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C++ Primer, Fourth Edition By Stanley B Lippman,Jos e Lajoie, Barbara E Moo Publisher:Addison Wesley Professional Pub Date: February 14, 2005 Print ISBN: 0-201-72148-1 Pages: 912
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Table of Contents | Index
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This popular tutorial introduction to standard C++ has been completely updated, reorganized, and rewritten to help programmers the requirement that an intermediate base class specify its inheritance as virtual In practice,learn the language faster and use it in a more modern, effective wayJust as C++ has evolved since the last rarely edition, any the authors' approach to teaching it They now introduce the C++ standard library from the beginning, giving causesso has problems Ordinarily, a class hierarachy that uses virtual inheritance is designed at one readers the means to write useful programs project design group It is exceedingly rare for today's best time by either one individual or a without first having to master every language detail Highlighting a class to be practices, they show how to write programs that a safe, can be built one and yet offer classes and in which developed independently that needs arevirtual base inquickly,of its base outstanding performance the Examples that take advantage of the library, and explain the features of C++, also show how to developer of the new base class cannot change the existing hierarchy 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 A base Authoritative and comprehensive in its coverageThe source code forinheritance by modifying its declaration learned class is specified as being derived through virtual the book's extended examples is available on with the keyword virtual For example, the following declarations make ZooAnimal a virtual base the Web at the address below
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1736 Virtual Base Class Declaration
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class of both Bear and Raccoon:
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// the order of the keywords public and virtual is not significant class Raccoon : public virtual ZooAnimal { /* */ }; class Bear : virtual public ZooAnimal { /* */ };
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Specifying virtual derivation has an impact only in classes derived from the class that specifies a virtual base Rather than affecting objects of the derived class' own type, it is a statement about the derived class' relationship to its own, future derived class
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Thevirtual specifier states a willingness to share a single instance of the named base class within a subsequently derived class Any class that can be specified as a base class also could be specified as a virtual base class A virtual base may contain any class element normally supported by a nonvirtual base class
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Normal Conversions to Base Are Supported
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An object of the derived class can be manipulated as usual through a pointer or a reference to a
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base-class type even though the base class is virtual For example, all of the following Panda base class conversions execute correctly even though Panda inherits its ZooAnimal part as a virtual base:
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C++ Primer, Fourth Edition
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void dance(const B Lippman,Jos e Lajoie, By Stanley Bear*); void rummage(const Raccoon*); Barbara E Moo ostream& operator<<(ostream&, const ZooAnimal&); Panda ying_yang; Addison Wesley Publisher: Professional // ok: converts address to pointer to Bear dance(&ying_yang); Pub Date: February 14, 2005 rummage(&ying_yang); // ok: converts address to pointer to Raccoon Print ISBN: cout << ying_yang;0-201-72148-1 ying_yang as aZooAnimal // ok: passes
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Pages: 912
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Table of Contents | Index
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Visibility of Virtual Base-Class Members
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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 virtual modern, effective wayJust as C++ has evolved since the do Multiple-inheritance hierarchies using in a more bases pose fewer ambiguity problems than last those edition, so has the inheritance without virtual authors' approach to teaching it They now introduce the C++ standard library from the beginning, giving readers the means to write useful programs without first having to master every language detail Highlighting today's best 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 Members in the shared virtual base can Updated to teach the most current programming Classic Restructured for quicker learning, using the C++ standard librarybe accessed unambiguously and directly Similarly, if a member that emphasize important points, warn about styles and program design techniques Filled with new learning aidsfrom the virtual base is redefined common along only one derivation path, then that redefined with exercises that reinforce skills pitfalls, suggest good programming practices, and provide general usage tips Complete member can be accessed directly Under a nonvirtual derivation, both kinds of access learned Authoritative and comprehensive in its coverageThe source code for the book's extended examples is available on would be the Web at the address below ambiguous
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Assume a member named X is inherited through more than one derivation path There are three possibilities:
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1 If in each path X represents the same virtual base class member, then there is no ambiguity because a single instance of the member is shared 2 If in one path X is a member of the virtual base class member and in another path X is a member of a subsequently derived class, there is also no ambiguitythe specialized derived class instance is given precedence over the shared virtual base class instance 3 If along each inheritance path X represents a different member of a subsequently derived class, then the direct access of the member is ambiguous As in a nonvirtual multiple inheritance hierarchy, ambiguities of this sort are best resolved by the class providing an overriding instance in the derived class
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C++ Primer, Exercises Section Fourth Edition 1736 By Stanley B Lippman,Jos e Lajoie, Barbara E Moo Publisher:Addison Wesley Exercise Given the following class hierarchy, which inherited members Professional 1733: Date:be accessed without qualification from within the VMI class Pub can February 14, 2005 Print Which0-201-72148-1 ISBN: require qualification Explain your reasoning Pages: 912