Programming Implications of the Subscript Behavior in .NET

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Programming Implications of the Subscript Behavior
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The fact that subscript adds an element if it is not already in the map allows us to write surprisingly succinct programs:
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// count number of times each word occurs in the input map<string, int> word_count; // empty map from string to int string word; while (cin >> word) ++word_count[word];
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This program creates a map that keeps track of how many times each word occurs The while loop reads the standard input one word at a time Each time it reads a new word, it uses that word to index word_count Fourth Edition C++ Primer, If word is already in the map , then its value is incremented The interesting part is what happens when a word is encountered for the first time: A new Barbara E Moo element indexed by word, with an initial value of zero, is created and inserted into word_count The value of that element is immediately incremented so that each time we insert a new word Publisher:Addison Wesley into the map it starts off with an occurrence count of one
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Professional Pub Date: February 14, 2005 Print ISBN: 0-201-72148-1 Pages: 912 By Stanley B Lippman,Jos e Lajoie,
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Table of Contents | Index
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Exercises Section 1034
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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 Exercise Write a program it They now and print the numberlibrary from the beginning, giving has the authors' approach to teaching to count introduce the C++ standard of times readers the means to writeeach word occurs in the input useful programs without first having to master every language detail Highlighting today's best 109: 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 theprogram C++, also show how to make the best use of the Exercise What does the following features of do language As 1010: 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 map<int, int> m; Classic Restructured for quicker learning, using the C++ standard library Updated to teach the most current programming m[0] = 1; 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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Contrast the behavior of the previous program with this one:
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vector<int> v; v[0] = 1;
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Exercise 1011:
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What type can be used to subscript a map What type does the sub-script operator return Give a concrete examplethat is, define a map and then write the types that could be used to subscript the map and the type that would be returned from the subscript operator
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1035 Using map::insert
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Theinsert members operate similarly to the operations on sequential containers (Section 933, p 318), with one important caveat: We must account for the effect of the key The key impacts the argument types: The versions that insert a single element take a value that is a keyvaluepair Similarly, for the version that takes an iterator pair, the iterators must refer to elements that are keyvalue pairs The other difference is the return type from the version of insert that takes a single value, which we will cover in the remainder of this section
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