std::map unable to handle polymorphism?

Question

When using std::map in c++, is it possible to store inherited classes as their \"base class\" in the map and still being able to call their overloaded methods? See this exam

Answer 1

Its case of Object Slicing. Try to insert with pointers.

In the presence of inheritance copying leads to slicing. That is, if you create a map of base class objects and you try to insert derived class objects into it, the derivedness of the objects will be removed as the objects are copied (via the base class copy constructor) into the map.

Hence, it is recommended to use pointers rather than copies itself.