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24 de sept. de 2011 · If a virtual function is marked with the virt-specifier override and does not override a member function of a base class, the program is ill-formed. [ Example: struct B {. virtual void f(int); }; struct D : B {. void f(long) override; // error: wrong signature overriding B::f. void f(int) override; // OK.
3 de feb. de 2016 · If you have a Base* variable, then calling non-virtual functions will call the Base functions. That's the difference between virtual and non-virtual; calling a virtual function always calls the function that is appropriate for the object.
1 de jun. de 2022 · The virtual specifier specifies that a non-static member function is virtual and supports dynamic dispatch. It may only appear in the decl-specifier-seq of the initial declaration of a non-static member function (i.e., when it is declared in the class definition).
The non-virtual interface pattern ( NVI) controls how methods in a base class are overridden. Such methods may be called by clients and overridable methods with core functionality. [1] It is a pattern that is strongly related to the template method pattern.
When you call a non-virtual function, the compiler obviously doesn’t use the virtual-function mechanism. Instead it calls the function by name, using the fully qualified name of the member function.
11 de abr. de 2023 · So polymorphic behaviour works even when a virtual function is called inside a non-virtual function. The output can be guessed from the fact that the function to be called is decided at run-time using the vptr and vtable.
Experienced C++ programmers will sometimes redefine a non-virtual function for efficiency (e.g., if the derived class implementation can make better use of the derived class’s resources) or to get around the hiding rule.
