alt Hacker NewsClose, it is a std::pair, but it differs in constness. Iterating a std::map<K, V> yields std::pair<const K, V>, so you have:
std::pair<const std::string, int>
std::pair<std::string, int>Close, it is a std::pair, but it differs in constness. Iterating a std::map<K, V> yields std::pair<const K, V>, so you have:
std::pair<const std::string, int>
std::pair<std::string, int>
And what does casting const change, that would involve runtime inefficiencies?