of Contents | Index in Visual Studio .NET

Encoder DataMatrix in Visual Studio .NET of Contents | Index
Table of Contents | Index
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Returning a Reference
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This popular tutorial introduction to standard C++ has been completely updated, reorganized, and rewritten to help
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When a function returns afaster and use it in a more modern, effective wayJust copied Instead, thethe last programmers learn the language reference type, the return value is not as C++ has evolved since object itself is returned As an example, consider a function that returns a library from the beginning, giving of edition, so has the authors' approach to teaching it They now introduce the C++ standard reference to the shorter its two the meansparameters: readers string 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 // find longer of twostrings language As in its previous editions, the book's authoritative discussion of fundamental C++ concepts and techniques makes const string for more experienced programmersProgram &s1, and More Effectively with This Rewritten it a valuable resource even &shorterString(const string Faster const string &s2) Classic{ Restructured for quicker learning, using the C++ standard library Updated to teach the most current programming return s1size() < with new learning s1 : emphasize important points, warn about common styles and program design techniques Filleds2size() aids thats2; } 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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The parameters and return type are references to const string The strings are not copied either when calling the function or when returning the result
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Never Return a Reference to a Local Object
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There's one crucially important thing to understand about returning a reference: Never return a reference to a local variable
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When a function completes, the storage in which the local objects were allocated is freed A reference to a local object refers to undefined memory after the function terminates Consider the following function:
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// Disaster: Function returns a reference to a local object const string &manip(const string& s) { string ret = s;
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// transform ret in some way return ret; // Wrong: Returning reference to a local object! }
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C++ Primer, Fourth Edition By Stanley B Lippman,Jos e Lajoie, Barbara E Moo This function will fail at run time because it returns a reference to a local object When the Publisher:Addison Wesley function ends, the storage in which ret resides is freed The return value refers to memory that is no longerProfessional the program available to 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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One good way to ensure that the return is safe is to ask: To whatpre-existing object is the reference referring
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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 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 Are experienced Reference Returnsfor moreLvalues 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 A function that design techniques Filled with new learning aids thatThat function, therefore, can be used returns a reference returns an lvalue emphasize important points, warn about common pitfalls, suggest good programming practices, and provide general usage tips Complete with exercises that reinforce skills wherever an lvalue is required: 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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char &get_val(string &str, string::size_type ix) { return str[ix]; } int main() { string s("a value"); cout << s << endl; // printsa value get_val(s, 0) = 'A'; // changess[0]toA cout << s << endl; return 0; } // printsA value
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It may be surprising to assign to the return of a function, but the return is a reference As such, it is just a synonym for the element returned If we do not want the reference return to be modifiable, the return value should be declared asconst:
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const char &get_val(
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