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We'll define an abstract ZooAnimal class to hold information that is common to all the zoo animals and provides the public interface The Bear class will contain information that is unique to the Bear family, and so on In addition to the actual zoo-animal classes, there are auxiliary classes that encapsulate various abstractions such as endangered animals In our implementation of a Panda class, for example, a Panda is multiply derived from Bear and Endangered
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To support multiple inheritance, the derivation list
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class Bear : public ZooAnimal { };
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is extended to support a comma-separated list of base classes:
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class Panda : public Bear, public Endangered { };
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The derived class specifies (either explicitly or implicitly) the access level public, protected, or private for each of its base classes As with single inheritance, a class may be used as a base class under multiple inheritance only after it has been defined There is no language-imposed limit on the number of base classes from which a class can be derived A base class may appear only once in a given derivation list
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Under multiple inheritance, objects of a derived class contain a base-class subobject (Section Barbara E Moo 1523, p 565) for each of its base classes When we write
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Publisher:Addison Wesley Professional Panda ying_yang("ying_yang"); Pub Date: February 14, 2005 Print ISBN: 0-201-72148-1 Pages: 912
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Table object ying_yang the of Contents | Index
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By Stanley B Lippman,Jos e Lajoie,
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is composed of a Bear class subobject (which itself contains a ZooAnimal base-class subobject), an Endangered class subobject, and the non static data members, if any, declared within the Panda class (see Figure 172)
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This popular tutorial introduction to standard C++ has been completely updated, reorganized, and rewritten to help programmers learn the language faster and use it in a more modern, effective wayJust as C++ has evolved since the last edition, so has the authors' approach to teaching it They now introduce the C++ standard library from the beginning, giving readers the means toFigure 172 without first having to master every language detail Highlighting today's best write useful programs Multiple Inheritance Panda Hierarchy practices, they show how to write programs that are safe, can be built quickly, and yet offer outstanding performance Examples that take advantage of the library, and explain the features of C++, also show how to make the best use of the language As in its previous editions, the book's authoritative discussion of fundamental C++ concepts and techniques makes it a valuable resource even for more experienced programmersProgram Faster and More Effectively with This Rewritten Classic Restructured for quicker learning, using the C++ standard library Updated to teach the most current programming styles and program design techniques Filled with new learning aids that emphasize important points, warn about common pitfalls, suggest good programming practices, and provide general usage tips Complete with exercises that reinforce skills learned Authoritative and comprehensive in its coverageThe source code for the book's extended examples is available on the Web at the address below
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Derived Constructors Initialize All Base Classes
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Constructing an object of derived type involves constructing and initializing all its base subobjects As is the case for inheriting from a single base class (Section 1541, p 580), derived constructors may pass values to zero or more of their base classes in the constructor initializer:
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// explicitly initialize both base classes Panda::Panda(std::string name, bool onExhibit) : Bear(name, onExhibit, "Panda"), Endangered(Endangered::critical) { } // implicitly use Beardefault constructor to initialize the Bearsubobject Panda::Panda() : Endangered(Endangered::critical) { }
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The constructor initializer controls only the values that are used to initialize the base classes, not the order in which the base classes are constructed The base-class constructors are invoked in the order in which they appear in the class derivation list For Panda, the order of base-class initialization is: C++ Primer, Fourth Edition
By Stanley B Lippman,Jos e Lajoie, Barbara E Moo 1 ZooAnimal, Publisher:Addison Wesley up the hierarchy from Panda's immediate base class Bear the ultimate base class Professional 2 Bear, the first immediate base class Pub Date: February 14, 2005 Print ISBN: 0-201-72148-1 3 Endangered, the second immediate base, which itself has no base class Pages: 912