What's wrong with this code? When I push_back ptr to the vector, it pushes 0 instead of
the value contained in ptr (which I checked and is non-zero).

std::vector<boost::shared_ptr<BaseClass> > baseobjects = get_base_objects(path);

    std::vector<boost::shared_ptr<DerivedClass> > result(get_base_objects.size());
    BOOST_FOREACH (boost::shared_ptr<BaseClass> en, baseobjects)
    {
        boost::shared_ptr<DerivedClass> ptr = boost::dynamic_pointer_cast<DerivedClass>(en);

        //Error when push_back. Instead of ptr, I get 0
        result.push_back(ptr);
    }

Thanks.