Is it a good idea to use IEEE754 floating point NaN for values which are not set?

Question

Is it a good idea to use IEEE754 floating point NaN (not-a-number) for values which are undefined for non-mathematical reasons?

In our case they are not yet set beca

Answer 1

This sounds like a good use for nans to me. Wish I had thought of it...

Sure, they are supposed to propagate like a virus, that is the point.

I think I would use nan instead of one of the infinities. It might be nice to use a signaling nan and have it cause an event on the first use, but by then its too late it should go quiet on the first use.