diff options
Diffstat (limited to 'doc/man/man3/qbitarray.3qt')
| -rw-r--r-- | doc/man/man3/qbitarray.3qt | 372 |
1 files changed, 372 insertions, 0 deletions
diff --git a/doc/man/man3/qbitarray.3qt b/doc/man/man3/qbitarray.3qt new file mode 100644 index 000000000..3f7777a4c --- /dev/null +++ b/doc/man/man3/qbitarray.3qt @@ -0,0 +1,372 @@ +'\" t +.TH QBitArray 3qt "2 February 2007" "Trolltech AS" \" -*- nroff -*- +.\" Copyright 1992-2007 Trolltech ASA. All rights reserved. See the +.\" license file included in the distribution for a complete license +.\" statement. +.\" +.ad l +.nh +.SH NAME +QBitArray \- Array of bits +.SH SYNOPSIS +All the functions in this class are reentrant when Qt is built with thread support.</p> +.PP +\fC#include <qbitarray.h>\fR +.PP +Inherits QByteArray. +.PP +.SS "Public Members" +.in +1c +.ti -1c +.BI "\fBQBitArray\fR ()" +.br +.ti -1c +.BI "\fBQBitArray\fR ( uint size )" +.br +.ti -1c +.BI "\fBQBitArray\fR ( const QBitArray & a )" +.br +.ti -1c +.BI "QBitArray & \fBoperator=\fR ( const QBitArray & a )" +.br +.ti -1c +.BI "uint \fBsize\fR () const" +.br +.ti -1c +.BI "bool \fBresize\fR ( uint size )" +.br +.ti -1c +.BI "bool \fBfill\fR ( bool v, int size = -1 )" +.br +.ti -1c +.BI "virtual void \fBdetach\fR ()" +.br +.ti -1c +.BI "QBitArray \fBcopy\fR () const" +.br +.ti -1c +.BI "bool \fBtestBit\fR ( uint index ) const" +.br +.ti -1c +.BI "void \fBsetBit\fR ( uint index )" +.br +.ti -1c +.BI "void \fBsetBit\fR ( uint index, bool value )" +.br +.ti -1c +.BI "void \fBclearBit\fR ( uint index )" +.br +.ti -1c +.BI "bool \fBtoggleBit\fR ( uint index )" +.br +.ti -1c +.BI "bool \fBat\fR ( uint index ) const" +.br +.ti -1c +.BI "QBitVal \fBoperator[]\fR ( int index )" +.br +.ti -1c +.BI "bool \fBoperator[]\fR ( int index ) const" +.br +.ti -1c +.BI "QBitArray & \fBoperator&=\fR ( const QBitArray & a )" +.br +.ti -1c +.BI "QBitArray & \fBoperator|=\fR ( const QBitArray & a )" +.br +.ti -1c +.BI "QBitArray & \fBoperator^=\fR ( const QBitArray & a )" +.br +.ti -1c +.BI "QBitArray \fBoperator~\fR () const" +.br +.in -1c +.SH RELATED FUNCTION DOCUMENTATION +.in +1c +.ti -1c +.BI "QBitArray \fBoperator&\fR ( const QBitArray & a1, const QBitArray & a2 )" +.br +.ti -1c +.BI "QBitArray \fBoperator|\fR ( const QBitArray & a1, const QBitArray & a2 )" +.br +.ti -1c +.BI "QBitArray \fBoperator^\fR ( const QBitArray & a1, const QBitArray & a2 )" +.br +.ti -1c +.BI "QDataStream & \fBoperator<<\fR ( QDataStream & s, const QBitArray & a )" +.br +.ti -1c +.BI "QDataStream & \fBoperator>>\fR ( QDataStream & s, QBitArray & a )" +.br +.in -1c +.SH DESCRIPTION +The QBitArray class provides an array of bits. +.PP +Because QBitArray is a QMemArray, it uses explicit sharing with a reference count. +.PP +A QBitArray is a special byte array that can access individual bits and perform bit-operations (AND, OR, XOR and NOT) on entire arrays or bits. +.PP +Bits can be manipulated by the setBit() and clearBit() functions, but it is also possible to use the indexing [] operator to test and set individual bits. The [] operator is a little slower than setBit() and clearBit() because some tricks are retquired to implement single-bit assignments. +.PP +Example: +.PP +.nf +.br + QBitArray a(3); +.br + a.setBit( 0 ); +.br + a.clearBit( 1 ); +.br + a.setBit( 2 ); // a = [1 0 1] +.br +.br + QBitArray b(3); +.br + b[0] = 1; +.br + b[1] = 1; +.br + b[2] = 0; // b = [1 1 0] +.br +.br + QBitArray c; +.br + c = ~a & b; // c = [0 1 0] +.br +.fi +.PP +When a QBitArray is constructed the bits are uninitialized. Use fill() to set all the bits to 0 or 1. The array can be resized with resize() and copied with copy(). Bits can be set with setBit() and cleared with clearBit(). Bits can be toggled with toggleBit(). A bit's value can be obtained with testBit() and with