(C++) Sorting tr1 unordered_map by key

http://stackoverflow.com/questions/6212619/sorting-tr1-unordered-map-by-key

std::unordered_map<int, int> unordered;

std::map<int, int> ordered(unordered.begin(), unordered.end());
for(auto it = ordered.begin(); it != ordered.end(); ++it)
     std::cout << it->second;