goto

[Lionello Lunesu]

"Andrei Alexandrescu" <SeeWebsiteForEmail at erdani.org> wrote in message 
news:gmgb9u$qkg$1 at digitalmars.com...
>I was coding a simple Euclidean distance function with limit:
>
> double euclideanDistance(Range)(Range a, Range b, double limit)
> {
>     limit *= limit;
>     double result = 0;
>     for (; !a.empty; a.next, b.next)
>     {
>         enforce(!b.empty);
>         auto t = a.head - b.head;
>         result += t * t;
>         if (result >= limit) goto thatsit;
>     }
>     enforce(b.empty);
>   thatsit:
>     return sqrt(result);
> }
>
> How would an elegant goto-less approach look like? It should not duplicate 
> code, e.g. the call to sqrt.

I would refactor the a/b.next and a/b.empty into a new range that does the 
enforcing and then you can use break.

L.