Can I easily iterate over the values of a map using a range-based for loop?

From C++1z/17, you can use structured bindings:

#include <iostream>
#include <map>
#include <string>

int main() {
   std::map<int, std::string> m;

   m[1] = "first";
   m[2] = "second";
   m[3] = "third";

   for (const auto & [key, value] : m)
      std::cout << value << std::endl;
}