How does one iterate through an unordered set in C++?

Question

You can use the new range-based for loop:

std::unordered_set<T> mySet;
for (const auto& elem: mySet) {
    /* ... process elem ... */
}

Or, you can use the more traditional iterator-based loop:

std::unordered_set<T> mySet;
for (auto itr = mySet.begin(); itr != mySet.end(); ++itr) {
    /* ... process *itr ... */
}

Or, if you don’t have auto support, perhaps because you don’t have C++11 support on your compiler:

std::unordered_set<T> mySet;
for (std::unordered_set<T>::iterator itr = mySet.begin(); itr != mySet.end(); ++itr) {
    /* ... process *itr ... */
}