I was thinking about constructors of classes that derive from
enable_shared_from_this. A problem with these classes is that the
shared_from_this() function is not available from the constructor,
because only afterwards, the object will be owned by a shared_ptr

    class F : public enable_shared_from_this {
    public:
        F() {
           doSomething(shared_from_this());
        }
    }

    int main() { std::make_shared<F>(); }

The code is broken. However, if shared_ptr called a function after it
attached to F, this can be written

    class F : public enable_shared_from_this {
    private:
        virtual void attached() {
           doSomething(shared_from_this());
        }
    }

    int main() { std::make_shared<F>(); }

What are your thoughts on this?

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