Getting a shared pointer to a derived class when base class inherits from enable_shared_from_this

Question

I have a class B which inherits from A which in turn derives from enabled_shared_from_this. Now, I want to get a shared pointer to B from an instance of B. shared_from_this will return shared_ptr<A>, not shared_ptr<B>. Should I use boost::static_pointer_cast here? Or is there a better way?

Answer 1

I think in this case more preferable to use boost::dynamic_pointer_cast;

boost::shared_ptr<B> b = boost::dynamic_pointer_cast<B>(shared_from_this());

Answer 2

This seems to be a valid approach as the type is known at compile time.