I believe you can do what you want like this: #include <boost\shared_ptr.hpp> #include <boost\weak_ptr.hpp> class A; class B; typedef boost::shared_ptr<A> spA; typedef boost::shared_ptr<B> spB; typedef boost::weak_ptr<A> wpB; class A { // ... spB m_b; }; class B { wsB m_wpParent; // ... std::vector<spA> m_a; }; I hope this helps, Manos From: boost-users-bounces@lists.boost.org [mailto:boost-users-bounces@lists.boost.org] On Behalf Of Olivier Tournaire Sent: Thursday, May 10, 2007 9:08 PM To: boost-users@lists.boost.org Subject: [Boost-users] Smart pointers Hi all Suppose I have two classes A and B like those ones : Typedef class A { // ... B *m_b; }; class B { // ... std::vector<A *> m_a; }; m_b is used to know who is the parent of the object. I would like to use smart pointers. How can I do this ? Thanks in advance -- Le temps des cerises reviendra. Dans l'immédiat, c'est le temps des noyaux. Courage.