Can we get rid of opApply?

[Denis Koroskin]

One nice thing that opApply capable of is it can avoid heap activity by stack-allocating data during iteration.

For example, given an array of ints, iterate over string representations of them:

struct IntegersAsString
{
    void opAplly(int delegate(string s) dg)
    {
        char[16] temp;

        foreach (i; array) {
            int len = sprintf(temp, "%d", i);
            int result = dg(temp[0..len]);
            if (result != 0) {
                return result;
            }
        }

        return 0;
    }

    private int[] array;
}

int array = [1, 1, 2, 3, 5, 8, 13];

// no heap allocation take place
foreach (string s; IntegersAsString(array)) {
    writeln(s);
}

How would you do that with ranges?