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+compi?er 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
