Date:	18 Mar 2003 15:54:21 -0000
Message-ID:	<20030318155421.8252.qmail@tyr.diku.dk>
From:	Morten Welinder <terra AT diku DOT dk>
To:	rudd AT cyberoptics DOT com
cc:	djgpp-workers AT delorie DOT com
Subject:	isnan
Reply-To:	djgpp-workers AT delorie DOT com

You use the fact that sizeof (float) != sizeof (double).

#define isnan(x) (sizeof (x) == sizeof (float)
                  ? isnanf (x)
		  : isnand (x))

-- possibly extended to handle long double also.  (And note that even
thought "x" occurs three times, it will be evaluated exactly once.)

FYI, Solaris just uses a function is double arg.

Morten

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