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351 lines
17 KiB
351 lines
17 KiB
14 years ago
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<!-- /home/espenr/tmp/qt-3.3.8-espenr-2499/qt-x11-free-3.3.8/src/tools/qbitarray.cpp:83 -->
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
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<title>QBitArray Class</title>
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<font color="#004faf">Home</font></a>
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<font color="#004faf">All Classes</font></a>
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<td align="right" valign="center"><img src="logo32.png" align="right" width="64" height="32" border="0"></td></tr></table><h1 align=center>QBitArray Class Reference</h1>
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<p>The QBitArray class provides an array of bits.
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<a href="#details">More...</a>
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<p>All the functions in this class are <a href="threads.html#reentrant">reentrant</a> when Qt is built with thread support.</p>
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<p><tt>#include <<a href="qbitarray-h.html">qbitarray.h</a>></tt>
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<p>Inherits <a href="qbytearray.html">QByteArray</a>.
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<p><a href="qbitarray-members.html">List of all member functions.</a>
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<h2>Public Members</h2>
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<ul>
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<li class=fn><a href="#QBitArray"><b>QBitArray</b></a> ()</li>
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<li class=fn><a href="#QBitArray-2"><b>QBitArray</b></a> ( uint size )</li>
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<li class=fn><a href="#QBitArray-3"><b>QBitArray</b></a> ( const QBitArray & a )</li>
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<li class=fn>QBitArray & <a href="#operator-eq"><b>operator=</b></a> ( const QBitArray & a )</li>
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<li class=fn>uint <a href="#size"><b>size</b></a> () const</li>
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<li class=fn>bool <a href="#resize"><b>resize</b></a> ( uint size )</li>
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<li class=fn>bool <a href="#fill"><b>fill</b></a> ( bool v, int size = -1 )</li>
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<li class=fn>virtual void <a href="#detach"><b>detach</b></a> ()</li>
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<li class=fn>QBitArray <a href="#copy"><b>copy</b></a> () const</li>
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<li class=fn>bool <a href="#testBit"><b>testBit</b></a> ( uint index ) const</li>
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<li class=fn>void <a href="#setBit-2"><b>setBit</b></a> ( uint index )</li>
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<li class=fn>void <a href="#setBit"><b>setBit</b></a> ( uint index, bool value )</li>
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<li class=fn>void <a href="#clearBit"><b>clearBit</b></a> ( uint index )</li>
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<li class=fn>bool <a href="#toggleBit"><b>toggleBit</b></a> ( uint index )</li>
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<li class=fn>bool <a href="#at"><b>at</b></a> ( uint index ) const</li>
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<li class=fn>QBitVal <a href="#operator[]"><b>operator[]</b></a> ( int index )</li>
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<li class=fn>bool <a href="#operator[]-2"><b>operator[]</b></a> ( int index ) const</li>
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<li class=fn>QBitArray & <a href="#operator-and-eq"><b>operator&=</b></a> ( const QBitArray & a )</li>
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<li class=fn>QBitArray & <a href="#operator|-eq"><b>operator|=</b></a> ( const QBitArray & a )</li>
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<li class=fn>QBitArray & <a href="#operator^-eq"><b>operator^=</b></a> ( const QBitArray & a )</li>
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<li class=fn>QBitArray <a href="#operator~"><b>operator~</b></a> () const</li>
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</ul>
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<h2>Related Functions</h2>
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<ul>
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<li class=fn>QBitArray <a href="#operator-and"><b>operator&</b></a> ( const QBitArray & a1, const QBitArray & a2 )</li>
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<li class=fn>QBitArray <a href="#operator|"><b>operator|</b></a> ( const QBitArray & a1, const QBitArray & a2 )</li>
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<li class=fn>QBitArray <a href="#operator^"><b>operator^</b></a> ( const QBitArray & a1, const QBitArray & a2 )</li>
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<li class=fn>QDataStream & <a href="#operator-lt-lt"><b>operator<<</b></a> ( QDataStream & s, const QBitArray & a )</li>
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<li class=fn>QDataStream & <a href="#operator-gt-gt"><b>operator>></b></a> ( QDataStream & s, QBitArray & a )</li>
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</ul>
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<hr><a name="details"></a><h2>Detailed Description</h2>
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The QBitArray class provides an array of bits.
