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Groups > comp.lang.python > #110317
| From | Random832 <random832@fastmail.com> |
|---|---|
| Newsgroups | comp.lang.python |
| Subject | Re: Is signed zero always available? |
| Date | 2016-06-22 10:34 -0400 |
| Message-ID | <mailman.39.1466606092.11516.python-list@python.org> (permalink) |
| References | <576a925f$0$1597$c3e8da3$5496439d@news.astraweb.com> <nke6pk$fjm$1@ger.gmane.org> <1466606088.4117582.645299713.03DA7658@webmail.messagingengine.com> |
On Wed, Jun 22, 2016, at 10:19, Grant Edwards wrote: > Is that guaranteed by Python, or just a side-effect of the > implementation? Back in the days when Python used native C integers I > think the latter. AIUI, native C integers have never reliably supported signed zero even with representations that naively seem to have it. There's no well-defined way to detect it - no int version of copysign, for instance - and implementations are free to erase the distinction on every load/store or define one of them to be a trap representation.
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Is signed zero always available? Steven D'Aprano <steve@pearwood.info> - 2016-06-22 23:27 +1000
Re: Is signed zero always available? Grant Edwards <grant.b.edwards@gmail.com> - 2016-06-22 14:19 +0000
Re: Is signed zero always available? Random832 <random832@fastmail.com> - 2016-06-22 10:34 -0400
Re: Is signed zero always available? Grant Edwards <grant.b.edwards@gmail.com> - 2016-06-22 14:59 +0000
Re: Is signed zero always available? Christopher Reimer <christopher_reimer@icloud.com> - 2016-06-22 15:50 -0700
Re: Is signed zero always available? Steven D'Aprano <steve@pearwood.info> - 2016-06-23 11:16 +1000
Re: Is signed zero always available? Michael Selik <michael.selik@gmail.com> - 2016-06-23 00:34 +0000
Re: Is signed zero always available? Grant Edwards <grant.b.edwards@gmail.com> - 2016-06-23 02:48 +0000
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