C++ how to copy a map to a vector [duplicate]

Answer 1

A map stores a pair -- a key and a value. Which part do you want to copy? Or, do you want to copy both to two distinct vectors?

I want to copy both. Once that's done, I need to figure out how to sort the vector by the second value in the pair.

template 
struct sort_by_val {
  bool operator()(V const& l, V const& r) {
        return // ...
  }
};

vector > outv(map.begin(), map.end());

sort(outv.begin(), outv.end(), sort_by_val());