[boost] Could shared_ptr cause memory leak?

Subject: [boost] Could shared_ptr cause memory leak?
From: hh h (jupiter.hce_at_[hidden])
Date: 2019-01-03 19:25:53

Suppose I have a session object A, the shared_ptr<A> is created and
stored in a global connection list after a connection is accepted by
async_accept, when the connection is terminated, the reference in
connection list is removed, but since A has a member B still holds A
reference, that session object is never deleted, is it memory leak?

class A : public boost::enable_shared_from_this<A> {
public:
     A();
     ~A();
     void Start() {b = make_shared<B>(shared_from_this());}
     void Stop();
private:
    shared_ptr<B> b;
};