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<p>
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<p> Because QBitArray is a <a href="qmemarray.html">QMemArray</a>, it uses explicit <a href="shclass.html">sharing</a> with a reference count.
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<p> A QBitArray is a special byte array that can access individual
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bits and perform bit-operations (AND, OR, XOR and NOT) on entire
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arrays or bits.
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<p> Bits can be manipulated by the <a href="#setBit">setBit</a>() and <a href="#clearBit">clearBit</a>() functions,
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but it is also possible to use the indexing [] operator to test
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and set individual bits. The [] operator is a little slower than
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setBit() and clearBit() because some tricks are required to
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implement single-bit assignments.
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<p> Example:
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<pre>
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QBitArray a(3);
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a.<a href="#setBit">setBit</a>( 0 );
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a.<a href="#clearBit">clearBit</a>( 1 );
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a.<a href="#setBit">setBit</a>( 2 ); // a = [1 0 1]
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QBitArray b(3);
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b[0] = 1;
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b[1] = 1;
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b[2] = 0; // b = [1 1 0]
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QBitArray c;
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c = ~a & b; // c = [0 1 0]
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</pre>
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<p> When a QBitArray is constructed the bits are uninitialized. Use
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<a href="#fill">fill</a>() to set all the bits to 0 or 1. The array can be resized
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with <a href="#resize">resize</a>() and copied with <a href="#copy">copy</a>(). Bits can be set with
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setBit() and cleared with clearBit(). Bits can be toggled with
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<a href="#toggleBit">toggleBit</a>(). A bit's value can be obtained with <a href="#testBit">testBit</a>() and with
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<a href="#at">at</a>().
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<p> QBitArray supports the & (AND), | (OR), ^ (XOR) and ~ (NOT)
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operators.
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<p>See also <a href="collection.html">Collection Classes</a>, <a href="shared.html">Implicitly and Explicitly Shared Classes</a>, and <a href="tools.html">Non-GUI Classes</a>.
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<hr><h2>Member Function Documentation</h2>
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<h3 class=fn><a name="QBitArray"></a>QBitArray::QBitArray ()
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</h3>
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Constructs an empty bit array.
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<h3 class=fn><a name="QBitArray-2"></a>QBitArray::QBitArray ( uint size )
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</h3>
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Constructs a bit array of <em>size</em> bits. The bits are uninitialized.
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<p> <p>See also <a href="#fill">fill</a>().
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<h3 class=fn><a name="QBitArray-3"></a>QBitArray::QBitArray ( const <a href="qbitarray.html">QBitArray</a> & a )
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</h3>
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<p> Constructs a <a href="shclass.html#shallow-copy">shallow copy</a> of <em>a</em>.
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<h3 class=fn>bool <a name="at"></a>QBitArray::at ( uint index ) const
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</h3>
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<p> Returns the value (0 or 1) of the bit at position <em>index</em>.
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<p> <p>See also <a href="#operator[]">operator[]</a>().
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<h3 class=fn>void <a name="clearBit"></a>QBitArray::clearBit ( uint index )
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</h3>
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Clears the bit at position <em>index</em>, i.e. sets it to 0.
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<p> <p>See also <a href="#setBit">setBit</a>() and <a href="#toggleBit">toggleBit</a>().
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<h3 class=fn><a href="qbitarray.html">QBitArray</a> <a name="copy"></a>QBitArray::copy () const
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</h3>
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Returns a <a href="shclass.html#deep-copy">deep copy</a> of the bit array.
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<p> <p>See also <a href="#detach">detach</a>().
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<h3 class=fn>void <a name="detach"></a>QBitArray::detach ()<tt> [virtual]</tt>
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</h3>
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Detaches from shared bit array data and makes sure that this bit
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array is the only one referring to the data.
