I find that isnan and isinf and related functions are defined in cmath
but unfortunately are taken out by a preprocessor macro indicating
something about C99. How can I get isnan defined, and is C99 really
unstable as the comments say?
cmath is a C++ header, and isnan was built into C++ before it was
standardized in C. That guard macro is basically saying "if you're
using a sufficiently-modern C dialect, you don't need to define isnan
as a C++ extension to C."
There are several definitions and implementations of isnan, but if
you're using straight C/C++ you probably want the ones in
/usr/include/math.h.
Chris Espinosa
Apple
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