Default Implementations And Additional Conditional Conformances

[dennisvennink]

@nnnnnnnn

One thing to try would be to move your distance(from:to:) implementation into an unconstrained extension. It looks like everything in there should work properly for just a basic Collection , and then you'd get the dispatch you're hoping for.

That should work, yes.

This post from last week by @anthonylatsis contains an example that is very similar (doo is analogous to count and foo is analogous to distance(from:to:)).

@nnnnnnnn

I think the one change you'll need to make is to add this at the beginning, so that non-bidirectional collections don't crash:

if end < start {
    return -distance(from: end, to: start)
}

I'll look into it. I think everything should get handled (tests are here, here, here and here).

Thank you.