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<p> If multiple bit arrays share common data, this bit array
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dereferences the data and gets a copy of the data. Nothing happens
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if there is only a single reference.
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<p> <p>See also <a href="#copy">copy</a>().
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<p>Reimplemented from <a href="qmemarray.html#detach">QMemArray</a>.
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<h3 class=fn>bool <a name="fill"></a>QBitArray::fill ( bool v, int size = -1 )
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</h3>
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Fills the bit array with <em>v</em> (1's if <em>v</em> is TRUE, or 0's if <em>v</em>
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is FALSE).
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<p> <a href="#fill">fill</a>() resizes the bit array to <em>size</em> bits if <em>size</em> is
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nonnegative.
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<p> Returns FALSE if a nonnegative <em>size</em> was specified and the bit
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array could not be resized; otherwise returns TRUE.
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<p> <p>See also <a href="#resize">resize</a>().
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<h3 class=fn><a href="qbitarray.html">QBitArray</a> & <a name="operator-and-eq"></a>QBitArray::operator&= ( const <a href="qbitarray.html">QBitArray</a> & a )
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</h3>
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Performs the AND operation between all bits in this bit array and
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<em>a</em>. Returns a reference to this bit array.
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<p> The result has the length of the longest of the two bit arrays,
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with any missing bits (i.e. if one array is shorter than the
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other), taken to be 0.
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<pre>
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QBitArray a( 3 ), b( 2 );
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a[0] = 1; a[1] = 0; a[2] = 1; // a = [1 0 1]
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b[0] = 1; b[1] = 0; // b = [1 0]
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a &= b; // a = [1 0 0]
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</pre>
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<p> <p>See also <a href="#operator|-eq">operator|=</a>(), <a href="#operator^-eq">operator^=</a>(), and <a href="#operator~">operator~</a>().
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<h3 class=fn><a href="qbitarray.html">QBitArray</a> & <a name="operator-eq"></a>QBitArray::operator= ( const <a href="qbitarray.html">QBitArray</a> & a )
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</h3>
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<p> Assigns a <a href="shclass.html#shallow-copy">shallow copy</a> of <em>a</em> to this bit array and returns a
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reference to this array.
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<h3 class=fn><a href="qbitval.html">QBitVal</a> <a name="operator[]"></a>QBitArray::operator[] ( int index )
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</h3>
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<p> Implements the [] operator for bit arrays.
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<p> The returned <a href="qbitval.html">QBitVal</a> is a context object. It makes it possible to
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get and set a single bit value by its <em>index</em> position.
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<p> Example:
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<pre>
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QBitArray a( 3 );
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a[0] = 0;
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a[1] = 1;
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a[2] = a[0] ^ a[1];
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</pre>
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<p> The functions <a href="#testBit">testBit</a>(), <a href="#setBit">setBit</a>() and <a href="#clearBit">clearBit</a>() are faster.
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<p> <p>See also <a href="#at">at</a>().
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<h3 class=fn>bool <a name="operator[]-2"></a>QBitArray::operator[] ( int index ) const
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</h3>
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This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
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<p> Implements the [] operator for constant bit arrays.
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<h3 class=fn><a href="qbitarray.html">QBitArray</a> & <a name="operator^-eq"></a>QBitArray::operator^= ( const <a href="qbitarray.html">QBitArray</a> & a )
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</h3>
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Performs the XOR operation between all bits in this bit array and
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<em>a</em>. Returns a reference to this bit array.
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<p> The result has the length of the longest of the two bit arrays,
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with any missing bits (i.e. if one array is shorter than the
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other), taken to be 0.
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<pre>
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QBitArray a( 3 ), b( 2 );
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a[0] = 1; a[1] = 0; a[2] = 1; // a = [1 0 1]
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b[0] = 1; b[1] = 0; // b = [1 0]
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a ^= b; // a = [0 0 1]
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</pre>
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<p> <p>See also <a href="#operator-and-eq">operator&=</a>(), <a href="#operator|-eq">operator|=</a>(), and <a href="#operator~">operator~</a>().
