Uml representation of forward declaration + std::vector

This question already has an answer here:

• What is the correct way to represent template classes with UML? 2 answers

What is the uml representation of the following c++ class:

class A;

class B: public std::vector<std::shared_ptr<A>>
{
}

and

class C : public std::enable_shared_from_this<C>
{
}