at(). +.PP +QBitArray supports the & (AND), | (OR), ^ (XOR) and ~ (NOT) operators. +.PP +See also Collection Classes, Implicitly and Explicitly Shared Classes, and Non-GUI Classes. +.SH MEMBER FUNCTION DOCUMENTATION +.SH "QBitArray::QBitArray ()" +Constructs an empty bit array. +.SH "QBitArray::QBitArray ( uint size )" +Constructs a bit array of \fIsize\fR bits. The bits are uninitialized. +.PP +See also fill(). +.SH "QBitArray::QBitArray ( const QBitArray & a )" +Constructs a shallow copy of \fIa\fR. +.SH "bool QBitArray::at ( uint index ) const" +Returns the value (0 or 1) of the bit at position \fIindex\fR. +.PP +See also operator[](). +.SH "void QBitArray::clearBit ( uint index )" +Clears the bit at position \fIindex\fR, i.e. sets it to 0. +.PP +See also setBit() and toggleBit(). +.SH "QBitArray QBitArray::copy () const" +Returns a deep copy of the bit array. +.PP +See also detach(). +.SH "void QBitArray::detach ()\fC [virtual]\fR" +Detaches from shared bit array data and makes sure that this bit array is the only one referring to the data. +.PP +If multiple bit arrays share common data, this bit array dereferences the data and gets a copy of the data. Nothing happens if there is only a single reference. +.PP +See also copy(). +.PP +Reimplemented from QMemArray. +.SH "bool QBitArray::fill ( bool v, int size = -1 )" +Fills the bit array with \fIv\fR (1's if \fIv\fR is TRUE, or 0's if \fIv\fR is FALSE). +.PP +fill() resizes the bit array to \fIsize\fR bits if \fIsize\fR is nonnegative. +.PP +Returns FALSE if a nonnegative \fIsize\fR was specified and the bit array could not be resized; otherwise returns TRUE. +.PP +See also resize(). +.SH "QBitArray & QBitArray::operator&= ( const QBitArray & a )" +Performs the AND operation between all bits in this bit array and \fIa\fR. Returns a reference to this bit array. +.PP +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. +.PP +.nf +.br + QBitArray a( 3 ), b( 2 ); +.br + a[0] = 1; a[1] = 0; a[2] = 1; // a = [1 0 1] +.br + b[0] = 1; b[1] = 0; // b = [1 0] +.br + a &= b; // a = [1 0 0] +.br +.fi +.PP +See also operator|=(), operator^=(), and operator~(). +.SH "QBitArray & QBitArray::operator= ( const QBitArray & a )" +Assigns a shallow copy of \fIa\fR to this bit array and returns a reference to this array. +.SH "QBitVal QBitArray::operator[] ( int index )" +Implements the [] operator for bit arrays. +.PP +The returned QBitVal is a context object. It makes it possible to get and set a single bit value by its \fIindex\fR position. +.PP +Example: +.PP +.nf +.br + QBitArray a( 3 ); +.br + a[0] = 0; +.br + a[1] = 1; +.br + a[2] = a[0] ^ a[1]; +.br +.fi +.PP +The functions testBit(), setBit() and clearBit() are faster. +.PP +See also at(). +.SH "bool QBitArray::operator[] ( int index ) const" +This is an overloaded member function, provided for convenience. It behaves essentially like the above function. +.PP +Implements the [] operator for constant bit arrays. +.SH "QBitArray & QBitArray::operator^= ( const QBitArray & a )" +Performs the XOR operation between all bits in this bit array and \fIa\fR. Returns a reference to this bit array. +.PP +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. +.PP +.nf +.br + QBitArray a( 3 ), b( 2 ); +.br + a[0] = 1; a[1] = 0; a[2] = 1; // a = [1 0 1] +.br + b[0] = 1; b[1] = 0; // b = [1 0] +.br + a ^= b; // a = [0 0 1] +.br +.fi +.PP +See also operator&=(), operator|=(), and operator~(). +.SH "QBitArray & QBitArray::operator|= ( const QBitArray & a )" +Performs the OR operation between all bits in this bit array and \fIa\fR. Returns a reference to this bit array. +.PP +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. +.PP +.nf +.br + QBitArray a( 3 ), b( 2 ); +.br + a[0] = 1; a[1] = 0; a[2] = 1; // a = [1 0 1] +.br + b[0] = 1; b[1] = 0; // b = [1 0] +.br + a |= b; // a = [1 0 1] +.br +.fi +.PP +See also operator&=(), operator^=(), and operator~(). +.SH "QBitArray QBitArray::operator~ () const" +Returns a bit array that contains the inverted bits of this bit array. +.PP +Example: +.PP +.nf +.br + QBitArray a( 3 ), b; +.br + a[0] = 1; a[1] = 0; a[2] = 1; // a = [1 0 1] +.br + b = ~a; // b = [0 1 0] +.br +.fi +.SH "bool QBitArray::resize ( uint size )" +Resizes the bit array to \fIsize\fR bits and returns TRUE if the bit array could be resized; otherwise returns FALSE. The array becomes a null array if \fIsize\fR == 0. +.PP +If the array is expanded, the new bits are set to 0. +.PP +See also size(). +.SH "void QBitArray::setBit ( uint index, bool value )" +Sets the bit at position \fIindex\fR to \fIvalue\fR. +.PP +Equivalent to: +.PP +.nf +.br + if ( value ) +.br + setBit( index ); +.br + else +.br + clearBit( index ); +.br +.fi +.PP +See also clearBit() and toggleBit(). +.SH "void QBitArray::setBit ( uint index )" +This is an overloaded member function, provided for convenience. It behaves essentially like the above function. +.PP +Sets the bit at position \fIindex\fR to 1. +.PP +See also clearBit() and toggleBit(). +.SH "uint QBitArray::size () const" +Returns the bit array's size (number of bits). +.PP +See also resize(). +.SH "bool QBitArray::testBit ( uint index ) const" +Returns TRUE if the bit at position \fIindex\fR is set, i.e. is 1; otherwise returns FALSE. +.PP +See also setBit() and clearBit(). +.SH "bool QBitArray::toggleBit ( uint index )" +Toggles the bit at position \fIindex\fR. +.PP +If the previous value was 0, the new value will be 1. If the previous value was 1, the new value will be 0. +.PP +See also setBit() and clearBit(). +.SH RELATED FUNCTION DOCUMENTATION +.SH "QBitArray operator& ( const QBitArray & a1, const QBitArray & a2 )" +Returns the AND result between the bit arrays \fIa1\fR and \fIa2\fR. +.PP +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. +.PP +See also QBitArray::operator&=(). +.SH "QDataStream & operator<< ( QDataStream & s, const QBitArray & a )" +Writes bit array \fIa\fR to stream \fIs\fR. +.PP +See also Format of the QDataStream operators. +.SH "QDataStream & operator>> ( QDataStream & s, QBitArray & a )" +Reads a bit array into \fIa\fR from stream \fIs\fR. +.PP +See also Format of the QDataStream operators. +.SH "QBitArray operator^ ( const QBitArray & a1, const QBitArray & a2 )" +Returns the XOR result between the bit arrays \fIa1\fR and \fIa2\fR. +.PP +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. +.PP +See also QBitArray::operator^(). +.SH "QBitArray operator| ( const QBitArray & a1, const QBitArray & a2 )" +Returns the OR result between the bit arrays \fIa1\fR and \fIa2\fR. +.PP +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. +.PP +See also QBitArray::operator|=(). + +.SH "SEE ALSO" +.BR http://doc.trolltech.com/qbitarray.html +.BR http://www.trolltech.com/faq/tech.html +.SH COPYRIGHT +Copyright 1992-2007 Trolltech ASA, http://www.trolltech.com. See the +license file included in the distribution for a complete license +statement. +.SH AUTHOR +Generated automatically from the source code. +.SH BUGS +If you find a bug in Qt, please report it as described in +.BR http://doc.trolltech.com/bughowto.html . +Good bug reports help us to help you. Thank you. +.P +The definitive Qt documentation is provided in HTML format; it is +located at $QTDIR/doc/html and can be read using Qt Assistant or with +a web browser. This man page is provided as a convenience for those +users who prefer man pages, although this format is not officially +supported by Trolltech. +.P +If you find errors in this manual page, please report them to +.BR [email protected] . +Please include the name of the manual page (qbitarray.3qt) and the Qt +version (3.3.8). |