareConsortium/ITK,thewtex/ITK,malaterre/ITK,richardbeare/ITK,Kitware/ITK,thewtex/ITK,hjmjohnson/ITK,richardbeare/ITK,LucasGandel/ITK,InsightSoftwareConsortium/ITK,Kitware/ITK,thewtex/ITK,malaterre/ITK,LucasGandel/ITK,malaterre/ITK,thewtex/ITK,richardbeare/ITK,hjmjohnson/ITK,malaterre/ITK,malaterre/ITK,vfonov/ITK,richardbeare/ITK,BRAINSia/ITK,LucasGandel/ITK,richardbeare/ITK,hjmjohnson/ITK,LucasGandel/ITK,vfonov/ITK,richardbeare/ITK,vfonov/ITK,thewtex/ITK,hjmjohnson/ITK,BRAINSia/ITK,BRAINSia/ITK,hjmjohnson/ITK,LucasGandel/ITK,malaterre/ITK,thewtex/ITK,BRAINSia/ITK,InsightSoftwareConsortium/ITK,hjmjohnson/ITK,vfonov/ITK,vfonov/ITK,vfonov/ITK,vfonov/ITK