A Separate Using Declaration Is Required for Each Name in Visual Studio .NET

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Ausing declaration introduces only one namespace member at a time It allows us to be very specific regarding which names are used in our programs If we want to use several names fromstd or any other namespacethen we must issue a using declaration for each name that we intend to use For example, we could rewrite the addition program from page 6 as follows:
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#include <iostream> // using declarations for names from the standard library
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using std::cin; using std::cout; using std::endl; C++ int main() Primer, Fourth Edition By Stanley B Lippman,Jos e Lajoie, { cout Barbara E Moo two numbers:" << endl; << "Enter int v1, v2; Publisher:Addison cin >> v1 >> v2; Wesley cout Professional << "The sum of " << v1 Pub Date: Februaryv2 2005 << " and " << 14, Print " is " << v1 + v2 << endl; << ISBN: 0-201-72148-1 Pages: return 0; 912 Table of } Contents | Index
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Theusing declarations for cin, cout, and endl mean that we can use those names without programmers learn the language faster and use it in a more modern, effective wayJust as C++ has evolved since the last thestd:: prefix, making the code easier to read
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This popular tutorial introduction to standard C++ has been completely updated, reorganized, and rewritten to help
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readers the point on, our examples will assume that using declarations have been today's best From this means to write useful programs without first having to master every language detail Highlightingprovided for practices, they show how to write programs that library Thus, we will refer offer outstanding performance the names we use from the standardare safe, can be built quickly, and yet to cin , not std::cin , in the Examples in take advantage of the library, and explain the features of C++, also we how to show the using text and thatcode examples To keep the code examples short, showwon't make the best use of the language As in that are editions, to compile the examples Similarly, C++ concepts and techniques not declarations its previousneededthe book's authoritative discussion of fundamentalour code examples will makes it a valuable resource even for more experienced programmersProgram Faster and More Effectively with This library show the necessary #include directives Table A1 (p 810) in Appendix A lists the Rewritten Classic and corresponding headers for C++ standard library names we use most current programming namesRestructured for quicker learning, using thestandard-library Updated to teach thein this primer 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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Readers should be aware that they must add appropriate #include and using declarations to our examples before compiling them
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Class Definitions that Use Standard Library Types
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There is one case in which we should always use the fully qualified library names: inside header files The reason is that the contents of a header are copied into our program text by the preprocessor When we #include a file, it is as if the exact text of the header is part of our file If we place a using declaration within a header, it is equivalent to placing the same using declaration in every program that includes the header whether that program wants the using declaration or not
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In general, it is good practice for headers to define only what is strictly necessary
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C++ Primer, Fourth Edition By Stanley B Lippman,Jos e Lajoie, Barbara E Moo Publisher:Addison Wesley Professional Pub Date: February 14, 2005 Print ISBN: 0-201-72148-1 Pages: 912 Exercise Rewrite the program from Section 23 (p 43) that calculated
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