How to detect where NaN is passing to CoreGraphics API on Mac OS X 10.9

Question

I have very large graphic Mac app and now I receive a lot of the following messages in Console on 10.9 GM.

: Error: this application, or a library i         


        

Answer 1

so you should get an exception at that point, so an exception breakpoint should work...

here are things to look out for...

you may have messed up a method signature... ie

-(float)myHeight
{
    return 56.0;
}

gets messed up in a subclass

-(int)myHeight
{
    return 42;
}

or you have some bad math(s) that emit a NaN...

there are a couple of ways to detect a NaN... c99 introduced isnan()
also the ieee float trick of (f != f) will be true for NaN