[Insight-developers] WrapITK build error

[Kent Williams]

I'm a masochist and compile WrapITK with everything turned on, and now 
I'm getting this error with gcc 4.1 on Linux:

Building CXX object 
Modules/Compose/CMakeFiles/ComposeTcl.dir/wrap_itkVectorIndexSelectionCastImageFilterTcl.o
.../InsightToolkit/BasicFilters/itkVectorIndexSelectionCastImageFilter.h: 
In member function ‘void 
itk::VectorIndexSelectionCastImageFilter<TInputImage, 
TOutputImage>::BeforeThreadedGenerateData() [with TInputImage = 
itk::VectorImage<long unsigned int, 3u>, TOutputImage = itk::Image<long 
unsigned int, 3u>]’:
/scratch/kent/KWW/build/WrapITK/Modules/Compose/wrap_itkVectorIndexSelectionCastImageFilterTcl.cxx:84721: 
instantiated from here
.../InsightToolkit/BasicFilters/itkVectorIndexSelectionCastImageFilter.h:136: 
error: no type named ‘ScalarRealType’ in ‘class 
itk::NumericTraits<itk::VariableLengthVector<long unsigned int> >’
.../InsightToolkit/BasicFilters/itkVectorIndexSelectionCastImageFilter.h:139: 
error: no type named ‘ScalarRealType’ in ‘class 
itk::NumericTraits<itk::VariableLengthVector<long unsigned int> >’
.../InsightToolkit/BasicFilters/itkVectorIndexSelectionCastImageFilter.h: 
In member function ‘void 
itk::VectorIndexSelectionCastImageFilter<TInputImage, 
TOutputImage>::BeforeThreadedGenerateData() [with TInputImage = 
itk::VectorImage<long unsigned int, 2u>, TOutputImage = itk::Image<long 
unsigned int, 2u>]’:
/scratch/kent/KWW/build/WrapITK/Modules/Compose/wrap_itkVectorIndexSelectionCastImageFilterTcl.cxx:84721: 
instantiated from here
.../InsightToolkit/BasicFilters/itkVectorIndexSelectionCastImageFilter.h:136: 
error: no type named ‘ScalarRealType’ in ‘class 
itk::NumericTraits<itk::VariableLengthVector<long unsigned int> >’
.../InsightToolkit/BasicFilters/itkVectorIndexSelectionCastImageFilter.h:139: 
error: no type named ‘ScalarRealType’ in ‘class 
itk::NumericTraits<itk::VariableLengthVector<long unsigned int> >’
make[3]: *** 
[Modules/Compose/CMakeFiles/ComposeTcl.dir/wrap_itkVectorIndexSelectionCastImageFilterTcl.o] 
Error 1
make[3]: Target `Modules/Compose/CMakeFiles/ComposeTcl.dir/build' not 
remade because of errors.

What is happening is that in itkNumericTraits.h is that ScalarRealType 
and RealType are only defined for a particular revision of Visual C++. 
It seems like the itk::VectorIndexSelectionCastImageFilter can't handle 
itk::VariableLengthVector<long unsigned int> as the pixel type.