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In C++, virtual methods are declared by prepending the virtual keyword to the function's declaration in the base class. This modifier is inherited by all implementations of that method in derived classes, meaning that they can continue to over-ride each other and be late-bound.
To elaborate on the above example, consider a base class with no virtual functions. Whenever the base class calls another member function, it will always call its own base class functions. When we derive a class from this base class, we inherit all the member variables and member functions that were not overridden (no constructors or destructors).
In computer programming, a virtual method table (VMT), virtual function table, virtual call table, dispatch table, vtable, or vftable is a mechanism used in a programming language to support dynamic dispatch (or run-time method binding).
The C++ language does allow a program to call a destructor ... and deallocator functions from the Standard C++ library ... overriding, virtual pointer subterfuge ...
A Destructor is a method that is called automatically at the end of an object's lifetime, a process called Destruction. Destruction in most languages does not allow destructor method arguments nor return values. Destructors can be implemented so as to perform cleanup chores and other tasks at object destruction.
When overriding one method with another, the signatures of the two methods must be identical (and with same visibility). In C#, class methods, indexers, properties and events can all be overridden. Non-virtual or static methods cannot be overridden. The overridden base method must be virtual, abstract, or override.
I think this article needs a section on Default Virtual Methods. This would qualify the fact that the child has a option of - [1] Override with its own virtual method (polymorph) [2] use Default Virtual Method (in the parent) [3] Override and also use the parents default method This section should also state one or two languages that support this.
In C++, late binding (also called "dynamic binding") refers to what normally happens when the virtual keyword is used in a method's declaration. C++ then creates a so-called virtual table , which is a look-up table for such functions that will always be consulted when they are called.