Re: Patch: make behavior of all versions of the "isinf" function be similar

On 1/31/16, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:
> 2. POSIX:2008 only requires that "The isinf() macro shall return a
> non-zero value if and only if its argument has an infinite value."
> Therefore, any assumption about the sign of the result is wrong anyway,
> and any patch that depends on it will be rejected, regardless of what
> isinf.c does. Or else, if you can convince us that such an assumption
> is really valuable, we'd need isinf.c more not less so that we can
> replace isinf() on platforms where it doesn't meet the stronger spec.
>
> regards, tom lane

Ok, then I'll use "is_infinite" from "float.c".
But why functions' (in "src/port/isinf.c") behavior are different? It
is a bit confusing…
--
Best regards,
Vitaly Burovoy