how do I make a portable isnan/isinf function

Question

I\'ve been using isinf, isnan functions on Linux platforms which worked perfectly. But this didn\'t work on OS-X, so I decided to use std::is

Answer 1

isnan is part of C++11 now, included in GCC++ I believe, and Apple LLVM.

Now MSVC++ has an _isnan function in .

Appropriate #defines and #includes should make a suitable workaround.

However, I recommend preventing nan from ever occurring, instead of nan detection.