[Insight-users] Accessing a POD pixel value as if it were the 0th component of a vector pixel type

[David Doria]

I often have the case where I want a function template to operate on all
channels of an image. I'd like to be able to pass both a scalar image and a
vector image to the function.

template <typename TImage>
void OperateOnEveryChannel(const TImage* const image)
{
  itk::Index<2> index = {{0,0}};
  typename TImage::PixelType pixel = image->GetPixel(index);

  for(unsigned int i = 0; i < image->GetNumberOfComponentsPerPixel(); ++i)
    {
    std::cout << pixel[i] << std::endl;
    }
}

If TImage is an itk::VectorImage, all is well. However, if TImage is an
itk::Image<POD>, the scalar pixel types do not have an operator[], so
although pixel[0] makes logical sense from the algorithm's perspective, it
is not valid syntax.

Is there any way to do this without writing a specialization?

Thanks,

David
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