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// false, all bits are zero // true, all bits are zero
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If we need to know how many bits are set, we can use the count operation, which returns the number of bits that are set:
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size_t bits_set = bitveccount(); // returns number of bits that are on
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The return type of the count operation is a library type named size_t The size_t type is defined in the cstddef header, which is the C++ version of the stddefh header from the C library It is a machine-specific unsigned type that is guaranteed to be large enough to hold the size of an object in memory Thesize operation, like the one in vector and string, returns the total number of bits in the bitset The value returned has type size_t:
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size_t sz = bitvecsize(); // returns32
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Accessing theC++ Primer,aFourth Edition Bits in bitset
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By Stanley B Lippman,Jos e Lajoie,
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The subscript operator E Moo read or write the bit at the indexed position As such, we can Barbara lets us use it to test the that value: value of a given bit or to set
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Publisher:Addison Wesley Professional // assign 1 Pub Date: February 14, 2005 to even numbered bits for (int Print ISBN: 0; index != 32; index += 2) index = 0-201-72148-1 bitvec[index] = 1; Pages: 912
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Table of Contents | Index
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This loop turns on the even-numbered bits of bitvec
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This popular tutorial introduction to standard C++ has been completely updated, reorganized, and rewritten to help programmers subscript operator, we can a more modern, test, wayJust as C++ has evolved since the last As with thelearn the language faster and use it inuse the set, effective and reset operations to test or set edition, so has the authors' approach to teaching it They now introduce the C++ standard library from the beginning, giving a given bit value: 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 // equivalent loop using set operation Examples that take advantage of the library, and explain the features of C++, also show how to make the best use of the for (int index = 0;the book's authoritative discussion of2) language As in its previous editions, index != 32; index += fundamental C++ concepts and techniques makes bitvecset(index); it a valuable resource even for more experienced programmersProgram Faster and More Effectively with This Rewritten 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 To testAuthoritative a bit is on, we can use the test operation the book's the value returned from on learned whether and comprehensive in its coverageThe source code for or test extended examples is available the subscript the address below the Web at operator:
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if (bitvectest(i)) // bitvec[i] is on // equivalent test using subscript if (bitvec[i]) // bitvec[i] is on
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The result of testing the value returned from a subscript is true if the bit is 1 or false if the bit is 0
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Setting the Entire bitset
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Theset and reset operations can also be used to turn on or turn off the entire bitset object, respectively:
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bitvecreset(); // set all the bits to 0 bitvecset(); // set all the bits to 1
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Theflip operation reverses the value of an individual bit or the entire bitset:
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bitvecflip(0); // reverses value of first bit bitvec[0]flip(); // also reverses the first bit bitvecflip(); // reverses value of all bits
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By Stanley B Lippman,Jos e Lajoie, Barbara returns an unsigned long that holds the same bit pattern as the Theto_ulong operation E Moo bitset object We can use this operation only if the size of the bitset is less than or equal to Publisher:Addison Wesley the size of an unsigned long : Professional Pub Date: February 14, 2005 unsigned Print ISBN: 0-201-72148-1 long ulong = bitvec3to_ulong(); cout << "ulong = " << ulong << endl; Pages: 912