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Parameters that C++ Primer, Fourth Edition are plain, nonreference types are initialized by copying the corresponding argument When a parameter is initialized with a copy, the function has no access to the By Stanley B Lippman,Jos e Lajoie, actual arguments of the call It cannot change the arguments Let's look again at the Barbara E Moo definition of gcd :
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Publisher:Addison Wesley Professional // return the greatest common divisor Pub Date: February 14, 2005 int gcd(int v1, int v2) Print ISBN: 0-201-72148-1 { Pages: 912
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Table of Contents | Index
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while (v2) { int temp = v2; v2 = v1 % v2; v1 = temp; } This popular tutorial introduction to standard C++ has been completely updated, reorganized, and rewritten to help programmers return language faster and use it in a more modern, effective wayJust as C++ has evolved since the last learn the v1; } has the authors' approach to teaching it They now introduce the C++ standard library from the beginning, giving edition, so
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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 Inside the body of theeditions, , we change the values of of fundamental C++concepts and techniques makes language As in its previous while the book's authoritative discussion both v1 and v2 However, these changes are made to for more experienced programmersProgram Faster and Morethe arguments used to call it a valuable resource even the local parameters and are not reflected in Effectively with This Rewritten gcd Thus, when for quicker learning, using the C++ standard library Updated to teach the most current programming Classic Restructured we call 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 gcd(i, j) 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 values i and j are unaffected by the assignments performed inside gcd
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Nonreference parameters represent local copies of the corresponding argument Changes made to the parameter are made to the local copy Once the function terminates, these local values are gone
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A parameter can be a pointer (Section 42, p 114), in which case the argument pointer is copied As with any nonreference type parameter, changes made to the parameter are made to the local copy If the function assigns a new pointer value to the parameter, the calling pointer value is unchanged Recalling the discussion in Section 423 (p 121), the fact that the pointer is copied affects only assignments to the pointer If the function takes a pointer to a non const type, then the function can assign through the pointer and change the value of the object to which the pointer points:
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void reset(int *ip)
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{ *ip = 0; // changes the value of the object to which ip points ip = 0; // changes only the local value of ip; the argument is unchanged }
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C++ Primer, Fourth Edition By Stanley B Lippman,Jos e Lajoie, Barbara E Moo Publisher: argument is unchanged but the object to which the argument points After a call to reset, the Addison Wesley Professional will be 0: Pub Date: February 14, 2005 Print ISBN: 0-201-72148-1 Pages: int i = 42; 912
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Table of int *p | = &i; Contents Index
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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 If we want to prevent write programs that are safe, canwhich quickly, and yet points, then the parameter practices, they show how to changes to the value to be built the pointer offer outstanding performance should be defined as a pointer to const: 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 void use_ptr(const int *p) 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 // use_ptr may read but not write to*p 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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cout << "i: " << *p << '\n'; reset(p); cout << "i: " << *p << endl;
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// printsi: 42 // changes*p but not p // ok: prints i: 0
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Whether a pointer parameter points to a const or nonconst type affects the arguments that we can use to call the function We can call use_ptr on either an int* or a const int*; we can pass only on an int* to reset This distinction follows from the initialization rules for pointers (Section 425, p 126) We may initialize a pointer to const to point to a nonconst object but may not use a pointer to nonconst to point to a const object
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