why $ is need to access array [negative index]?
nise at nise.com
Fri Sep 18 20:08:36 UTC 2020
On Friday, 18 September 2020 at 19:53:41 UTC, mw wrote:
> In Python it's such a convenience to be able to access array
> element from the end:
> in D, we can do that too, but need an extra $: arr[$-1]
> I'm porting some code from Python to D:
> int signs; // sign: -1, 0, 1
> int sign = -1; // for example
> writeln(signs[sign]); // Range violation
> // Error: array index 18446744073709551615 is out of bounds
> signs[0 .. 3]
> (yes, I know I can use AA, int[int], but it just make things
> Can we have a DIP remove / make optional `$` in this usage?
Array indexes in D are using unsigned integers so negative
numbers don't exist. What you are suggesting isn't possible in D.
$ is the length of the array so $-1 is correct in this regard and
produces a correct positive number given that it is inside the
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