Mar 6, 2010 · Virtual functions avoid unnecessary typecasting problem, and some of us can debate that why do we need virtual functions when we can use derived class pointer to call the function specific …

Jul 31, 2019 · From Wikipedia's Virtual function ... In object-oriented programming, in languages such as C++, and Object Pascal, a virtual function or virtual method is an inheritable and overridable function …

Nov 8, 2016 · A virtual function makes its class a polymorphic base class. Derived classes can override virtual functions. Virtual functions called through base class pointers/references will be resolved at …

What is the purpose of using the reserved word virtual in front of functions? If I want a child class to override a parent function, I just declare the same function such as void draw(){}. class Pa...

For instance, the function type isn't exactly like the base class function. Or that a maintenance of the base class changes that function's type, e.g. adding a defaulted argument. In the same way, a virtual …

Again you can determine at runtime which function to call using the object of that class (derived or base).But this requires your function at base class must be marked as virtual.

Jun 23, 2016 · The fact that a function from the base can call a virtual method and control is transferred into the derived class is used in the template method design pattern.

Mar 7, 2009 · A virtual method is a type of method where the actual method calls depends on the runtime type of the underlying object. A non-virtual method is a type of method where the actual …

Mar 15, 2016 · @Chris, at the low level, the member function pointer, for virtual functions, contains a vtable index, not an actual function pointer. When the function pointer is invoked the compiler will …

What is the advantage of making a private method virtual in C++? I have noticed this in an open source C++ project: class HTMLDocument : public Document, public CachedResourceClient { private: