References, Pointers, Ownership

C++

Distinguish owning objects from borrowed references and pointers. Choose interfaces that communicate access and keep borrowed data valid.

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1 Not solved yet. Say it in the signature Practice · Easy
2 Not solved yet. A raw pointer owns nothing Practice · Medium
3 Not solved yet. Give an allocated object an owner Practice · Medium
4 Not solved yet. Break an ownership cycle with weak_ptr Practice · Hard

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In C++20, is deleting this Derived through Base* well-defined?

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struct Base {
    virtual void f() {}
    ~Base() = default;
};

struct Derived : Base {
    ~Derived() = default;
};

int main() {
    Base* b = new Derived;
    delete b;
}

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