void f(void) { cout << "this is working " << boost::enable_shared_from_this<B>::shared_from_this() << endl; } };
You create an empty enable_shared_from_this<B>, then call shared_from_this() on that one which is of course empty. Intended usage is class B : public A, public boost::enable_shared_from_this<B> { public: B() {} virtual ~B() {} void f(void) { cout << "this is working " << shared_from_this() << endl; // ^^^^^^^^^^^^^^^^^^^^^^ } }; This is not the only error though, Since you're deriving from enable_shared_from_this two times, the above will give an ambiguous call error (did you mean enable_shared_from_this<A> or enable_shared_from_this<B>). Since you're not calling shared_from_this() in A, I suggest you remove enable_shared_from_this<A> altogether. / christian
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