namebook is found in the Item_base class The reference is resolved successfully in VS .NET

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namebook is found in the Item_base class The reference is resolved successfully
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The static type of an object, reference, or pointer determines the actions that the object can perform Even when the static and dynamic types might differ, as can happen when a reference or pointer to a base type is used, the static type determines what members can be used As an example, we might add a member to the Disc_item class that returns a pair holding the minimum (or maximum) quantity and the discounted price:
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class Disc_item : public Item_base { public: std::pair<size_t, double> discount_policy() const { return std::make_pair(quantity, discount); } // other members as before };
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We can access discount_policy only through an object, pointer, or reference of type Disc_item or a class derived from Disc_item:
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Bulk_item bulk; Bulk_item *bulkP = &bulk; Item_base *itemP = &bulk; bulkP->discount_policy(); itemP->discount_policy();
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// // // //
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ok: static and dynamic types are the same ok: static and dynamic types differ ok: bulkP has type Bulk_item* error: itemP has type Item_base*
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The call through itemP is an error because a pointer (reference or object) to a base type can C++ Primer, of an object access only the base partsFourth Edition and there is no discount_policy member defined in the base class By Stanley B Lippman,Jos e Lajoie,
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Barbara E Moo Publisher:Addison Wesley Professional Pub Date: February 14, 2005 Print ISBN: 0-201-72148-1 Pages: 912
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Exercises Section 1551
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Table of Contents | Index
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Exercise Redefine your Item_base hierarchy to include a Disc_item 1521: class This popular tutorial introduction to standard C++ has been completely updated, reorganized, and rewritten to help
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programmers learn the language faster and use it in a more modern, effective wayJust as C++ has evolved since the last edition, so Exercise RedefineBulk_item They now introduceyouC++ standard library from the beginning, giving has the authors' approach to teaching it and the class the implemented in the 1522: readers the means to writeexercises from Section 1523 (p 567) that represents a useful programs without first having to master every language detail Highlighting today's best limited discount strategy to built quickly, and yet offer outstanding performance practices, they show how to write programs that are safe, can beinherit from Disc_item 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 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 learned Authoritative and comprehensive in its coverageThe source code for the book's extended examples is available on the Web at a address below Although thebase-class member can be accessed directly as if it were a member of the derived
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class, the member retains its base-class membership Normally we do not care which actual class contains the member We usually need to care only when a base- and derived-class member share the same name
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A derived-class member with the same name as a member of the base class hides direct access to the base-class member
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struct Base { Base(): mem(0) { } protected: int mem; }; struct Derived : Base { Derived(int i): mem(i) { } // initializesDerived::mem int get_mem() { return mem; } // returnsDerived::mem protected: int mem; // hides mem in the base };
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The reference to mem inside get_mem is resolved to the name inside Derived Were we to write
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Derived d(42); cout << dget_mem() <<Edition C++ Primer, Fourth endl;
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// prints 42
By Stanley B Lippman,Jos e Lajoie, Barbara E Moo then the output Publisher:Addison Wesley would be 42 Professional Pub Date: February 14, 2005 Print ISBN: 0-201-72148-1 Using the Scope Operator to Access Hidden Pages: 912