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Retrieving an Element Without Adding It
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Thefind operation returns an iterator to the element or the end iterator if the element is not present:
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int occurs = 0; map<string,int>::iterator it = word_countfind("foobar"); if (it != word_countend()) occurs = it->second;
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We should use find when we want to obtain a reference to the element with the specified key if it exists, and do not want to create the element if it does not exist
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C++ Primer, Exercises Section Fourth Edition 1036 By Stanley B Lippman,Jos e Lajoie, Barbara E Moo Publisher:Addison Wesley Exercise What is the difference between the map operations count and Professional 1014: Date: Pub find February 14, 2005 Print ISBN: 0-201-72148-1 Exercise What kinds of problems would you use count to solve When Pages: 912
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Table of Contents | Index
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1015:
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might you use find instead
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Exercise 1016:
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Define and initialize a variable to hold the result of a call to find on a map from string to vector of int
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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 map 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 three variants of experienced operation to remove elements from a with This with the There are resource even for morethe erase programmersProgram Faster and More Effectively map As Rewritten Classic Restructured for quicker learning, using a single element or a range of elements by programming sequential containers, we can erase the C++ standard library Updated to teach the most currentpassing erase styles and program design techniques These new learning aids that are similar to the corresponding an iterator or an iterator pairFilled withversions of erase emphasize important points, warn about common pitfalls, suggest good programming practices, and provide general usage tips Complete with exercises that reinforce , operations on sequential containers with one exception: The map operations return voidskills learned Authoritative and comprehensive in its coverageThe source code for the book's extended examples is available on whereas those on the sequential containers return an iterator to the element following the one the Web at the address that was removedbelow
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1037 Erasing Elements from a
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Themap type supplies an additional erase operation that takes a value of the key_type and removes the element with the given key if the element exists We could use this version to remove a specific word from word_count before printing the results:
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// erase of a key returns number of elements removed if (word_counterase(removal_word)) cout << "ok: " << removal_word << " removed\n"; else cout << "oops: " << removal_word << " not found!\n";
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Theerase function returns a count of how many elements were removed In the case of a map , that number is either zero or one If the return value is zero, then the element we wanted to erase was not in the map
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Table 107 Removing Elements from a map
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merase(k)
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Removes the element with key k from m Returns size_type indicating the number of elements C++ Primer,removed Fourth Edition
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By Stanley BRemoves element referred to by the iterator p from Lippman,Jos e Lajoie, Barbara E Moo must refer to an actual element in m; it must not m p Returns void be equal to mend() Publisher:Addison Wesley merase(b, e) Professional Removes the elements in the range denoted by the Pub Date: February pair 2005 b and e must be a valid range of iterator 14, b, e Print ISBN:elements in m:b and e must refer to elements in m or 0-201-72148-1 Pages: 912one past the last element in mb and e must either
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merase(p)
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