of Contents | Index in .NET framework

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Table of Contents | Index
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Inheritance
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This popular tutorial introduction to standard C++ has been completely updated, reorganized, and rewritten to help programmers lets us define classes that model modern, effective wayJust types, sharing since the Inheritancelearn the language faster and use it in a more relationships among as C++ has evolved what is last edition, so and specializing only that which is inherently different Members defined by the base common has the authors' approach to teaching it They now introduce the C++ standard library from the beginning, giving readers the inherited by its programs without first having derived class can use, without change, those class are means to write useful derived classes The to master every language detail Highlighting today's best practices, they show how to write programs the specifics of the derived yet offer outstanding performance operations that do not depend onthat are safe, can be built quickly, and type It can redefine those Examples functions that of depend on its type, specializing the function make the into account member that take advantage dothe library, and explain the features of C++, also show how to to take best use of the language As in its previous editions, the book's Finally, a derived class may C++ concepts and techniques makes the peculiarities of the derived type authoritative discussion of fundamentaldefine additional members it a valuable resource even for from its base class beyond those it inherits 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
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Classes related design techniques Filled with newdescribed as forming an inheritance hierarchy styles and program by inheritance are often learning aids that emphasize important points, warn about common There is one good programming practices, and provide general usageall the other classes inherit, directly or pitfalls, suggest class, referred to as the root, from which tips Complete with exercises that reinforce skills indirectly In ourand comprehensive in its coverageThedefine code for the book'swhich we'll name available on , learned Authoritative bookstore example, we will source a base class, extended examples is Item_base to representaddress below the Web at the undiscounted books From Item_base we will inherit a second class, which we'll nameBulk_item, to represent books sold with a quantity discount At a minimum, these classes will define the following operations: an operation named book that will return the ISBN an operation named net_price that returns the price for purchasing a specified number of copies of a book Classes derived from Item_base will inherit the book function without change: The derived classes have no need to redefine what it means to fetch the ISBN On the other hand, each derived class will need to define its own version of the net_price function to implement an appropriate discount pricing strategy In C++, a base class must indicate which of its functions it intends for its derived classes to redefine Functions defined as virtual are ones that the base expects its derived classes to redefine Functions that the base class intends its children to inherit are not defined as virtual Given this discussion, we can see that our classes will define three (const) member functions: A nonvirtual function, std::string book() , that returns the ISBN It will be defined by Item_base and inherited by Bulk_item Two versions of the virtual function, double net_price(size_t), to return the total price for a given number of copies of a specific book Both Item_base and Bulk_item will define their own versions of this function
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Dynamic Binding
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Dynamic binding lets us write programs that use objects of any type in an inheritance hierarchy without caring about the objects' specific types Programs that use these classes need not distinguish between functions defined in the base or in a derived class
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C++ Primer, Fourth Edition By Stanley B Lippman,Jos e Lajoie, For example, our bookstore application would let a customer select several books in a single Barbara E was sale When the customerMoo done shopping, the application would calculate the total due One part of figuring the final bill would be to print for each book purchased a line reporting Publisher:Addison for that the total quantity and sales priceWesley portion of the purchase Professional
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We might definePub Date: February 14, 2005 a function named print_total to manage this part of the application The print_total function, given an item and a count, should print the ISBN and the total price for Print ISBN: 0-201-72148-1 purchasing the given number of copies of that particular book The output of this function Pages: 912 should look like: Table of Contents | Index ISBN: 0-201-54848-8 number sold: 3 total price: 98 ISBN: 0-201-82470-1 number sold: 5 total price: 2025 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 function programs that are safe, can like the following: Our print_total how to writemight look something 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 // resource and for more experienced programmersProgram Faster and More Effectively with This Rewritten it a valuablecalculate evenprint price for given number of copies, applying any discounts Classicvoid print_total(ostream &os, standard library Updated to teach the most current programming Restructured for quicker learning, using the C++ const with new learning aids that emphasize important points, warn about common styles and program design techniques FilledItem_base &item, size_t n) pitfalls,{ suggest good programming practices, and provide general usage tips Complete with exercises that reinforce skills os << "ISBN: " << its coverageThe source code for the book's extended learned Authoritative and comprehensive in itembook() // callsItem_base::book examples is available on << "\tnumber sold: " << n << "\ttotal price: " the Web at the address below // virtual call: which version ofnet_price to call is resolved at run time << itemnet_price(n) << endl; }
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The function's work is trivial: It prints the results of calling book and net_price on its item parameter There are two interesting things about this function First, even though its second parameter is a reference to Item_base, we can pass either an Item_base object or a Bulk_item object to this function Second, because the parameter is a reference and the net_price function is virtual, the call to net_price will be resolved at run time The version of net_price that is called will depend on the type of the argument passed to print_total When the argument to print_total is a Bulk_item, the version of net_price that is run will be the one defined in Bulk_item that applies a discount If the argument is an Item_base object, then the call will be to the version defined by Item_base
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In C++, dynamic binding happens when a virtual function is called through a reference (or a pointer) to a base class The fact that a reference (or pointer) might refer to either a base- or a derivedclass object is the key to dynamic binding Calls to virtual functions made through a reference (or pointer) are resolved at run time: The function that is called is the one defined by the actual type of the object to which the reference (or pointer) refers
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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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