std::isinf(-inf) strange results

[Jonathan Wakely]

On 13 February 2017 at 16:29, Segher Boessenkool
<segher@kernel.crashing.org> wrote:
> On Mon, Feb 13, 2017 at 05:08:07PM +0100, Andrew - wrote:
>> Is this the expected behaviour when std::isinf(-inf) yields 0 or -1
>> instead of 1?
>
> It returns a bool, not a number.

Unless the C library defines int isinf(double) in which case it
returns a number.

And in that case we can't do much about it, so std::isinf(double) also
returns int.

But this is already fixed in current releases of GCC and glibc.