Re: goto

[Walter Bright]

Andrei Alexandrescu wrote:

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.

Andrei

double euclideanDistance(Range)(Range a, Range b, double limit)
{
    limit *= limit;
    double result = 0;
    for (; 1; a.next, b.next)
    {
        if (a.empty)
        {
           enforce(b.empty);
           break;
        }
        enforce(!b.empty);
        auto t = a.head - b.head;
        result += t * t;
        if (result >= limit) break;
    }
    return sqrt(result);
}