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Table of Contents | Index
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int main() { int i = 10; This popular tutorialj = 20; to standard C++ has been completely updated, reorganized, and rewritten to help int introduction programmers coutthe language faster swap():\ti: " modern, effective wayJust as C++ has evolved since the last learn << "Before and use it in a more edition, so has the authors' approach to teaching it They now introduce the C++ standard library from the beginning, giving << i << "\tj: " << j << endl; readers the means to write useful programs without first having to master every language detail Highlighting today's best swap(i, j); practices, they show how to write programs that are safe," cout << "After swap():\ti: can be built quickly, and yet offer outstanding performance Examples that take advantage of the library," << j << endl; of C++, also show how to make the best use of the << i << "\tj: and explain the features language As return 0; 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 }
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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 Compiling and executing this program results in the following output: the Web at the address below
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Before swap(): i: 10 j: 20 After swap(): i: 10 j: 20
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For swap to work as intended and swap the values of its arguments, we need to make the parameters references:
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// ok: swapacts on references to its arguments void swap(int &v1, int &v2) { int tmp = v2; v2 = v1; v1 = tmp; }
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Like all references, reference parameters refer directly to the objects to which they are bound rather than to copies of those objects When we define a reference, we must initialize it with the object to which the reference will be bound Reference parameters work exactly the same way Each time the function is called, the reference parameter is created and bound to its corresponding argument Now, when we call swap
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swap(i, j);
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the parameter v1 is just another name for the object i and v2 is another name for j Any change to v1 is actually a change to the argument i Similarly, changes to v2 are actually made to j If we recompile main using this revised version of swap, we can see that the output is now correct: C++ Primer, Fourth Edition
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By Stanley B Lippman,Jos e Lajoie, Barbara E Moo Before swap(): i: 10 j: 20 After swap(): i: 20 j: 10 Publisher:Addison Wesley Professional Pub Date: February 14, 2005 Print ISBN: 0-201-72148-1 Pages: 912
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Table of Contents | Index
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Programmers who come to C++ from a C background are used to passing pointers to obtain access to the argument In This popular tutorial introductionit is safer C++ has beennatural to use reference and rewritten to help C++ to standard and more completely updated, reorganized, programmers learn the language faster and use it in a more modern, effective wayJust as C++ has evolved since the last parameters
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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 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 Reference Parameters to Return Additional Information UsingRestructured 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, seen good programming practices, and provide general parameters were exercises that reinforce skills We've suggestone example, swap, in which referenceusage tips Complete withused to allow the function learned Authoritative and of its arguments Another use code for the book's extended examples is available to change the value comprehensive in its coverageThe sourceof reference parameters is to return anon the Web at result to the additionalthe address belowcalling function
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Functions can return only a single value, but sometimes a function has more than one thing to return For example, let's define a function named find_val that searches for a particular value in the elements of a vector of integers It returns an iterator that refers to the element, if the element was found, or to the end value if the element isn't found We'd also like the function to return an occurrence count if the value occurs more than once In this case the iterator returned should be to the first element that has the value for which we're looking How can we define a function that returns both an iterator and an occurrence count We could define a new type that contains an iterator and a count An easier solution is to pass an additional reference argument that find_val can use to return a count of the number of occurrences:
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// returns an iterator that refers to the first occurrence of value // the reference parameter occurs contains a second return value vector<int>::const_iterator find_val( vector<int>::const_iterator beg, vector<int>::const_iterator end, int value, vector<int>::size_type &occurs) { // res_iter will hold first occurrence, if any vector<int>::const_iterator res_iter = end; occurs = 0; // set occurrence count parameter for ( ; beg != end; ++beg) if (*beg == value) { // remember first occurrence ofvalue if (res_iter == end) res_iter = beg; ++occurs; // increment occurrence count
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