The declaration of memfcn in Derived hides the declaration in Base Not surprisingly, the first in .NET framework

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call through b, which is aBase object, calls the version in the base class Similarly, the second call through d calls the one from Derived What can be surprising is the third call:
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C++ Primer, Fourth Edition By Stanley B Lippman,Jos e Lajoie, dmemfcn(); // error: Derived has no memfcn that takes no arguments Barbara E Moo Publisher:Addison Wesley Professional To resolve this call, the compiler looks for the name memfcn, which it finds in the class Pub Date: February the compiler looks no further This call does not match the Derived Once the name is found, 14, 2005 Print ISBN: 0-201-72148-1 definition of memfcn in Derived, which expects an int argument The call provides no such Pages: error argument and so is in 912
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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 learnRecall that faster and usedeclared in a local scope do not C++ has evolved since the last the language functions it in a more modern, effective wayJust as overload edition, so has the authors' approach to teaching it They now introduce the C++ standard library from the beginning, giving functions defined at global scope (Section 781, p 268) readers the means Similarly, functions defined havingderived classlanguage detail Highlighting today's best to write useful programs without first in a to master every do not overload practices, they show how to write programs in the base When the function is called through members defined that are safe, can be built quickly, and yet offer outstanding performance Examples that takea derived object, the arguments must match a show how to make the best use of the advantage of the library, and explain the features of C++, also version of the language As in its previous editions, the book's authoritative class The fundamental C++ concepts and techniques makes function defined in the derived discussion of base class functions are it a valuable resource even for more experiencedderived does not define the function atwith This Rewritten considered only if the programmersProgram Faster and More Effectively all 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 the address below
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Overloaded Functions
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As with any other function, a member function (virtual or otherwise) can be over-loaded A derived class can redefine zero or more of the versions it inherits
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If the derived class redefines any of the overloaded members, then only the one(s) redefined in the derived class are accessible through the derived type
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If a derived class wants to make all the overloaded versions available through its type, then it must either redefine all of them or none of them Sometimes a class needs to redefine the behavior of only some of the versions in an overloaded set, and wants to inherit the meaning for others It would be tedious in such cases to have to redefine every base-class version in order to redefine the ones that the class needs to specialize Instead of redefining every base-class version that it inherits, a derived class can provide a using declaration (Section 1525, p 574) for the overloaded member A using declaration specifies only a name; it may not specify a parameter list Thus, a using declaration for a base-class member function name adds all the overloaded instances of that function to the scope of the derived-class Having brought all the names into its scope, the derived class
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need redefine only those functions that it truly must define for its type It can use the inherited definitions for the others
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C++ Primer, Fourth Edition By 1554 VirtualStanley B Lippman,Jos e Lajoie, Functions and Scope Barbara E Moo
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Recall that to obtain dynamic binding, we must call a virtual member through a reference or a Publisher:Addison Wesley pointer to a base class When we do so, the compiler looks for the function in the base class Professional Assuming the name Date: February compiler checks that the arguments match the parameters Pub is found, the 14, 2005 We can now understand why virtual functions must have the same prototype in the base and Pages: 912 derived classes If the base member took different arguments than the derived-class member, Table of Contents | Index there would be no way to call the derived function from a reference or pointer to the base type Consider the following (artificial) collection of classes:
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This popular tutorial introduction to standard C++ has been completely updated, reorganized, and rewritten to help class Base { programmers learn the language faster and use it in a more modern, effective wayJust as C++ has evolved since the last edition,public: authors' approach to teaching it They now introduce the C++ standard library from the beginning, giving so has the virtual int fcn(); 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 class D1 : public Base and explain the features of C++, also show how to make the best use of the Examples that take advantage of the library,{ public: language As in its previous editions, the book's authoritative discussion of fundamental C++ concepts and techniques makes // hides fcn more base; this fcn is not virtual it a valuable resource even for in the experienced programmersProgram Faster and More Effectively with This Rewritten int fcn(int); // parameter list differs library Updated to Classic Restructured for quicker learning, using the C++ standardfrom fcn inBase teach the most current programming // D1 inherits definition ofBase::fcn() 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 class D2 : public D1 in learned Authoritative and comprehensive{ its coverageThe source code for the book's extended examples is available on public: the Web at the address below Print ISBN: 0-201-72148-1
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int fcn(int); // nonvirtual function hides D1::fcn(int) int fcn(); // redefines virtual fcn from Base };
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The version of fcn in D1 does not redefine the virtual fcn from Base Instead, it hides fcn from the base Effectively, D1 has two functions named fcn : The class inherits a virtual named fcn from the Base and defines its own, nonvirtual member named fcn that takes an int parameter However, the virtual from the Base cannot be called from a D1 object (or reference or pointer to D1) because that function is hidden by the definition of fcn(int) The class D2 redefines both functions that it inherits It redefines the virtual version of fcn originally defined in Base and the nonvirtual defined in D1
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