[Discuss-gnuradio] Dealing with `divide 0` or `Inf` in GNU Radio C++ code.

[Jeon]

Let's think about the following auto/cross correlator: http://i.imgur.com/Fy5hdVj.png

I've placed `divide` because I need to normalize the correlation result.

If we place `null source`, or `constant source with value of zero` right before the `pad source`, the simplified form of the correlator becomes 0 divided by 0.

I've placed `time sink` right after the `pad sink` then, I can see the line hit the infinity. With a simplified flow graph: http://i.imgur.com/Msx9EQj.png

Back to the my correlator, how can I handle such `infinity` value coming into the next block?

My guess is that if a source block is a type of float, then `infinity` might have a maximum value of float. So, I think I can reject `infinity` value with `if (in[i] > threshold)`, where `threshold` is big enough, for correlator it is fine to have a value just larger than one.

Do you think what I guess is right? Or can some boost numeric types, or PMT help somehow to deal with it?

In addition, not important.
In pages http://en.cppreference.com/w/cpp/types/numeric_limits/infinity and http://en.cppreference.com/w/cpp/numeric/math/INFINITY,

non floating point numeric types can't handle infinity.

Is it also applied to GNU Radio?

Regards,

Jeon.