iterating over a group in multimap how do I know if I am in first or last elements?

Question

I mean this situation:

for (auto iter = myMmap.equal_range(find_key).first;
  iter != myMmap.equal_range(find_key).second;
  ++iter)
{
  //code
}

How to derive from the iterator (that is without using counters) that I'm in first or last item in this set.

Answer 1

Like this?

auto range = myMmap.equal_range(find_key);

for (auto it = range.first; it != range.second; ++it) {
    if (it == range.first) { // first

    } else if (std::next(it) == range.second) { // last

    } else {}
}