2024/11/05

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2024-11-05 19:45:48 +0100TheCoffeMaker(~TheCoffeM@user/thecoffemaker) TheCoffeMaker
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2024-11-05 18:17:15 +0100spew(~spew@201.141.99.170) spew
2024-11-05 18:14:50 +0100 <tomsmeding> now I'm aware that wikipedia is not a definitive source :)
2024-11-05 18:14:42 +0100 <tomsmeding> wikipedia agrees with me (last paragraph of the introduction) https://en.wikipedia.org/wiki/Integer_overflow
2024-11-05 18:14:36 +0100Pozyomka(~pyon@user/pyon) (Ping timeout: 272 seconds)
2024-11-05 18:13:24 +0100 <tomsmeding> and I'm fairly sure that it's actually _defined_ to wrap, not only implementation-defined
2024-11-05 18:13:08 +0100 <c_wraith> in all cases it *is* defined!
2024-11-05 18:13:03 +0100 <tomsmeding> (certainly not saturating because then the common implementations would be wrong)
2024-11-05 18:12:45 +0100 <tomsmeding> for regular old unsigned types, it's wrapping
2024-11-05 18:12:32 +0100 <c_wraith> I can't remember if C defines the results as wrapping, saturating, or makes it implementation-defined
2024-11-05 18:11:43 +0100 <tomsmeding> so what did you mean with "implementation-defined"?
2024-11-05 18:11:28 +0100 <tomsmeding> okay sure
2024-11-05 18:11:23 +0100 <c_wraith> yeah
2024-11-05 18:11:18 +0100 <tomsmeding> because of wraparound?
2024-11-05 18:11:06 +0100 <c_wraith> just that the results are often going to violate assumptions made elsewhere on the program. that has been a recurring source of bugs in programs. arithmetic that would be right with a signed type being wrong with an unsigned type
2024-11-05 18:10:43 +0100 <tomsmeding> c_wraith: "no" to "subtract" or "no" to "can't" :D
2024-11-05 18:10:03 +0100 <tomsmeding> unsigned integer wraparound is defined in C; does that not extend to size_t?
2024-11-05 18:09:59 +0100 <c_wraith> im pretty sure it's not UB, as it's an unsigned type
2024-11-05 18:09:47 +0100Versality(~Versality@user/Versality) Versality
2024-11-05 18:09:45 +0100 <geekosaur> UB if it would be negative
2024-11-05 18:09:42 +0100 <c_wraith> no.
2024-11-05 18:09:32 +0100 <tomsmeding> ("can't" in the sense of "the implementation might decide to do something weird")
2024-11-05 18:09:10 +0100 <tomsmeding> c_wraith: are you saying that you can't subtract size_t values?
2024-11-05 18:08:11 +0100ash3en1ash3en
2024-11-05 18:08:11 +0100ash3en(~Thunderbi@146.70.124.222) (Ping timeout: 252 seconds)
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2024-11-05 18:07:31 +0100ash3en1(~Thunderbi@2a03:7846:b6eb:101:93ac:a90a:da67:f207) ash3en
2024-11-05 18:04:36 +0100spew(~spew@155.133.15.183) (Quit: spew)