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ptr1set_int(0); // changesval member only inptr1 ptr2get_int(); // returns 42
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ptr1get_int();
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// returns 0
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C++ Primer, Fourth Edition
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When we copy aBy Stanley Bthe address values are distinct, but the pointers point to the same pointer, Lippman,Jos e Lajoie, Barbara E Moo underlying object If we call set_ptr_val on either object, the underlying object is changed for both:
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Publisher:Addison Wesley Professional Pub Date: February 14, 2005 ptr1set_ptr_val(42); // sets object to which both ptr1and ptr2point Print ISBN: 0-201-72148-1 ptr2get_ptr_val(); // returns 42 Pages: 912
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Table of Contents | Index
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When two pointers point to the same object, either one can change the value of the shared object
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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 our class copies the pointers directly, it presents also users with a potential problem: Because that take advantage of thelibrary, and explain the features of C++, our show how to make the best use of the language As in its previous editions, the given It is up to the user to guarantee that and object to which HasPtr stores the pointer it wasbook's authoritative discussion of fundamental C++ concepts the techniques makes it a valuable resource even for more experienced programmersProgram Faster and More that pointer points stays around as long as the HasPtr object does: Effectively with This Rewritten 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 pitfalls,int *ip = programming practices, and provide general usageint initializedwith exercises that reinforce skills suggest good new int(42); // dynamically allocated tips Complete to 42 learned Authoritative and comprehensive in //coverageThepoints to same object as ip does its Has Ptr source code for the book's extended examples is available on HasPtr ptr(ip, 10); the Web at the address below delete ip; // object pointed to byip is freed
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ptrset_ptr_val(0); // disaster: The object to which Has Ptr points was freed!
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The problem here is that ip and the pointer inside ptr both point to the same object When that object is deleted, the pointer inside HasPtr no longer points to a valid object However, there is no way to know that the object is gone
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Exercises Section 135
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Exercise Given the original version of the HasPtr class that relies on the C++ default definitions 1320: Primer, Fourth Edition for copy-control, describe what happens in By Stanley B Lippman,Jos e Lajoie, the following code:
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Barbara E Moo int i = 42; Publisher:Addison Wesley HasPtr p1(&i, 42); Professional HasPtr p2 = p1; Pub Date: February 14, 2005 cout << p2get_ptr_val() << endl; Print ISBN: 0-201-72148-1 Pages: 912 p1set_ptr_val(0);
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Table of Contents | Index
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cout << p2get_ptr_val() << endl;
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This popular tutorial introduction towould happen been completely updated, reorganized, and rewritten to help Exercise What standard C++ has if we gave our HasPtr class a destructor programmers 1321: language faster andits pointer member learn the thatdeleted 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 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 In the suggest good programming defined and provide class that heldComplete withand an int reinforce skills previous section we practices, a simple general usage tips a pointer exercises that The pointer pitfalls, member behaved incomprehensive in any other pointercode for the book'smade toexamples is available on all ways like its coverageThe source Any changes extended the object to which learned Authoritative and the Web at thepointed were made to a single, shared object If the user deleted that object, then pointer address below the
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