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Exercise 1832: Exercise 1833:
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Reimplement the Queue and QueueItem classes from 16 making QueueItem a nested class inside Queue Explain the pros and cons of the original and the nestedclass version of the Queue design
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C++ Primer, Fourth Edition By Stanley Lippman,Jos e Lajoie, 185 Union: ABSpace-Saving Class Barbara E Moo Publisher: of class A union Aunion is a special kind Addison Wesley may have multiple data members, but at any point Professional in time, only one of the members may have a value When a value is assigned to one member of the union, all Pub Date: February 14, 2005 other members become undefined Print ISBN: 0-201-72148-1
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The amount of storage allocated for a union is at least as much as the amount necessary to Pages: 912 contain its largest Table of Contents | Index data member Like any class, a union defines a new type
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Defining a Union to standard C++ has been completely updated, reorganized, and rewritten to help This popular tutorial introduction
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Unionsso has the convenient way teaching it They now introduce the C++ standard library from the beginning, giving edition, offer a authors' approach to to represent a set of mutually exclusive values that may have different typesto write useful programs without firsthave a process that handles different kinds of readers the means As an example, we might having to master every language detail Highlighting today's best numeric theycharacter data That process might be built quickly, and yet offer outstanding performance practices, or show how to write programs that are safe, can define a union to hold these values:
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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 // resource type for more experienced programmersProgram Faster and More Effectively with This Rewritten it a valuableobjects ofeven TokenValuehave a single member, Classic// which couldquicker learning, using the C++ standard library Updated to teach the most current programming Restructured for be of any of the listed types union TokenValue { styles and program design techniques Filled with new learning aids that emphasize important points, warn about common char cval; pitfalls, suggest good programming practices, and provide general usage tips Complete with exercises that reinforce skills int and comprehensive in its coverageThe source code for the book's extended examples is available on ival; learned Authoritative double below the Web at the address dval;
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Aunion is defined starting with the keyword union, followed by an (optional) name for the union and a set of member declarations enclosed in curly braces This code defines a union namedTokenValue that can hold a value that is either a char, an int , a pointer to char, or a doubleSection 185 (p 795) will look at what it means to omit the union name Like any class, a union type defines how much storage is associated with objects of its type The size of each union object is fixed at compile time: It is at least as large as the size of the union's largest data member
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No Static, Reference, or Class Data Members
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Some, but not all, class features apply equally to unions For example, like any class, a union can specify protection labels to make members public, private, or protected By default, unions behave like structs: Unless otherwise specified, the members of a union are public Aunion may also define member functions, including constructors and destructors However, aunion may not serve as a base class, so a member function may not be virtual Aunion cannot have a static data member or a member that is a reference Moreover, unions cannot have a member of a class type that defines a constructor, destructor, or assignment operator:
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union illegal_members Screen s; // static int is; // int &rfi; //
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