Operations on istream_iterators in VS .NET

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Operations on istream_iterators
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Constructing an istream_iterator bound to a stream positions the iterator so that the first dereference reads the first value from the stream
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Table 112 istream_iterator Operations
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it1 == it2 it1 != it2
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Equality (inequality) between two istream_iterators The iterators must read the same type Two iterators are equal if they are C++ Primer, Fourth Edition both the end value Two non-end-ofstream iterators are equal if they are constructed using By Stanley B Lippman,Jos e Lajoie, the same input stream
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Barbara E Moo from the stream Returns the value read Publisher:Addison Wesley Professional Synonym for (*it)mem Returns member, mem , of the Pub Date: February from the stream object read 14, 2005 Print ISBN: 0-201-72148-1 Pages:Advances the iterator by reading the next value from the 912
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*it it->mem
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++it it++
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Table of Contents | Index
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input stream using the operator for the element type As usual, the prefix version advances the stream and returns a reference to the incremented iterator The postfix version advances the stream but returns the old This popular tutorial introduction to standard C++ has been completely updated, reorganized, and rewritten to help value
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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 means to write useful programs without first having to master every language detail Highlighting today's best As an example, we could use an istream_iterator to read the standard input into a vector: 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 istream_iterator<int> in_iter(cin); // read ints from cin it a valuable resource even for more experienced programmersProgram Faster and More Effectively with This Rewritten istream_iterator<int> eof; // istream "end" iterator Classic Restructured for quicker learning, using the C++ standard library Updated to teach the most current programming // read until end of file, storing what was read in vec styles and program design techniques Filled with new learning aids that emphasize important points, warn about common while (in_iter != eof) pitfalls, suggest good programming practices, and provide general usage tips Complete with exercises that reinforce skills // increment advances the stream to the next value learned Authoritative and comprehensive in its coverageThe source code for the book's extended examples is available on // dereference reads next value from the istream the Web at the address below
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vecpush_back(*in_iter++);
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This loop reads int s from cin , and stores what was read in vec On each trip the loop checks whetherin_iter is the same as eof That iterator was defined as the empty istream_iterator, which is used as the end iterator An iterator bound to a stream is equal to the end iterator once its associated stream hits end-of-file or encounters another error The hardest part of this program is the argument to push_back, which uses the dereference and postfix increment operators Precedence rules (Section 55, p 163) say that the result of the increment is the operand to the dereference Incrementing an istream_iterator advances the stream However, the expression uses the postfix increment, which yields the old value of the iterator The effect of the increment is to read the next value from the stream but return an iterator that refers to the previous value read We dereference that iterator to obtain that value What is more interesting is that we could rewrite this program as:
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istream_iterator<int> in_iter(cin); // read intsfrom cin istream_iterator<int> eof; // istream "end" iterator vector<int> vec(in_iter, eof); // constructvec from an iterator range
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Here we construct vec from a pair of iterators that denote a range of elements Those iterators areistream_iterators, which means that the range is obtained by reading the associated stream The effect of this constructor is to read cin until it hits end-of-file or encounters an input that is not an int The elements that are read are used to construct vec
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