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<h3 class=fn><a href="qbitarray.html">QBitArray</a> & <a name="operator|-eq"></a>QBitArray::operator|= ( const <a href="qbitarray.html">QBitArray</a> & a )
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</h3>
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Performs the OR operation between all bits in this bit array and
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<em>a</em>. Returns a reference to this bit array.
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<p> The result has the length of the longest of the two bit arrays,
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with any missing bits (i.e. if one array is shorter than the
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other), taken to be 0.
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<pre>
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QBitArray a( 3 ), b( 2 );
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a[0] = 1; a[1] = 0; a[2] = 1; // a = [1 0 1]
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b[0] = 1; b[1] = 0; // b = [1 0]
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a |= b; // a = [1 0 1]
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</pre>
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<p> <p>See also <a href="#operator-and-eq">operator&=</a>(), <a href="#operator^-eq">operator^=</a>(), and <a href="#operator~">operator~</a>().
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<h3 class=fn><a href="qbitarray.html">QBitArray</a> <a name="operator~"></a>QBitArray::operator~ () const
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</h3>
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Returns a bit array that contains the inverted bits of this bit array.
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<p> Example:
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<pre>
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QBitArray a( 3 ), b;
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a[0] = 1; a[1] = 0; a[2] = 1; // a = [1 0 1]
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b = ~a; // b = [0 1 0]
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</pre>
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<h3 class=fn>bool <a name="resize"></a>QBitArray::resize ( uint size )
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</h3>
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Resizes the bit array to <em>size</em> bits and returns TRUE if the bit
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array could be resized; otherwise returns FALSE. The array becomes
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a null array if <em>size</em> == 0.
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<p> If the array is expanded, the new bits are set to 0.
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<p> <p>See also <a href="#size">size</a>().
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<h3 class=fn>void <a name="setBit"></a>QBitArray::setBit ( uint index, bool value )
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</h3>
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<p> Sets the bit at position <em>index</em> to <em>value</em>.
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<p> Equivalent to:
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<pre>
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if ( value )
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<a href="#setBit">setBit</a>( index );
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else
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<a href="#clearBit">clearBit</a>( index );
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</pre>
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<p> <p>See also <a href="#clearBit">clearBit</a>() and <a href="#toggleBit">toggleBit</a>().
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<h3 class=fn>void <a name="setBit-2"></a>QBitArray::setBit ( uint index )
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</h3>
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This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
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<p> Sets the bit at position <em>index</em> to 1.
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<p> <p>See also <a href="#clearBit">clearBit</a>() and <a href="#toggleBit">toggleBit</a>().
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<h3 class=fn>uint <a name="size"></a>QBitArray::size () const
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</h3>
|
||
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||
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<p> Returns the bit array's size (number of bits).
|
||
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<p> <p>See also <a href="#resize">resize</a>().
|
||
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||
|
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<h3 class=fn>bool <a name="testBit"></a>QBitArray::testBit ( uint index ) const
|
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</h3>
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Returns TRUE if the bit at position <em>index</em> is set, i.e. is 1;
|
||
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otherwise returns FALSE.
|
||
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<p> <p>See also <a href="#setBit">setBit</a>() and <a href="#clearBit">clearBit</a>().
|
||
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|
||
|
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<h3 class=fn>bool <a name="toggleBit"></a>QBitArray::toggleBit ( uint index )
|
||
|
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</h3>
|
||
|
|
Toggles the bit at position <em>index</em>.
|
||
|
|
<p> If the previous value was 0, the new value will be 1. If the
|
||
|
|
previous value was 1, the new value will be 0.
|
||
|
|
<p> <p>See also <a href="#setBit">setBit</a>() and <a href="#clearBit">clearBit</a>().
