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An unnamed union that is not used to define an object is referred to as an anonymousunion The names of the members of an anonymous union appear in the enclosing scope For example, here is our Token class rewritten to use an anonymous union:
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class Token { public: // indicates which kind of token value is in val enum TokenKind {INT, CHAR, DBL}; TokenKind tok; union { // anonymous union char cval; int ival; double dval; }; };
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Because an anonymous union provides no way to access its members, the members are
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directly accessible as part of the scope where the anonymous union is defined Rewriting our previousswitch to use the anonymous-union version of our class would look like:
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C++ Primer, Fourth Edition
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Token token; By Stanley B Lippman,Jos e Lajoie, switch (tokentok) { Barbara E Moo case Token::INT: tokenival = 42; break; Publisher:Addison Wesley case Token::CHAR: Professional tokencval = February 14, 2005 Pub Date: 'a'; break; case Token::DBL: 0-201-72148-1 Print ISBN: tokendval = 314; break; Pages: 912 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 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 to write useful programs without first having to master everyprotected members, today's best An anonymous union cannot have private or language detail Highlighting practices, they show how to writeanonymousare safe, can be built quickly, and yet offer outstanding performance nor can an programs that union define member functions 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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C++ Primer, Fourth Edition By 186 LocalStanley B Lippman,Jos e Lajoie, Classes Barbara E Moo Publisher:Addison Wesley A class can be defined inside a function body Such a class is called a local class A local Professional class defines a type that is visible only in the local scope in which it is defined Unlike nested Pub Date: February 14, 2005 classes, the members of a local class are severely restricted Print ISBN: 0-201-72148-1 Pages: 912
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Table of Contents | Index
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All members, including functions, of a local class must be
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This popular tutorial introduction to standardinside the class body As a reorganized, and classes to help completely defined C++ has been completely updated, result, local rewritten programmers learn the much less useful thananested classes are language faster and use it in 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 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 In practice, the requirement that membersstandard library Updated to teach theclasscurrent programming Classic Restructured for quicker learning, using the C++ be fully defined within the most limits the complexity of the member functions of a learning aids that emphasize important points, warn about common styles and program design techniques Filled with new local class Functions in local classes are rarely more than asuggest goodof code Beyond that, provide general usage tips Completefor the reader to pitfalls, few lines programming practices, and the code becomes difficult with exercises that reinforce skills understand 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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Similarly, a local class is not permitted to declare static data members, there being no way to define them
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