CODEWITHSUNDEEP
c++polymorphismvtablevirtual-functions
zznn
zznn

Reputation:

vtables for derived, concrete, classes

If I have one base class and I derive 10 different concrete derived classes from it then will each and every concrete derived class have a different vtable?

Upvotes: 1

Views: 1286

Answers (2)

CB Bailey
CB Bailey

Reputation: 792039

If the base class or all of the derived classes have any virtual functions, then yes, usually. Why is it important?

Two classes can only share a vtable if they have an indentical set of virtual functions. So a derived class can only share a vtable with a base class if it doesn't override any virtual functions.

A derived class can't share a vtable with any other derived class unless they both don't override any functions of the same base class as - even if implemented in the same way - the member functions of one derived class are a different type from the member functions of a different derived class.

Upvotes: 4

EFraim
EFraim

Reputation: 13028

Depends on whether your derived classes override/declare any virtual methods.

Upvotes: 0

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