On 13 February 2017 at 16:32, Jonathan Wakely wrote: > On 13 February 2017 at 16:29, Segher Boessenkool > <segher@xxxxxxxxxxxxxxxxxxx> 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. See https://developers.redhat.com/blog/2016/02/29/why-cstdlib-is-more-complicated-than-you-might-think/ for more detail than you are likely to need.
