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From: David Presotto <presotto@closedmind.org>
To: 9fans@cse.psu.edu
Subject: Re: [9fans] Inf isInf, NaN, isNaN
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For you, anything.
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From: David Tolpin <dvd@davidashen.net>
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To: 9fans@cse.psu.edu
Subject: Re: [9fans] Inf isInf, NaN, isNaN
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> > ape predates c9x, which (i suspect) added those--i don't remember
> > them from the earlier standard--but that's really just a cue
> > for doug gwyn to contradict me.  i'd check myself, but
> > for some reason, my c book is always where i am not.
> >
>
> For me, the problem was not that isnan was not declared, but that
> isNaN was. 
>

That is, any chance Inf, isInf, NaN, isNaN can be locked out by
_POSIX_SOURCE or will it break something important enough?
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