abs and minimum values

Salih Dincer salihdb at hotmail.com
Fri Oct 29 18:19:58 UTC 2021


On Thursday, 28 October 2021 at 21:23:15 UTC, kyle wrote:
> ```
> void main()
> {
>     import std.math : abs, sgn;
>
>     alias n_type = short; //or int, long, byte, whatever
>
>     assert(n_type.min == abs(n_type.min));
>     assert(sgn(abs(n_type.min)) == -1);
> }
> ```
> I stumbled into this fun today. I understand why abs yields a 
> negative value here with overflow and no promotion. I just want 
> to know if it should. Should abs ever return a negative number? 
> Thanks.

this should work on all types:
```d
auto sign(T)(T n) {
   return abs(n) / n;
}
```


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