On Mar 16, 2009, at 1:48 PM, Husam Senussi wrote:
I'm trying to find out API or method to check for NaN value in
JavaScriptCore.
If you are writing code to add to JavaScriptCore and need a function
to tell you if a value is NaN, you can call the standard C library
isnan function from <math.h>. To work around problems with
environments that don’t have this function, the file using isnan can
include the <wtf/MathExtras.h> instead of <math.h>. The WTF
MathExtras.h has the responsibility of ensuring it’s defined even if
the system <math.h> doesn’t have it.
It’s even better to write code that doesn’t have to specifically check
for NaN when possible. There are all sorts of ways to do this based on
the behavior of NaN defined by the IEEE standard. For example, if you
have code that should run only if the number is > 0 and not NaN, you
can write:
if (x > 0)
And be guaranteed that it will be false if the number is a NaN. This
is usually more efficient than an explicit isnan function call.
-- Darin
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