What is a static constructor?

Question

This question was asked to me in an interview:

What is a static constructor?

Does it exist in C++? If yes, please explain it wit

Answer 1

Here is the simplest static constructor in c++17:

#include 
class h {
    public:
    static inline int i;
    private:
    struct constructor {
        constructor() {
         i=3;
        }
    };
    static inline constructor cons;
};

int main() {
  std::cout << h::i;
}