I need to create a class hierarchy where every level inherits from boost::enable_shared_from_this. I am having problems caused, I believe, by having more than one copy of enable_shared_from_this. I am using boost 1.34.1 with VS2003 and VS2005, with and without ICL9.1, always getting the same result: a boost::bad_weak_ptr exception. #include <boost/shared_ptr.hpp> #include <boost/enable_shared_from_this.hpp> using namespace boost; struct A : enable_shared_from_this<A> { shared_ptr<A> getA() {return enable_shared_from_this<A>::shared_from_this();} }; struct B : A, enable_shared_from_this<B> { shared_ptr<B> getB() {return enable_shared_from_this<B>::shared_from_this();} }; int main() { shared_ptr<A> pA (new A); pA->getA(); // this works OK shared_ptr<B> pB (new B); pB->getB(); // throws boost::bad_weak_ptr() !? return 0; } question 1: Is this expected or am I doing something wrong? question 2: If it is expected: is it possible to have it explained in the documentation? question 3: Is there a way to accomplish this (inheritance with shared_from_this in all levels) using enable_shared_from_this? Thanks in advance