The virtual keyword is used to modify a method , property, indexer, or event declaration and allow for it to be overridden in a derived class. For example, this method can be overridden by any class that inherits it:
C # virtual method is a method that can be redefined in derived classes. In C #, a virtual method has an implementation in a base class as well as derived the class. It is used when a method's basic functionality is the same but sometimes more functionality is needed in the derived class.
A virtual function is a member function that you expect to be redefined in derived classes. When you refer to a derived class object using a pointer or a reference to the base class, you can call a virtual function for that object and execute the derived class's version of the function.
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When you refer to a derived class object using a pointer or a reference to the base class, you can call a virtual function for that object and execute the derived class's version of the function. Virtual functions ensure that the correct function is called for an object, regardless of the type of reference (or pointer) used for function call.
C++11 added two keywords that allow to better express your intentions with what you want to do with virtual functions: override and final. They allow to express your intentions both to fellow humans reading your code as well as to the compiler.
In object-oriented programming, in languages such as C++, and Object Pascal, a virtual function or virtual method is an inheritable and overridable function or method for which dynamic dispatch is facilitated. This concept is an important part of the (runtime) polymorphism portion of object-oriented programming (OOP).
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).
Virtual methods and Abstract Class The main objective of virtual method is that, you can redefine it in one or more derived classes. You can use virtual keyword with method , property, indexer, or event. It allows these members to be overridden in a derived class.
You need virtual methods for safe downcasting, simplicity, and conciseness. That's what virtual methods do: they downcast safely, with apparently simple and concise code, avoiding the unsafe manual casts in the more complex and verbose code that you otherwise would have.