return value inheritance

return_value_inheritance.cpp

#include <iostream>

class Super{
public:
    virtual void func(){
        std::cout << "super" << std::endl;
    }

    virtual Super* someFunc(){
        std::cout << "Super::someFunc()" << std::endl;
        return nullptr;
    }
};

class Sub: public Super{
public:
    void func() override{
        std::cout << "sub" << std::endl;
    }
    virtual Sub* someFunc()override{
        std::cout << "Sub::someFunc()" << std::endl;
        return nullptr;
    }
};

int main(){
    Super* a = new Sub;
    a->func();
    a->someFunc();
    delete a;
    return 0;
}