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Type:
Improvement
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Resolution: Unresolved
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Priority:
Major - P3
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None
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Affects Version/s: None
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Component/s: None
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Labels:None
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Service Arch
Each of the forms of:
virtual void f() override final; virtual void f() override; virtual void f() final; virtual void f(); void f() override final; void f() override; void f() final; void f();
means something subtly and slightly different.
Each means:
virtual void f() override final; // is virtual, must override, cannot be overriden virtual void f() override; // is virtual, must override, may be overriden virtual void f() final; // is virtual, may be overriden virtual void f(); // is virtual void f() override final; // require virtual, must override, cannot be overriden void f() override; // require virtual, must override void f() final; // require virtual, cannot be overriden void f(); // may or may not be virtual.
Some things to note:
- The `virtual override final` form is the same as the `override final` form which is the same as the `final` form.
- The `virtual override` form is the same as the `override` form.
- The `virtual final` form may be a 1st generation function!
- The `virtual` form may ALSO be a 1st generation function!
Looking at all of the forms again:
virtual void f() override final; // Superfluous syntax for `void f() final;` virtual void f() override; // Superfluous syntax for `void f() override;` virtual void f() final; // Dangerous form – may not be overriding virtual void f(); // Not necessarily the 1st generation function, uncertain. void f() override final; // Superfluous syntax for `void f() final;` void f() override; // Tersest syntax for this form. void f() final; // Tersest syntax for this form. void f(); // Uncertain form.
This means that no more than 1 of the keywords `virtual`, `override`, or `final` should be used on a function declaration.