How can I make an unordered set of pairs of integers in C++?

Question

The following program does not compile an unordered set of pairs of integers, but it does for integers. Can unordered_set and its member functions be used on us

Answer 1

OK here is a simple solution with guaranteed non collisions. Simply reduce your problem to an existing solution i.e. convert your pair of int to string like so:

 auto stringify = [](const pair& p, string sep = "-")-> string{
    return to_string(p.first) + sep + to_string(p.second);
 }

 unordered_set myset;
 myset.insert(stringify(make_pair(1, 2)));
 myset.insert(stringify(make_pair(3, 4)));
 myset.insert(stringify(make_pair(5, 6)));

Enjoy!