[Ffmpeg-devel] [PATCH] Redefine NAN in eval.c

Rich Felker dalias
Sat Sep 23 18:16:50 CEST 2006

On Sat, Sep 23, 2006 at 02:13:14AM +0200, Michael Niedermayer wrote:
> Hi
> On Fri, Sep 22, 2006 at 11:35:36PM +0200, Panagiotis Issaris wrote:
> > Hi,
> > 
> > In the process of modifying the AVOptions code to use eval.c I noticed
> > that I could not report a failed parsing, as ff_eval returned 0 not NAN.
> > The attached patch, defines NAN -if not already defined as f.e. in C99-
> > to be sqrt(-1) in the scope of eval.c. Regression tests succeed.
> iam fine with 0.0/0.0

0.0/0.0 is correct. sqrt(-1) is not a constant and thus it's nonsense.
Also you can define a non-exception-raising NAN using unions; this
might be preferable but it requires C99 and IEEE float.


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