[OT] The Usual Arithmetic Confusions
gassa at mail.ru
Sun Jan 30 17:22:18 UTC 2022
On Friday, 28 January 2022 at 18:39:54 UTC, deadalnix wrote:
> On Friday, 28 January 2022 at 02:15:51 UTC, Paul Backus wrote:
> For what it is worth, the first exemple is fixed in D.
> The multiplication one is particularly interesting. The other
> ones really banal wrap around behavior, which your really can't
> do without if youw ant to make anything fast, IMO.
> I'm surprised there aren't more exemple of signed -> unsigned
> conversion because that one is a real mind fuck.
I wholeheartedly agree with the latter notion. The dreaded
signed-to-unsigned conversion has definitely bitten me more than
once in D. And not only conversion. Writing something innocent
like `auto var = arr.length`, because `auto` types are generally
more geared towards later code changes. Then doing arithmetic
with `var`... one subtraction, and boom! getting the overflow all
of a sudden.
At least in 64-bit programs, I don't really see the benefit of
the sizes being unsigned anymore. Even C++ has `cont.ssize()`
now for signed size.
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