[Insight-developers] NumericTraits for FixedArray does not define Zero

[Bradley Lowekamp]

Hello Dan,

Are you using the latest CVS? ( ahh I see you are using 3.16... )

I believe that this may be been addressed in the past couple of months with a macro for many of the array like types.

http://public.kitware.com/cgi-bin/viewcvs.cgi/Code/Common/itkNumericTraitsFixedArrayPixel.h?revision=1.8&root=Insight&view=markup

Brad

On Feb 21, 2010, at 3:52 AM, Dan Mueller wrote:

> Hi Insight Developers,
> 
> I notice NumericTraits for FixedArray does not define Zero. eg.
>    typedef itk::FixedArray<unsigned char, 3> PixelType;
>    PixelType zero = itk::NumericTraits<PixelType>::Zero;
> returns
>    error C2039: 'Zero' : is not a member of
> 'itk::NumericTraits<itk::FixedArray<TValueType,VLength>>'
> (VIsual Studio 8.0, ITK 3.16, Windows Vista 32-bit).
> 
> Is there a good reason for this?
> 
> Couldn't it be defined similar to VariableLengthVector? ie.
> (though without needing to pass in self for the size)
> 
>  static const Self Zero( const Self  & a ) \
>  {  \
>    Self b(a.Size());  \
>    b.Fill( NumericTraits< T >::Zero ); \
>    return b; \
>  } \
> 
> Thanks for any advice.
> 
> Regards, Dan
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