Local Classes May Not Use Variables from the Function's Scope in .NET framework

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Local Classes May Not Use Variables from the Function's Scope
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The names from the enclosing scope that a local class can access are limited A local class can access only type names, static variables (Section 752, p 255), and enumerators defined within the enclosing local scopes A local class may not use the ordinary local variables of the function in which the class is defined:
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int a, val; void foo(int val) { static int si; enum Loc { a = 1024, b }; // Bar is local tofoo class Bar { public: Loc locVal; // ok: uses local type name int barVal; void fooBar(Loc l = a) // ok: default argument is Loc::a { barVal = val; // error: val is local tofoo barVal = ::val; // ok: uses global object barVal = si; // ok: uses static local object locVal = b; // ok: uses enumerator } }; //
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C++ Primer, Fourth Edition
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Normal ProtectionMoo Barbara E Rules Apply to Local Classes
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Publisher:Addison Wesley The enclosing function has no special access privileges to the private members of the local class Of course,Professional the local class could make the enclosing function a friend Pub Date: February 14, 2005 Print ISBN: 0-201-72148-1 Pages: 912
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Table of Contents | Index
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By Stanley B Lippman,Jos e Lajoie,
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In practice, private members are hardly ever necessary in a local class Often all members of a local class are This popular tutorial introduction to standard C++ has been completely updated, reorganized, and rewritten to help public
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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 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 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 that can access a local class Updated limited most current programming The portion of a programlearning, using the C++ standard libraryis very to teach theA local class is styles and program design techniques Filled with new learning aids that emphasize important points, warn about common encapsulated within its local scope Further encapsulation through information hiding is often pitfalls, suggest good programming practices, and provide general usage tips Complete with exercises that reinforce skills overkill 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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Name Lookup within a Local Class
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Name lookup within the body of a local class happens in the same manner as for other classes Names used in the declarations of the members of the class must be in scope before the use of the name Names used in definitions of the members can appear anywhere in the scope of the local class Names not resolved to class members are searched first in the enclosing local scope and then out to the scope enclosing the function itself
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Nested Local Classes
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It is possible to nest a class inside a local class In this case, the nested class definition can appear outside the local-class body However, the nested class must be defined in the same local scope as that in which the local class is defined As usual, the name of the nested class must be qualified by the name of the enclosing class and a declaration of the nested class must appear in the definition of the local class:
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void foo() { class Bar { public: // class Nested; }; // definition ofNested class Bar::Nested { // }; }
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