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 …

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 …

Nov 5, 2014 · How are virtual functions implemented at a deep level? From "Virtual Functions in C++": Whenever a program has a virtual function declared, a v - table is constructed for the …

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 …

The virtual keyword is not necessary in the derived class. Here's the supporting documentation, from the C++ Draft Standard (N3337) (emphasis mine): 10.3 Virtual functions 2 If a virtual …

313 Calling virtual functions from a constructor or destructor is dangerous and should be avoided whenever possible. All C++ implementations should call the version of the function defined at …

Nov 5, 2009 · The first definition with 'virtual' is the one that matters. That function from base is from then on virtual when derived from, which means you don't need 'virtual' for …

A pure virtual function must be implemented in a derived type that will be directly instantiated, however the base type can still define an implementation. A derived class can explicitly call the …

Derived classes do not have to implement all virtual functions themselves. They only need to implement the pure ones. 1 That means the Derived class in the question is correct. It inherits …

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 …