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

Panagiotis Issaris takis.issaris
Sat Sep 23 22:12:08 CEST 2006


On za, 2006-09-23 at 12:16 -0400, Rich Felker wrote:
> > > 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.
Well, still more useful than having NAN defined as 0 :)

> Also you can define a non-exception-raising NAN using unions; this
> might be preferable but it requires C99 and IEEE float.
I thought C99 defines NAN?

With friendly regards,

More information about the ffmpeg-devel mailing list