I didn't dive deep into C++, the main idea is to let users "compose" different permissions instead of the language composing them for us by giving some keywords

I didn't dive deep into C++, the main idea is to let users "compose" different permissions instead of the language composing them for us by giving some keywords. You are correct, the code example is minimal, we can introduce some semantics to how we pass arguments too. I wanted to focus on the idea of composing permissions.