And another correction: given a vector<int> bar, "std::swap(bar[0], bar[1])" does compile fine. All vectors other than vector<bool> return modifiable referenc

And another correction: given a vector<int> bar, "std::swap(bar[0], bar[1])" does compile fine. All vectors other than vector<bool> return modifiable references when elements are accessed with square brackets. I'll stop it now.