Hello I'm having a bit of trouble with something and I was hoping someone would be able to help me out. I'm using boost interprocess. Here's what I have: class Animal { ... code removed... } class Dog : public Animal { ... code removed... } class Cat : public Animal { ... code removed... } typedef boost::interprocess::allocator<intrusive_ptr<Animal, offset_ptr<Animal> >, managed_shared_memory::segment_manager> ShmemAllocator; typedef vector<intrusive_ptr<Animal, offset_ptr<Animal> >, ShmemAllocator> MyVector; int main(int argc, char * const argv[]) { ..code removed.. managed_shared_memory segment(create_only, "MySharedMemory", 65536); const ShmemAllocator alloc_inst(segment.get_segment_manager()); MyVector *myVector = segment.construct<MyVector>("MyVector")(alloc_inst); intrusive_ptr<Dog, offset_ptr<Dog> > dogPtr(segment.construct<Dog>("DogPtr")()); myVector->push_back(dogPtr); The myVector->push_back(dogPtr) line gives the following error: error: no matching function for call to 'boost::container::vector<boost::interprocess::intrusive_ptr<Animal, boost::interprocess::offset_ptr<Animal> >, boost::interprocess::allocator<boost::interprocess::intrusive_ptr<Animal, boost::interprocess::offset_ptr<Animal> >, boost::interprocess::segment_manager<char, boost::interprocess::rbtree_best_fit<boost::interprocess::mutex_family, boost::interprocess::offset_ptr<void>, 0ul>, boost::interprocess::iset_index> > >::push_back(boost::interprocess::intrusive_ptr<Dog, boost::interprocess::offset_ptr<Dog> >&)' I have been unable to get this to work. Can someone please tell me how to get my dogPtr into my Animal array? I was able to get it to work like this: intrusive_ptr<Animal, offset_ptr<Animal> > animalPtr(dynamic_pointer_cast<Animal>(dogPtr.get())); myVector->push_back(animalPtr); But that's kind of ugly, creating a new variable and all. I'm hoping I don't have to do that. Many thanks