How can I create an atomic enum in C++?

You can create an atomic enum like this:

#include <atomic>

enum Decision {stay,flee,dance};
std::atomic<Decision> emma_choice {stay}; // emma_choice is atomic

You can also do the same thing with enum classes:

#include <atomic>

enum class Decision {stay,flee,dance};
std::atomic<Decision> emma_choice {Decision::stay}; // emma_choice is atomic