Re: Not-a-number (nan) issues

[Marty Kraimer <mrk@aps.anl.gov>]

Kay-Uwe Kasemir wrote:

> Greetings!
>
>
> How do you catch NaN? Different from most C/C++ compilers
> and standard C/C++ libraries,
> the one we use for vxWorks/Tornado 2.0.2 does not define "isnan()".
> Shen Peng suggested to use something like this:
> #define isnan(x)    ((x)!=(x))
> Who knows if this works in all cases?


In 3.14 <base>/src/libCom/osi/os/*/epicsMath.h provides an 
implementation of isnan.

The following implementations are provided:

VMS/epicsMath.h    alpha/epicsMath.h  solaris/epicsMath.h
WIN32/epicsMath.h  posix/epicsMath.h  vxWorks/epicsMath.h

A test exists in libCom/test/epicsMathTest

This is documented in the 3.14 Application Developer's Guide.
Look in the index for epicsMath

Marty Kraimer