Are there practical uses for dynamic-casting to void pointer?

Question

In C++, the T q = dynamic_cast(p); construction performs a runtime cast of a pointer p to some other pointer type T that must

Answer 1

Don't do that at home

struct Base {
    virtual ~Base ();
};

struct D : Base {};

Base *create () {
    D *p = new D;
    return p;
}

void *destroy1 (Base *b) {
    void *p = dynamic_cast (b);
    b->~Base ();
    return p;
}

void destroy2 (void *p) {
    operator delete (p);
}

int i = (destroy2 (destroy1 (create ())), i);

Warning: This will not work if D is defined as:

struct D : Base {
    void* operator new (size_t);
    void operator delete (void*);
};

and there is no way to make it work.