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- Q1755692 subject Q7131220.
- Q1755692 subject Q8268978.
- Q1755692 abstract "A virtual method table, 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).Whenever a class defines a virtual function (or method), most compilers add a hidden member variable to the class which points to an array of pointers to (virtual) functions called the virtual method table (VMT or Vtable). These pointers are used at runtime to invoke the appropriate function implementations, because at compile time it may not yet be known if the base function is to be called or a derived one implemented by a class that inherits from the base class.Suppose a program contains several classes in an inheritance hierarchy: a superclass, Cat, and two subclasses, HouseCat and Lion. Class Cat defines a virtual function named speak, so its subclasses may provide an appropriate implementation (e.g. either meow or roar).When the program calls the speak method on a Cat pointer (which can point to a Cat class, or any subclass of Cat), the calling code must be able to determine which implementation to call, depending on the actual type of object that is pointed to. Because the type of object pointed to by the Cat pointer is not determined at compile-time, the decision as to which branch to take cannot be decided at compile-time.There are a variety of different ways to implement such dynamic dispatch, but the vtable (virtual table) solution is especially common among C++ and related languages (such as D and C#). Languages which separate the programmatic interface of objects from the implementation, like Visual Basic and Delphi, also tend to use the vtable approach, because it allows objects to use a different implementation simply by using a different set of method pointers.".
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- Q1755692 wikiPageWikiLink Q7131220.
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- Q1755692 wikiPageWikiLink Q8268978.
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- Q1755692 comment "A virtual method table, 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).Whenever a class defines a virtual function (or method), most compilers add a hidden member variable to the class which points to an array of pointers to (virtual) functions called the virtual method table (VMT or Vtable).".
- Q1755692 label "Virtual method table".