Bit-fields in .NET framework

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The layout in memory of a bit-field is machine-dependent
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A bit-field must be an integral data type It can be either signed or unsigned We indicate that a member is a bit-field by following the member name with a colon and a constant expression specifying the number of bits:
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typedef unsigned int Bit; class File { Bit mode: 2; Bit modified: 1; Bit prot_owner: 3; Bit prot_group: 3; Bit prot_world: 3; // };
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Themode bit-field has two bits, modified only one, and the other members each have three bits Bit-fields defined in consecutive order within the class body are, if possible, packed within adjacent bits of the same integer, thereby providing for storage compaction For
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example, in the preceding declaration, the five bit-fields will be stored in the single unsigned int first associated with the bit-field mode Whether and how the bits are packed into the integer is machine-dependent
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C++ Primer, Fourth Edition By Stanley B Lippman,Jos e Lajoie, Barbara E Moo Publisher:Addison Wesley Ordinarily it is best to make a bit-field an unsigned type The Professional behavior of bit-fields stored in a signed type is implementationPub Date: February 14, 2005 defined Print ISBN: 0-201-72148-1 Pages: 912
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Table of Contents | Index
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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 Using Bit-fields to write programs that are safe, can be built quickly, and yet offer outstanding performance practices, they show how 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 in much book's authoritative discussion of fundamental members of techniques makes A bit-field is accessed editions, the the same manner as the other dataC++ concepts and a class For it a valuable resource even for is a private programmersProgram Faster and More Effectively with This Rewritten example, a bit-field thatmore experienced member of its class can be accessed only from within the Classic Restructured member functions the C++ standard its class: definitions of thefor quicker learning, using and friends oflibrary 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 void File::write() 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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modified = 1; // } void File::close() { if (modified) // save contents }
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Bit-fields with more than one bit are usually manipulated using the built-in bitwise operators (Section 53, p 154):
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enum { READ = 01, WRITE = 02 }; // File modes int main() { File myFile; myFilemode |= READ; // set the READbit if (myFilemode & READ) // if theREADbit is on cout << "myFilemode READ is set\n"; }
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Classes that define bit-field members also usually define a set of inline member functions to test and set the value of the bit-field For example, the class File might define the members isRead and isWrite:
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inline int File::isRead() { return mode & READ; } inline int File::isWrite() { return mode & WRITE; }
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C++ Primer, Fourth Edition
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if (myFileisRead()) /*Jos e Lajoie, By Stanley B Lippman, */
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Barbara E Moo Publisher:Addison Wesley Professional With these member functions, the bit-fields can now be declared as private members of class Pub Date: February 14, 2005 File Print ISBN: 0-201-72148-1 The address-of operator (&) cannot be applied to a bit-field, so there can be no pointers Pages: 912
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