Can I cast a pointer from a unknow type ?

[john_god]

I have a list of pointers that can be from diferent derived classes of BaseClass. I want to duplicate some items who's indexes are in m_listEntities_selected (a list of type int). newPosition() is a virtual member. Can I cast 'entity', since I don't know the type of the item at the specified position?

for(int i=0;i<m_listEntities_selected.size();i++)            
{
    BaseClass *entity = new BaseClass;                    
    entity = dynamic_cast< typeid (m_listEntities.at(m_listEntities_selected[i]) ) >  (m_listEntities.at(m_listEntities_selected.at(i))); // this is the error 
    *entity = *m_listEntities.at(m_listEntities_selected.at(i) );
    entity->newPosition(point3d-point_base_copy);
    m_listEntities.append(entity);        
}

for(int i=0;i<m_listEntities_selected.size();i++)            
{
    BaseClass *entity = new BaseClass;                    
    entity = dynamic_cast< typeid (m_listEntities.at(m_listEntities_selected[i]) ) >  (m_listEntities.at(m_listEntities_selected.at(i))); // this is the error 
    *entity = *m_listEntities.at(m_listEntities_selected.at(i) );
    entity->newPosition(point3d-point_base_copy);
    m_listEntities.append(entity);        
}

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I can solve my problem with a switch case, because I have virtual members in the derived classes that give a string with the type but that will be much less elegant and I will have to modify the switch case every time I create a new derived class. Any sugestion ?