[vtk-developers] Adding IsNan() to vtkMath

[Brad King]

Moreland, Kenneth wrote:
> The source code you sent has as one of its cases a check of the bits of
> an IEEE-754 number.  I see that vtkMath already has a Nan function that
> returns an IEEE NaN.  If VTK is only supporting IEEE-754 in the first
> place, is there any problem with just performing the bit check?

We likely only support IEEE-754, but only by accident.  New code should
be as generic as possible.  Calling the native isnan() is the documented
way to perform this test in C and C++.

-Brad