Ejemplo

class Base { public: void fnc(); }; class Derived: public Base { public: void fnc(){} }; int main(){ Derived d; Base *basePtr = &d; Derived *derivedPtr = &d; basePtr->fnc();//calls Base::fnc() derivedPtr->fnc();  //calls Derived::fnc() return 0; }

Solución

No altere temporalmente las funciones no virtuales. Cambie el diseño para no utilizar la clase  básica, o convierta la función de clase básica en virtual para garantizar un comportamiento polimórfico. class Base { public: virtual void fnc(); }; class Derived: public Base { public: void fnc(){} }; int main(){ Derived d; Base *basePtr = &d; Derived *derivedPtr = &d; basePtr->fnc();//calls Derived::fnc() derivedPtr->fnc();  //calls Derived::fnc() return 0; }