vector and handle problem

I followed the example Sales_item presented in handle classes and inheritance, C++ primer 4th,and i replaced mutset with vector, unfortunately, i failed to get the element back correctly after i push_back the Sales_item objs, is it impossible to use vector ??? or other problems??,what's the most important tips when implementing vector or mutset?? thx!!!
what's a mutset?
sorry!
multiset<>
since not all of us have the primer, we dont know the examples...
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