# QBitArray Class Reference
## [[QtCore](index.htm) module]
该QBitArray类提供了一组位。[More...](#details)
### Methods
* `__init__ (self)`
* `__init__ (self, int size, bool value = False)`
* `__init__ (self, QBitArray other)`
* `bool at (self, int i)`
* `clear (self)`
* `clearBit (self, int i)`
* `int count (self)`
* `int count (self, bool on)`
* `detach (self)`
* `fill (self, bool val, int first, int last)`
* `bool fill (self, bool value, int size = -1)`
* `bool isDetached (self)`
* `bool isEmpty (self)`
* `bool isNull (self)`
* `resize (self, int size)`
* `setBit (self, int i)`
* `setBit (self, int i, bool val)`
* `int size (self)`
* `swap (self, QBitArray other)`
* `bool testBit (self, int i)`
* `bool toggleBit (self, int i)`
* `truncate (self, int pos)`
### Special Methods
* `QBitArray __and__ (self, QBitArray)`
* `bool __eq__ (self, QBitArray a)`
* `bool __getitem__ (self, int i)`
* `int __hash__ (self)`
* `QBitArray __iand__ (self, QBitArray)`
* `QBitArray __invert__ (self)`
* `QBitArray __ior__ (self, QBitArray)`
* `QBitArray __ixor__ (self, QBitArray)`
* `__len__ (self)`
* `bool __ne__ (self, QBitArray a)`
* `QBitArray __or__ (self, QBitArray)`
* `QBitArray __xor__ (self, QBitArray)`
* * *
## Detailed Description
该QBitArray类提供了一组位。
一个QBitArray是一个数组,它可以访问各个位,并提供运营商([AND](qbitarray.html#operator-and),[OR](qbitarray.html#operator-7c),[XOR](qbitarray.html#operator-5e)和[NOT](qbitarray.html#operator-7e)对位的整个数组)的工作。它使用[implicit sharing](index.htm)(复制上写的),以减少内存使用量,避免不必要的数据复制。
下面的代码创建一个包含200位的QBitArray初始化为False ( 0 ) :
```
QBitArray ba(200);
```
要初始化位为True ,要么通过`true`作为第二个参数的构造函数,或调用[fill](qbitarray.html#fill)( )以后。
QBitArray使用基于0的索引,就像C + +中的数组。要访问该位在特定索引位置,可以使用操作符[] ( ) 。对非const位阵列,操作符[ ] ( )返回一个引用位,可以在赋值的左侧使用。例如:
```
QBitArray ba;
ba.resize(3);
ba[0] = true;
ba[1] = false;
ba[2] = true;
```
由于技术原因,它是更有效地使用[testBit](qbitarray.html#testBit)()和[setBit](qbitarray.html#setBit)( )来访问数组比运营商的位[] ( ) 。例如:
```
QBitArray ba(3);
ba.setBit(0, true);
ba.setBit(1, false);
ba.setBit(2, true);
```
QBitArray支持`&`([AND](qbitarray.html#operator-and)) ,`|`([OR](qbitarray.html#operator-7c)) ,`^`([XOR](qbitarray.html#operator-5e)) ,`~`([NOT](qbitarray.html#operator-7e)) ,以及`&=`,`|=`和`^=`。这些运营商在相同的方式相同名称的内置C + +的位运算符的工作。例如:
```
QBitArray x(5);
x.setBit(3, true);
// x: [ 0, 0, 0, 1, 0 ]
QBitArray y(5);
y.setBit(4, true);
// y: [ 0, 0, 0, 0, 1 ]
x |= y;
// x: [ 0, 0, 0, 1, 1 ]
```
由于历史原因, QBitArray一个空位阵列和一个空的位阵列之间的区别。一_null_位阵列是使用QBitArray的默认构造函数初始化一个位阵列。一个_empty_位阵列中的任何位数组大小为0 。空阵位总是空的,但一个空的位阵列不一定空:
```
QBitArray().isNull(); // returns true
QBitArray().isEmpty(); // returns true
QBitArray(0).isNull(); // returns false
QBitArray(0).isEmpty(); // returns true
QBitArray(3).isNull(); // returns false
QBitArray(3).isEmpty(); // returns false
```
之外的全部功能[isNull](qbitarray.html#isNull)( )把空位阵列一样空位阵列,例如,[QBitArray](qbitarray.html#QBitArray)()比较等于QBitArray (0)。我们建议您始终使用[isEmpty](qbitarray.html#isEmpty)()和避免[isNull](qbitarray.html#isNull)( ) 。
* * *
## Method Documentation
```
QBitArray.__init__ (self)
```
构造一个空数组位。
**See also** [isEmpty](qbitarray.html#isEmpty)( ) 。
```
