Refactoring methods that return references to temporary objects

In the class ForInterview the functions get_ref() currently return a reference to a locally created instance, which leads to a dangling reference. Refactor the implementation so that the returned reference remains valid after the function exits.

class ForInterview {
public:
    struct S {
        int x = 1;
    };

    const S& get_ref() const {
        S s;
        return s;
    }

    S& get_ref() {
        S s;
        return s;
    }

    void run() {
        const S& cs = get_ref();
        S& s = get_ref();
        std::cout << cs.x;
        std::cout << s.x;
    }
};