I remember at the time when C++ ranges were getting standardized there was a talk about an alternative replacement for iterators: splitting them into things tha

I remember at the time when C++ ranges were getting standardized there was a talk about an alternative replacement for iterators: splitting them into things that point at elements and between them. That solved the reversal / backward iteration problem rather neatly, although IIRC there wasn’t always a clear choice of which kind of thing should now be returned in place of a single iterator. (Of course, that doesn’t help at all if you’re using raw indices, but then again, people used to describe screen coordinates as pointing between “little square” pixels rather than at sample locations back in the days of the original Macintosh and 16-bit Windows.)