1522protected Members in .NET framework

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Theprotected access label can be thought of as a blend of private and public: Likeprivate members, protected members are inaccessible to users of the class Likepublic members, the protected members are accessible to classes derived from this class In addition, protected has another important property: A derived object may access the protected members of its base class only through a derived object The derived class has no special access to the protected members of base type objects As an example, let's assume that Bulk_item defines a member function that takes a reference to a Bulk_item object and a reference to an Item_base object This function may access the protected members of its own object as well as those of its Bulk_item parameter However, it has no special access to the protected members in its Item_base parameter:
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void Bulk_item::memfcn(const Bulk_item &d, const Item_base &b) { // attemptPrimer,protected member C++ to use Fourth Edition double Stanley= price;Jos e Lajoie, usesthis->price // ok: By ret B Lippman, ret = dprice; // ok: usesprice from aBulk_item object Barbara E Moo ret = bprice; // error: no access to price from an Item_base } Publisher:Addison Wesley
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Professional Pub Date: February 14, 2005 Print ISBN: 0-201-72148-1 The use of dprice is okay, because the reference to price is through an object of type Bulk_item The Pages: 912
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use of bprice is illegal Table ofContents | Index
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because Bulk_item has no special access to objects of type Item_base
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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 In the absence of inheritance, a class has two kinds of users: members of the Examples that take advantage of the library, and explain the features of C++, also show how to make the best use of the class itself and the users of that class This separation between kinds of users is language As in its previous editions, the book's authoritative discussion of fundamental C++ concepts and techniques makes reflected in the division of the class into private and public access levels Users it a valuable resource even for more experienced programmersProgram Faster and More Effectively with This Rewritten may access only the public interface; class members and friends may access both Classic Restructured for quicker learning, using the C++ standard library Updated to teach the most current programming thepublic and private members 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 Under inheritance, there is now a third kind of user of a class: programmers who learned Authoritative and comprehensive in its coverageThe source code for the book's extended examples is available on will define new classes that are derived from the class The provider of a derived the Web at the address below
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Key Concept: Class Design and Protected Members
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class often (but not always) needs access to the (ordinarily private) base-class implementation To allow that access while still preventing general access to the implementation, an additional access label, protected, is provided The data and function members in a protected section of a class remain inaccessible to the general program, yet are accessible to the derived class Anything placed within a private section of the base class is accessible only to the class itself and its friends The private members are not accessible to the derived classes
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When designing a class to serve as a base class, the criteria for designating a member as public do not change: It is still the case that interface functions should bepublic and data generally should not be public A class designed to be inherited from must decide which parts of the implementation to declare as protected and which should be private A member should be made private if we wish to prevent subsequently derived classes from having access to that member A member should be made protected if it provides an operation or data that a derived class will need to use in its implementation In other words, the interface to the derived type is the combination of both the protected and public members
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