Hi, boost users and experts. I often use boost::enable_shared_from_this. I know - it contains boost::weak_ptr, which is initiated in the details of boost::shared_ptr's constructor. Also sometimes I need function weak_from_this() at the classes derived from boost::enable_shared_from_this. I currently use something like: ... class my_class : public boost::enable_shared_from_this<my_class> , private boost::noncopyable { ...somewhere in my_class details... private: typedef my_class this_type; typedef boost::weak_ptr<this_type> this_type_weak_ptr; this_type_weak_ptr weak_from_this() { return this_type_weak_ptr(shared_from_this()); } }; // my_class ... But as I know restoring shared_ptr from weak_ptr (done in shared_from_this()) is quite expensive. So my_class::weak_from_this() does unnecessary work instead of just copy internal weak_ptr stored in enable_shared_from_this. So the question is - why there is no weak_from_this() member function in boost::enable_shared_from_this class? May be it would be useful to add such member function? Regards, Marat Abrarov.