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C++ Primer, Fourth Edition
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511 The ByStanleyand delete Expressions new B Lippman,Jos e Lajoie, Barbara E Moo
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Publisher: we saw how to InSection 431 (p 134) Addison Wesley use new and delete expressions to dynamically Professional allocate and free arrays We can also use new and delete to dynamically allocate and free single objects Pub Date: February 14, 2005 Print ISBN: 0-201-72148-1
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When we define Pages: 912 we specify a type and a name When we dynamically allocate an a variable, object, we specify a type but do not name the object Instead, the new expression returns a Table of Contents | Index pointer to the newly allocated object; we use that pointer to access the object:
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This popular tutorial introduction to standardnamed, uninitialized int variable reorganized, and rewritten to help int i; // C++ has been completely updated, programmers *pi the new int; // pi points more modern, effective wayJust as C++ has evolved since the last int learn = language faster and use it in a to dynamically allocated, edition, so has the authors' approach to// unnamed, uninitialized int C++ standard library from the beginning, giving teaching it They now introduce the 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, one object of type int from the free C++ concepts and techniques Thisnew expression allocates the book's authoritative discussion of fundamental store and returns the makes it a valuable that object more experienced programmersProgram the and More Effectively with This Rewritten address ofresource even for We use that address to initializeFaster pointer pi 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, 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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Initializing Dynamically Allocated Objects
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Dynamically allocated objects may be initialized, in much the same way as we initialize variables:
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int i(1024); // value of iis 1024 int *pi = new int(1024); // object to which pi points is 1024 string s(10, '9'); // value of sis "9999999999" string *ps = new string(10, '9'); // *ps is "9999999999"
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We must use the direct-initialization syntax (Section 233, p 48) to initialize dynamically allocated objects When an initializer is present, the new expression allocates the required memory and initializes that memory using the given initializer(s) In the case of pi, the newly allocated object is initialized to 1024 The object pointed to by ps is initialized to a string of 10 nines
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Default Initialization of Dynamically Allocated Objects
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If we do not explicitly state an initializer, then a dynamically allocated object is initialized in the same way as is a variable that is defined inside a function (Section 234, p 50) If the object is of class type, it is initialized using the default constructor for the type; if it is of builtin type, it is uninitialized
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string *ps = new string; // initialized to empty string int *pi = new int; // pi points to an uninitializedint
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As usual, it is undefined to use the value associated with an uninitialized object in any way other than to assign a good value to it
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C++ Primer, Fourth Edition By Stanley B Lippman,Jos e Lajoie, Barbara E Moo Just as we (almost) always initialize the objects we Publisher:Addison Wesley define as variables, it is (almost) always a good idea to Professional initialize dynamically allocated objects Pub Date: February 14, 2005 Print ISBN: 0-201-72148-1 Pages: 912
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