Key Concept: Assigning TO or THROUGH a Pointer in .NET framework

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Comparing Pointers and References
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While both references and pointers are used to indirectly access another value, there are two important differences between references and pointers The first is that a reference always refers to an object: It is an error to define a reference without initializing it The behavior of assignment is the second important difference: Assigning to a reference changes the object to which the reference is bound; it does not rebind the reference to another object Once initialized, a reference always refers to the same underlying object Consider these two program fragments In the first, we assign one pointer to another:
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int ival = 1024, ival2 = 2048; int *pi = &ival, *pi2 = &ival2; pi = pi2; // pi now points toival2
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After the assignment, ival, the object addressed by pi remains unchanged The assignment C++ Primer, Fourth Edition changes the value of pi, making it point to a different object Now consider a similar program By Stanley B Lippman,Jos e Lajoie, that assigns two references:
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Barbara E Moo int Publisher:Addison Wesleyival2; &ri = ival, &ri2 = Professional ri = ri2; // assignsival2 toival Pub Date: February 14, 2005 Print ISBN: 0-201-72148-1 Pages: 912
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Table of Contents | Index This assignment changes
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ival, the value referenced by ri, and not the reference itself After the assignment, the two references still refer to their original objects, and the value of those objects is now the same as well
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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 Pointers to Pointers 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, are themselves objects that are safe, They, therefore, yet offer outstanding that we can Pointers they show how to write programsin memorycan be built quickly, andhave addresses performance Examples that take advantage of the library, and explain the features of C++, also show how to make the best use of the store in a pointer: 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 learning, using the C++ standard library Updated to teach the most current programming int ival = 1024; styles and program design techniques Filled with new learning aids that emphasize important points, warn about common int *pi = &ival; // pi points to an int pitfalls, suggest good **ppi = π // and provide to a pointer to tips Complete with exercises that reinforce skills int programming practices, ppi points general usage int 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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which yields a pointer to a pointer We designate a pointer to a pointer by using ** We might represent these objects as
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As usual, dereferencing ppi yields the object to which ppi points In this case, that object is a pointer to an int :
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int *pi2 = *ppi; // ppi points to a pointer
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To actually access ival, we need to dereference ppi twice:
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cout << << << << <<
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"The value of ival\n" "direct value: " << ival << "\n" "indirect value: " << *pi << "\n" "doubly indirect value: " << **ppi endl;
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This program prints the value of ival three different ways First, by direct reference to the variable Then, through the pointer to int in pi, and finally, by dereferencing ppi twice to get to the underlying value in ival
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C++ Primer, Exercises Section Fourth Edition 423 By Stanley B Lippman,Jos e Lajoie, Barbara E Moo Publisher:Addison Wesley Exercise Write code to change the value of a pointer Write code to Professional 414: Date: February 14, 2005 Pub change the value to which the pointer points Print ISBN: 0-201-72148-1 Exercise Explain the key differences between pointers and references Pages: 912
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