[ITK Community] [Insight-developers] itk::VariableLengthVector (and probably other similer classes) allows boundless recursion in operators

[Williams, Norman K]

Logged as a bug; I'd write a patch if I can figure out how to do the C++ template metaprogramming magic.

I ran into this when I needed to multiply an itk::VectorImage by a scalar constant.  Using the MultiplyImageFilter, the SetConstant (and SetConstant1 and SetConstant2) methods only accept InputImage1PixelType as a constant.

So, because I was deep into abstruse code, my naïve solution was to instantiate an itk::VariableLengthVector as the constant to pass to SetConstant, where each element was the scalar constant.

This is, upon further reflection, absurd, because A * B for vectors doesn't even make sense in matrix math, and there's no operator for pairwise multiplication of vector elements.

But what I found out running my program is that itk::VariableLengthVector will instantiate an operator * with boundless recursion.

There are two problems: not disallowing boundless recursion, and not supporting scalar constants for vector Images in itk::BinaryFunctorImageFilter.

https://issues.itk.org/jira/browse/SIMPLEITK-498



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