Yo dawg…

*xibit-meme.jpg*

This is dangerous

Well, they say you do have to be over 18 to use Concepts

C++: Nuh, uh …

template <typename T>
concept Crackable = requires(T obj) {
    { obj.crack() };
};

auto crack(Crackable auto& nut) {
    nut.crack();
}