return i; // returnsB::i in Visual Studio .NET

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return i; // returnsB::i
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} } // namespace Bis closed and names in it are no longer visible int f2() { return j; // error: jis not defined } int j = i; // initialized fromA::i }
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Names used in a class member definition are resolved in much the same way, with one important difference: If the name is not local to the member function, we first try to resolve the name to a class member before looking in the outer scopes As we saw in Section 123 (p 444), members defined inside a class may use names that appear textually after the definition For example, a constructor defined inside the class body may initialize the data members even if the declaration of those members appears after the constructor definition When a name is used in a class scope, we look first in the member itself, then in the class, including any base classes Only after exhausting the class(es) do we examine the enclosing scopes When a class is wrapped in a namespace, the same lookup happens: Look first in the member, then the class (including base classes), then look in the enclosing scopes, one or more of which might be a namespace:
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namespace A { int i; int k; class C1 { public: C1(): i(0), j(0) { } int f1()
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// ok: initializes C1::i and C1::j
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{ return k; // returnsA::k } C++ Primer, int f2() Fourth Edition { By Stanley B Lippman,Jos e Lajoie, Barbara E Moo return h; // error: his not defined } Publisher:Addison Wesley int f3(); Professional private: Pub int i;Date: February 14, 2005 hides A::iwithin C1 // Print int j; ISBN: 0-201-72148-1 Pages: 912 }; Table of Contents | h = i; int Index // initialized fromA::i } // memberf3 is defined outside class C1 and outside namespace A int tutorial introduction to standard C++ has been completely updated, reorganized, and rewritten to help A::C1::f3() This popular { programmers learn the language faster and use it in a more modern, effective wayJust as C++ has evolved since the last return h; // now introduce the edition, so has the authors' approach to teaching it Theyok: returns A::h 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
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practices, they show how to write programs that are safe, can 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 With the exception offor more experienced programmersProgram Faster and More Effectively with Thisname must it a valuable resource even member definitions, scopes are always searched upward: A Rewritten be declared before quicker learning, using the C++the return in f2 willtonot compilecurrent programming Classic Restructured for it can be used Hence, standard library Updated teach the most It attempts to reference the name htechniques Filled with new,learning aids that emphasize important points, warn about common styles and program design from namespace A but h has not yet been defined Had that name been defined in A before the definition ofand,provide generalh would be legal Similarly, that reinforce skills pitfalls, suggest good programming practices, C1 the use of usage tips Complete with exercises the use of h insidef3 is okay, and comprehensivedefined after A::h has been defined learned Authoritative because f3 is in its coverageThe source code for the book's extended examples is available on the Web at the address below
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The order in which scopes are examined to find a name can be inferred from the qualified name of a function The qualified name indicates, in reverse order, the scopes that are searched
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The qualifiers A::C1::f3 indicate the reverse order in which the class scopes and namespace scopes are to be searched The first scope searched is that of the function f3 Then the class scope of its enclosing class C1 is searched The scope of the namespace A is searched last before the scope containing the definition of f3 is examined
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