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Exercises Section 1032
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Table of Contents | Index
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Exercise
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What are the mapped_type, key_type, and value_type of a
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107: map to standard to vector<int> This popular tutorial introductionfrom int 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 Exercise Write anto teaching it They now introduce the C++ standard library value to has the authors' approach expression using a map iterator to assign a from the beginning, giving 108: readers the means to writean element without first having to master every language detail Highlighting today's best useful programs 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 map 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 step is to populate it for the book's extended examples available on Once the map is defined, the next its coverageThe source codewith the keyvalue elementispairs We the do at either by using canWeb sothe address below the insert member or by fetching an element using the subscript
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1033 Adding Elements to a
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operator and then assigning a value to the element returned In both cases, the fact that there can be only a single element for a given key affects the behavior of these operations
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1034 Subscripting a map
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When we write
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map <string, int> word_count; // empty map // insert default initialzed element with key Anna; then assign 1 to its value word_count["Anna"] = 1;
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the following steps take place: 1 word_count is searched for the element whose key is Anna The element is not found 2 A new keyvalue pair is inserted into word_count The key is a const string holding Anna The value is value initialized, meaning in this case that the value is 0 3 The new keyvalue pair is inserted into word_count 4 The newly inserted element is fetched and is given the value 1
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Subscripting a map behaves quite differently from subscripting an array or vector: Using an index that is not already present adds anC++ Primer, with that index to the map element Fourth Edition
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By Stanley B Lippman,Jos e Lajoie, Barbara E Moo Publisher:Addison Wesley Professional Pub Date: February 14, 2005 As with other subscript operators, the map subscript takes an index (that is, a key) and fetches Print ISBN: 0-201-72148-1 the value associated with that key When we look for a key that is already in the map , then the Pages: 912
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Table of Contents | Index
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behavior is the same for a map subscript or a vector subscript: The value associated with the key is returned For map s only, if the key is not already present, a new element is created and inserted into the map for that key The associated value is value-initialized: An element of class type is initialized using the default constructor for the element type; a built-in type is This popular tutorial initialized to 0 introduction to standard C++ has been completely updated, reorganized, and rewritten to help
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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 Value Returned from a first having to Operation Using the means to write useful programs withoutSubscript 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 As usual, the subscript operator returns an lvalue The lvalue it returns is the value associated language As in its previous editions, the book's authoritative discussion of fundamental C++ concepts and techniques makes with the key We can read or write the element: 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 cout << word_count["Anna"]; // fetch element indexed byAnna; prints 1 pitfalls, suggest good programming practices, and provide general usage tips Complete with exercises that reinforce skills ++word_count["Anna"]; // fetch the element and add one to it learned Authoritative and comprehensive in its coverageThe source code for the book's extended examples is available on cout << word_count["Anna"]; // fetch the element and print it; prints 2 the Web at the address below
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Unlikevector or string, the type returned by map subscript operator differs from the type obtained by dereferencing a map iterator
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As we've seen, a map iterator returns a value_type, which is a pair that contains a const key_type and mapped_type; the subscript operator returns a value of type mapped_type
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