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The C++ Programming Language Single and Multiple Inheritance in ...

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phic style of programming. i.e. the programmer need not know the actual. type of a class at compiletime. Note C++ is not truly polymorphic ...

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The C++ Programming Language Single and Multiple Inheritance in C++ Douglas C. Schmidt www.cs.wustl.edu schmidtPage 1The C++ ProgrammingLanguageSingle and Multiple Inheritance inC++Douglas C. Schmidtwww.cs.wustl.edu schmidtschmidt@cs.wustl.eduWashington University St. Louis1BackgroundObjectoriented programming is often dened as the combination of Abstract DataTypes ADTs with Inheritance and Dynamic BindingEach concept addresses a dierent aspectof system decomposition:1. ADTsdecomposesystemsintotwodimensionalgrid s of modulesEach module has public and private interfaces2. Inheritancedecomposessystemsintothreedimen sionalhierarchies of modulesInheritance relationships form a lattice"3. Dynamic binding enhances inheritancee.g. deferimplementationdecisionsuntillatein the design phase or even until runtime!2Data Abstraction vs. InheritanceDATA ABSTRACTION(2DIMENTIONAL)DATA ABSTRACTION(2DIMENTIONAL)INHERITANCE(3DIME NTIONAL)3Motivation for InheritanceInheritance allows you to write code tohandle certain cases and allows other developers to write code that handles morespecialized cases while your code continues to workInheritance partitions a system architecture into semidisjoint components thatare related hierarchicallyTherefore wemaybeabletomodifyandorreuse sections of the inheritance hierarchywithout disturbing existing code e.g.Change sibling subtree interfaces i.e. a consequence of inheritanceChange implementation of ancestors i.e. a consequence of data abstraction4Page 2Inheritance OverviewA type called a subclass or derived type can inherit the characteristics of anothertype s called a superclass or base type The term subclass is equivalent to derived typeA derived type acts just like the base typeexcept for an explicit list of:1. SpecializationsChange implementations without changingthe base class interface Most useful when combined with dynamicbinding2. GeneralizationsExtensionsAddnewoperationso rdatatoderivedclasses5Visualizing InheritanceBaseDerived1Deri ...

Source: www.cs.wustl.edu

 

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