Multiple ChoiceHard 45s
final on class disables devirtualization?
Marking a class or function `final` may let the compiler:
Options
- 1Remove the vtable entirely from the object's layout, shrinking every instance by one pointer.
- 2Devirtualize calls (skip vtable lookup) when it can prove the dynamic type through the static type.
- 3Convert all of the class's methods to static functions, since dispatch can be resolved at compile time.
- 4Guarantee that the class cannot have a non-virtual destructor, since final classes forbid virtual bases.
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