Question

 enum aaa {a, b, c};

 std::map <aaa, int> container;

 container[0]; //compilation error

I know that in this case container is empty and I would get segfault, but that’s not the problem. Enum is arithmetic type so why there is a problem?

Answer 1

You’re wrong on both counts. 🙂

An int is not implicitly convertible to an enum, an explicit cast is required, and you wouldn’t get a segfault, because container[0] would value-initialize a new value in the map.