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Define a vector to hold objects of type Item_base and copy a number of objects of type Bulk_item into the vector Iterate over the vector has generate the net_price for the elements This popular tutorial introduction to standard C++and been completely updated, reorganized, and rewritten to help in the container programmers learn the language faster and use it in a more modern, effective wayJust as C++ has evolved since the last
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edition, so has the authors' approach to teaching it They now introduce the C++ standard library from the beginning, giving Exercise useful programs without first but to master every language detail Highlighting readers the means to writeRepeat your program,havingthis time store pointers to objects today's best 1529: of type Item_base safe, can be the resulting sum practices, they show how to write programs that are Compare 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 Exercise Explain any discrepancy in the amount generated by the language As in its previous editions, the book's authoritative discussion of fundamental C++ concepts and techniques makes 1530: it a valuable resource evenprevious two programs If there is Faster and More Effectively with This Rewritten for more experienced programmersProgram no discrepancy, explain why there using the C++ Classic Restructured for quicker learning,isn't one 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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Exercise 1528:
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C++ Primer, Fourth Edition By Stanley B Lippman,Jos e Lajoie, 158 Handle Classes and Inheritance Barbara E Moo Publisher:Addison Wesley One of the ironies of object-oriented programming in C++ is that we cannot use objects to Professional support it Instead, we must use pointers and references, not objects For example, in the Pub Date: following code fragment, February 14, 2005 Print ISBN: 0-201-72148-1 Pages: 912
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void get_prices(Item_base object, const Item_base *pointer, const Item_base &reference) { This popular tutorial introduction to standard C++ has been completely updated, reorganized, and rewritten to help // which version ofnet_price is called is determined at run time programmers coutthe language faster and use it in a more modern, effective wayJust as C++ has evolved since the last learn << pointer->net_price(1) << endl; edition, so has the authors' approach to teaching it They now introduce the C++ standard library from the beginning, giving cout << referencenet_price(1) << endl;
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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 // always invokes Item_base::net_price Examples that take advantage of the library, and explain the features of C++, also show how to make the best use of the cout << objectnet_price(1) << endl; 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 the invocations through pointer and reference are resolved at run time based on the dynamic learned Authoritative and comprehensive in types of the object to which they its coverageThe source code for the book's extended examples is available on are bound the Web at the address below
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Unfortunately, using pointers or references puts a burden on the users of our classes We saw one such burden in the previous section that discussed the inter-actions between objects of inherited types and containers A common technique in C++ is to define a so-called cover or handleclass The handle class stores and manages a pointer to the base class The type of the object to which that pointer points will vary; it can point at either a base- or a derived-type object Users access the operations of the inheritance hierarchy through the handle Because the handle uses its pointer to execute those operations, the behavior of virtual members will vary at run time depending on the kind of object to which the handle is actually bound Users of the handle thus obtain dynamic behavior but do not themselves have to worry about managing the pointer Handles that cover an inheritance hierarchy have two important design considerations: As with any class that holds a pointer (Section 135, p 492), we must decide what to do about copy control Handles that cover an inheritance hierarchy typically behave like either a smart pointer (Section 1351, p 495) or a value (Section 1352, p 499) The handle class determines whether the handle interface will hide the inheritance hierarchy or expose it If the hierarchy is not hidden, users must know about and use objects in the underlying hierarchy There is no one right choice among these options; the decisions depend on the details of the hierarchy and how the class designer wants programmers to interact with those class(es) In the next two sections, we'll implement two different kinds of handles that address these design questions in different ways
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