Pass base pointer reference

Question

Please refer code below:

https://code.sololearn.com/cl48KxgAsSq1

Can we achieve the update method which takes base pointer as reference? Doing so works fine in case of Base* pb , but getting compile time error for scenario of Derived* pb.

How to achieve this?

Answer 1

This is because your Derived* pointer gets casted to a Base* on line 48. Since the casted pointer is an rvalue, you can't pass it to a function that takes lvalue reference.

Assigning the Derived* pointer to a Base* pointer first and then passing that will work
https://code.sololearn.com/cEpYOhei3A1W/?ref=app

Answer 2

I ran it just now and got no error. If I understood the code correctly, everything worked fine.
Could you pls elaborate on the issue?

Answer 3

Change update function signature as below and you will get an error:

void Update(Base*& pb)