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We can initialize a vector from a count and an element value The constructor uses the count to determine how many elements the vector should have and uses the value to specify the value each of those elements will have:
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vector<int> ivec4(10, -1); vector<string> svec(10, "hi!");
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// 10 elements, each initialized to -1 // 10 strings, each initialized to "hi!"
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C++ vectorS Grow Key Concept: Primer, Fourth Edition Dynamically By Stanley B Lippman,Jos e Lajoie, Barbara E Moo A central property of vectors (and the other library containers) is that they are required to be implemented so that it is efficient to add elements Publisher:Addison Wesley to them at run time Because vectors grow efficiently, it is usually best to Professional let the vector grow by February elements to it dynamically as the element Pub Date: adding 14, 2005 values are known Print ISBN: 0-201-72148-1 Pages: 912
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Table of Contents | Index
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As we'll see in 4, this behavior is distinctly different from that of built-in arrays in C and for that matter in most other languages In particular, readers accustomed to using C or Java might expect that becausevector elements are stored contiguously, it would be best to preallocate the vector at its expected size In fact, the contrary is the This popular tutorial introduction to standard C++ has been completely updated, reorganized, and rewritten to help case, for reasons we'll explore in 9 programmers learn the language faster and use it in a more modern, effective wayJust as C++ has evolved since the last
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edition, so has the authors' approach to teaching it They now introduce the C++ standard library from the beginning, giving Although we can preallocate a given number of elements readers the means to write useful programs without first having to master every language detail Highlighting today's best in a vector write programs that are safe, can be built to define an empty practices, they show how to , it is usually more efficient quickly, and yet offer outstanding performance vector and add elements to it (as we'll C++, also show how to Examples that take advantage of the library, and explain the features oflearn how to do make the best use of the language Asshortly) editions, the book's authoritative discussion of fundamental C++ concepts and techniques makes in its previous 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 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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Value Initialization
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When we do not specify an element initializer, then the library creates a value initialized element initializer for us This library-generated value is used to initialize each element in the container The value of the element initializer depends on the type of the elements stored in thevector If the vector holds elements of a built-in type, such as int , then the library creates an element initializer with a value of 0:
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vector<string> fvec(10); // 10 elements, each initialized to 0
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If the vector holds elements of a class type, such as string, that defines its own constructors, then the library uses the value type's default constructor to create the element initializer:
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vector<string> svec(10); // 10 elements, each an empty string
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As we'll see in 12, some classes that define their own constructors do not define a default constructor We cannot initialize a vector of such a type by specifying only a size; we must also specify an initial element value
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There is a third possibility: The element type might be of a class type that does not define any constructors In By Stanley B Lippman,Jos estill creates a value-initialized object It does so by this case, the library Lajoie, Barbara E Moo value-initializing each member of that object
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Publisher:Addison Wesley Professional Pub Date: February 14, 2005 Print ISBN: 0-201-72148-1 Pages: 912
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