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c++c++11destructorvirtual-destructor
pasha
pasha

Reputation: 2115

C++: Can the destructor be the only virtual function in a class?

I read that the destructor should be declared virtual only if there is virtual function in a class. Is this a requirement or is it possible to do otherwise?

Upvotes: 1

Views: 137

Answers (1)

Guillaume Racicot
Guillaume Racicot

Reputation: 41780

You should have virtual destructors if you intend to use your class in a polymorphic setting. If you don't plan to use polymorphism and polymorphic destruction (destruction through a base class) then you don't need a virtual destructor.

Usually, we use classes in a polymorphic setting when there are virtual functions. Having no virtual functions would force to use casts when using the classes. At that point, I would recommend to simply use a variant, which don't require virtual destructors at all.

With all that said, if the only operation you want to expose polymorphically is destruction, it could still be useful in some cases.

Upvotes: 5

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