In C++11 and beyond does std::string::operator[] do bounds checking?

Question

I have seen many times that std::string::operator[] does not do any bounds checking. Even What is the difference between string::at and string::operator[]?, as

Answer 1

This operator of standard containers emulates the behavior of the operator [] of ordinary arrays. So it does not make any checks. However in the debug mode the corresponding library can provide this checking.

If you want to check the index then use member function at() instead.