|
||
|
|
|
||
|
|
<hr><h2>Related Functions</h2>
|
||
|
|
<h3 class=fn><a href="qbitarray.html">QBitArray</a> <a name="operator-and"></a>operator& ( const <a href="qbitarray.html">QBitArray</a> & a1, const <a href="qbitarray.html">QBitArray</a> & a2 )
|
||
|
|
</h3>
|
||
|
|
|
||
|
|
<p> Returns the AND result between the bit arrays <em>a1</em> and <em>a2</em>.
|
||
|
|
<p> The result has the length of the longest of the two bit arrays,
|
||
|
|
with any missing bits (i.e. if one array is shorter than the
|
||
|
|
other), taken to be 0.
|
||
|
|
<p> <p>See also <a href="#operator-and-eq">QBitArray::operator&=</a>().
|
||
|
|
|
||
|
|
<h3 class=fn><a href="qdatastream.html">QDataStream</a> & <a name="operator-lt-lt"></a>operator<< ( <a href="qdatastream.html">QDataStream</a> & s, const <a href="qbitarray.html">QBitArray</a> & a )
|
||
|
|
</h3>
|
||
|
|
|
||
|
|
<p> Writes bit array <em>a</em> to stream <em>s</em>.
|
||
|
|
<p> <p>See also <a href="datastreamformat.html">Format of the QDataStream operators</a>.
|
||
|
|
|
||
|
|
<h3 class=fn><a href="qdatastream.html">QDataStream</a> & <a name="operator-gt-gt"></a>operator>> ( <a href="qdatastream.html">QDataStream</a> & s, <a href="qbitarray.html">QBitArray</a> & a )
|
||
|
|
</h3>
|
||
|
|
|
||
|
|
<p> Reads a bit array into <em>a</em> from stream <em>s</em>.
|
||
|
|
<p> <p>See also <a href="datastreamformat.html">Format of the QDataStream operators</a>.
|
||
|
|
|
||
|
|
<h3 class=fn><a href="qbitarray.html">QBitArray</a> <a name="operator^"></a>operator^ ( const <a href="qbitarray.html">QBitArray</a> & a1, const <a href="qbitarray.html">QBitArray</a> & a2 )
|
||
|
|
</h3>
|
||
|
|
|
||
|
|
<p> Returns the XOR result between the bit arrays <em>a1</em> and <em>a2</em>.
|
||
|
|
<p> The result has the length of the longest of the two bit arrays,
|
||
|
|
with any missing bits (i.e. if one array is shorter than the
|
||
|
|
other), taken to be 0.
|
||
|
|
<p> <p>See also <a href="#operator^">QBitArray::operator^</a>().
|
||
|
|
|
||
|
|
<h3 class=fn><a href="qbitarray.html">QBitArray</a> <a name="operator|"></a>operator| ( const <a href="qbitarray.html">QBitArray</a> & a1, const <a href="qbitarray.html">QBitArray</a> & a2 )
|
||
|
|
</h3>
|
||
|
|
|
||
|
|
<p> Returns the OR result between the bit arrays <em>a1</em> and <em>a2</em>.
|
||
|
|
<p> The result has the length of the longest of the two bit arrays,
|
||
|
|
with any missing bits (i.e. if one array is shorter than the
|
||
|
|
other), taken to be 0.
|
||
|
|
<p> <p>See also <a href="#operator|-eq">QBitArray::operator|=</a>().
|
||
|
|
|
||
|
|
<!-- eof -->
|
||
|
|
<hr><p>
|
||
|
|
This file is part of the <a href="index.html">Qt toolkit</a>.
|
||
|
|
Copyright © 1995-2007
|
||
|
|
<a href="http://www.trolltech.com/">Trolltech</a>. All Rights Reserved.<p><address><hr><div align=center>
|
||
|
|
<table width=100% cellspacing=0 border=0><tr>
|
||
|
|
<td>Copyright © 2007
|
||
|
|
<a href="troll.html">Trolltech</a><td align=center><a href="trademarks.html">Trademarks</a>
|
||
|
|
<td align=right><div align=right>Qt 3.3.8</div>
|
||
|
|
</table></div></address></body>
|
||
|
|
</html>
|