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C++ Primer, Fourth Edition
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// function By Stanley B Lippman,Jos e Lajoie, with an Item_base reference parameter Barbara E Moo double print_total(const Item_base&, size_t); of base type Item_base item; // object Publisher:Addison Wesley // ok: use pointer or reference to Item_base to refer to anItem_base object Professional print_total(item, 10); // passes reference to anItem_base object Pub = &item; 2005 Item_base *pDate: February 14,// ppoints to an Item_base object
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Print ISBN: 0-201-72148-1 Pages: 912 Bulk_item bulk; // object of derived type Table of // ok: can bind a pointer or reference to Item_base to a Bulk_item object Contents | Index print_total(bulk, 10); // passes reference to the Item_base part ofbulk p = &bulk; // ppoints to the Item_base part ofbulk 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 This code means to write usefulbase-type pointerhaving to masteran object of the base type and to an object of the readers the uses the same programs without first to point to every language detail Highlighting today's best derived type It alsoto write programs that that expects built quickly, andto the base type, passing an object of the practices, they show how calls a function are safe, can be a reference yet offer outstanding performance base-class typeadvantage ofpassing an object the features of C++, type Both uses are fine, use of the every Examples that take and also the library, and explain of the derived also show how to make the best because derived object previousbase part book's authoritative discussion of fundamental C++ concepts and techniques makes language As in its has a editions, the it a valuable resource even for more experienced programmersProgram Faster and More Effectively with This Rewritten Because we can use a base-type pointer orstandard library Updated to teach the most currentobject, when we use a reference to refer to a derived-type programming Classic Restructured for quicker learning, using the C++ base-type reference or pointer, we don't learningthe that emphasize object to which the pointer or reference is know aids type of the important points, warn about common styles and program design techniques Filled with new bound: A base-type reference or pointer might refer to tips Completeof base type orreinforce skills of derived an object with exercises that an object pitfalls, suggest good programming practices, and provide general usage type Regardlessand comprehensive intype the object has, the compilerextended the object as if it is a base type of which actual its coverageThe source code for the book's treats examples is available on learned Authoritative object at the address derived object as if it were a base is safe, because every derived object has a base Treating a below the Web
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subobject Also, the derived class inherits the operations of the base class, meaning that any operation that might be performed on a base object is available through the derived object as well
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The crucial point about references and pointers to base-class types is that thestatic typethe type of the reference or pointer, which is knowable at compile timeand the dynamic typethe type of the object to which the pointer or reference is bound, which is knowable only at run timemay differ
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Calls to virtual Functions May Be Resolved at Run time
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Binding a base-type reference or pointer to a derived object has no effect on the underlying object The object itself is unchanged and remains a derived object The fact that the actual type of the object might differ from the static type of the reference or pointer addressing that object is the key to dynamic binding in C++ When a virtual function is called through a reference or pointer, the compiler generates code to decide at run time which function to call The function that is called is the one that corresponds to the dynamic type As an example, let's look again at the print_total function:
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// calculate and print price for given number of copies, applying any discounts void print_total(ostream &os, const Item_base &item, size_t n) {
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os << "ISBN: " << itembook() // callsItem_base::book << "\tnumber sold: " << n << "\ttotal price: " // virtual call: which version ofnet_price to call is resolved at run time C++ Primer, Fourth Edition << itemnet_price(n) << endl;
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By Stanley B Lippman,Jos e Lajoie, Barbara E Moo Publisher:Addison Wesley Professional Because the item parameter is a reference and net_price is virtual, the version of net_price that is Pub Date: February 14, 2005 called in itemnet_price(n) depends at run time on the actual type of the argument bound to the item Print ISBN: 0-201-72148-1 parameter: Pages: 912
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