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Table of Contents | Index
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Refactoring involves redesigning a class hierarchy to move operations and/or data from one class to another Refactoring happens most often when classes are redesigned to add new functionality or handle other changes in that application's requirements
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This popular tutorial introduction to standard C++ has been completely updated, reorganized, and rewritten to help Refactoringis common in and applications It is noteworthy C++ even programmers learn the language fasterOO use it in a more modern, effective wayJust asthathas evolved since the last though we changed the to teaching it They now introduce the C++ standard library from the beginning, giving edition, so has the authors' approachinheritance hierarchy, code that uses the Bulk_item or Item_base classes would not need to change However, when readers the means to write useful programs without first having to master every language detail Highlighting today's best classes are refactored, or changed in can other way, any code that uses practices, they show how to write programs that are safe,anybe built quickly, and yet offer outstanding performance those that take advantage of recompiled Examplesclasses must bethe 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 to define library Updated to class: To implement this design, we first needC++ standard the Disc_itemteach 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 Authoritativehold comprehensive in its coverageThe source code for the book's extended examples is available on // class to and discount rate and quantity the Web at the address below implement pricing strategies using these data // derived classes will
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class Disc_item : public Item_base { public: Disc_item(const std::string& book = "", double sales_price = 00, std::size_t qty = 0, double disc_rate = 00): Item_base(book, sales_price), quantity(qty), discount(disc_rate) { } protected: std::size_t quantity; // purchase size for discount to apply double discount; // fractional discount to apply };
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This class inherits from Item_base and defines its own members, discount and quantity Its only member function is the constructor, which initializes its Item_base base class and the members defined by Disc_item Next, we can reimplement Bulk_item to inherit from Disc_item, rather than inheriting directly fromItem_base:
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// discount kicks in when a specified number of copies of same book are sold // the discount is expressed as a fraction to use to reduce the normal price class Bulk_item : public Disc_item { public: Bulk_item(const std::string& book = "", double sales_price = 00, std::size_t qty = 0, double disc_rate = 00): Disc_item(book, sales_price, qty, disc_rate) { } // redefines base version so as to implement bulk purchase discount policy double net_price(std::size_t) const;
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C++ Primer, Fourth Edition By Stanley has a direct Lajoie, TheBulk_item class now B Lippman,Jos ebase class,Disc_item, and an indirect base class, Item_base Each Barbara E Moo Bulk_item object has three subobjects: an (empty) Bulk_item part and a Disc_item subobject, which in turn has an Item_base base subobject Publisher:Addison Wesley Professional Even though Bulk_item has no data members of its own, it defines a constructor in order to obtain values to Pub Date: February 14, 2005 members use to initialize its inherited Print ISBN: 0-201-72148-1
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A derived constructor 912 initialize only its immediate base class Naming Item_base in the Pages: may Bulk_item constructor initializer would be an error 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 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 The reason that a constructor can initialize only its immediate base class Examples that take advantage of the library, and explain the features of C++, also show how to make the best use of the is that each class defines its own interface When we define Disc_item, we language As in its previous editions, the book's authoritative discussion of fundamental C++ concepts and techniques makes specify how to initialize a Disc_item by defining its constructors Once a it a valuable resource even for more experienced programmersProgram Faster and More Effectively with This Rewritten class has defined its interface, all interactions with objects of that class Classic Restructured for quicker learning, using the C++ standard library Updated to teach the most current programming should be through that interface, even when those objects are part of a styles and program design techniques Filled with new learning aids that emphasize important points, warn about common derived object 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 For similar reasons, derived-class constructors may not initialize and the Web at the address below
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