[ksh93-integration-discuss] Re: C99 defines |HUGE_VAL| but no |ishugeval()| ?

[Don Cragun]

Hi Roland,
	I forwarded this question to the Chair of the ISO committee
responsible for the C99 standard.  Part of his response was:

	"isinf() and isnan() are macros not functions in C99 they are
	defined as macros in subclause 7.12.3 Classification macros.

	"The other macros defined by this subclause are:
	   fpclassify()
	   isfinite()
	   isnormal()
	   signbit()

	So, I wouldn't call it an oversight, HUGEVAL has nothing to
	do with the classification of a floating-point values."

	Hope this helps,
	Don

>Date: Fri, 10 Nov 2006 02:02:41 +0100
>From: Roland Mainz <roland.mainz at nrubsig.org>
>
>Hi!
>
>----
>
>[This is slightly offtopic for ksh93 (or better: It may be interesting
>for the C99 math stuff... or not...)]
>
>Question for our standard+compiöer experts:
>C99 defines |HUGE_VAL|, |HUGE_VALF| and |HUGE_VALL| but there seems to
>be no |ishugeval()| function (at least /usr/include/iso/math_c99.h
>doesn't have such a function) to probe for this value while |NaN| and
>|+Inf|/|-Inf| have such probing functions (e.g. |isinf()|, |isnan()|) -
>is that an oversight in the C99 standard or something obmitted
>intentional ? 
>
>----
>
>Bye,
>Roland