C++ What's the difference between final & override?

[Digital]

Can anyone explain in laymens terms what is the difference between final & override in a class? Specifically the classes in the sources.

 

[pepsiman]

override specifier (since C++11) - cppreference.com
final specifier (since C++11) - cppreference.com

Using inheritance, the keyword override it overrides/overload/rewrite a virtual inherited function, only if that function doesn't has the final keyword, since it makes non-overridable/constant

#include <iostream>
class A
{
    public:
        void sayHi(); //cannot be overridable because is not virtual

        virtual void sayBye(); //can be overridable because is virtual

        virtual void say() final; //is a virtual function but can not be overridable because is final

       
};

class B : A
{
    public:
        void sayHi() override;
        void sayBye() override;
        void say() override;
};

the code will throw those errors

main.cpp:26:14: error: 'void B::sayHi()' marked override, but does not override
main.cpp:35:14: error: virtual function 'virtual void B::say()'
main.cpp:16:22: error: overriding final function 'virtual void A::say()'

 

[Digital]

So how does final work in comparison to override?

 

[Digital]

bump

 

[Infernum]

any further virtual methods that are inheritable cannot be overridden after you use the final specifier
which is why in his example he has this in class A

virtual void say() final;

in class B you can't override say() because in the parent class it has already been finalized