What will happen if a virtual function is declared to be virtual again in a derived class?

[Xiangliang Meng]

Hi, all.

What will happen if a virtual function is declared to be virtual again in a
derived class? Any harm?

Best Regards,

Xiangliang Meng

 

[E. Robert Tisdale]

What will happen if a virtual function
is declared to be virtual again in a derived class? Any harm?

No harm.
In fact, I recommend it.

 

[Jack Klein]

Hi, all.

What will happen if a virtual function is declared to be virtual again in a
derived class? Any harm?

Best Regards,

Xiangliang Meng

No harm at all. Any function defined as virtual in a base class is
always virtual in derived classes, whether you use the virtual keyword
in the derived class or not. Most experienced C++ programmers seem to
prefer using the virtual keyword in the derived class for
documentation purposes.