QBitArray.__init__ (self, int size, bool value = False)
```
构造一个位阵列包含_size_位。该位与初始化_value_,默认为False ( 0 ) 。
```
QBitArray.__init__ (self, QBitArray other)
```
构造的副本_other_。
该操作需要[constant time](index.htm#constant-time),因为[QBitArray](qbitarray.html) is [implicitly shared](index.htm#implicitly-shared)。这使得返回一个[QBitArray](qbitarray.html)从非常快的函数。如果共享的实例被改性时,其将被复制(复制写入时) ,而这需要[linear time](index.htm#linear-time)。
**See also** [operator=](qbitarray.html#operator-eq)( ) 。
```
bool QBitArray.at (self, int i)
```
返回索引位置的位值_i_。
_i_必须是位阵列中的一个有效的索引位置(即0 \u003c =_i_\u003c[size](qbitarray.html#size)())。
**See also** [operator[]](qbitarray.html#operator-5b-5d)( ) 。
```
QBitArray.clear (self)
```
清除该位阵列的内容,并使其为空。
**See also** [resize](qbitarray.html#resize)()和[isEmpty](qbitarray.html#isEmpty)( ) 。
```
QBitArray.clearBit (self, int i)
```
设置位索引位置_i_为0。
_i_必须是位阵列中的一个有效的索引位置(即0 \u003c =_i_\u003c[size](qbitarray.html#size)())。
**See also** [setBit](qbitarray.html#setBit)()和[toggleBit](qbitarray.html#toggleBit)( ) 。
```
int QBitArray.count (self)
```
同[size](qbitarray.html#size)( ) 。
```
int QBitArray.count (self, bool on)
```
If _on_诚然,此函数返回所存储的比特数组中1位的号码,否则返回0位的数量。
```
QBitArray.detach (self)
```
```
QBitArray.fill (self, bool val, int first, int last)
```
设置该位阵列中每一个位_value_如果成功,则返回True ,否则返回False 。如果_size_是从-1 (默认值)不同,该位阵列大小调整为_size_事前。
例如:
```
[QBitArray](qbitarray.html) ba(8);
ba.fill(true);
// ba: [ 1, 1, 1, 1, 1, 1, 1, 1 ]
ba.fill(false, 2);
// ba: [ 0, 0 ]
```
**See also** [resize](qbitarray.html#resize)( ) 。
```
bool QBitArray.fill (self, bool value, int size = -1)
```
这是一个重载函数。
设置位在索引位置_begin_达,但不包括_end_至_value_。
_begin_和_end_必须是位阵列中的一个有效的索引位置(即0 \u003c =_begin_\u003c =[size](qbitarray.html#size)()和0 \u003c=_end_\u003c =[size](qbitarray.html#size)())。
```
bool QBitArray.isDetached (self)
```
```
bool QBitArray.isEmpty (self)
```
返回True如果该位数组的大小为0 ,否则返回False 。
**See also** [size](qbitarray.html#size)( ) 。
```
bool QBitArray.isNull (self)
```
返回True如果该位数组为null ,否则返回False 。
例如:
```
[QBitArray](qbitarray.html)().isNull(); // returns true
[QBitArray](qbitarray.html)(0).isNull(); // returns false
[QBitArray](qbitarray.html)(3).isNull(); // returns false
```
Qt后,由于历史的原因空位阵列和空bit数组之间的区别。对于大多数应用来说,重要的是一个位阵列中是否包含任何数据,这可以通过确定[isEmpty](qbitarray.html#isEmpty)( ) 。
**See also** [isEmpty](qbitarray.html#isEmpty)( ) 。
```
QBitArray.resize (self, int size)
```
调整大小的位阵列_size_位。
If _size_大于该电流的大小,位阵列被扩展以使其_size_与额外的比特位添加到末尾。新的位被初始化为False ( 0 ) 。
If _size_小于该电流的大小,比特被从端部除去。
**See also** [size](qbitarray.html#size)( ) 。
```
QBitArray.setBit (self, int i)
```
设置位索引位置_i_为1。
_i_必须是位阵列中的一个有效的索引位置(即0 \u003c =_i_\u003c[size](qbitarray.html#size)())。
**See also** [clearBit](qbitarray.html#clearBit)()和[toggleBit](qbitarray.html#toggleBit)( ) 。
```
QBitArray.setBit (self, int i, bool val)
```
这是一个重载函数。
设置位索引位置_i_至_value_。
```
int QBitArray.size (self)
```
返回所存储的比特阵列中的比特数。
**See also** [resize](qbitarray.html#resize)( ) 。
```
QBitArray.swap (self, QBitArray other)
```
掉期位阵列_other_与此位阵列。这个操作是非常快的,而且永远不会。
此功能被引入Qt的4.8 。
```
bool QBitArray.testBit (self, int i)
```
返回True ,如果该位索引位置_i_为1 ,否则返回False 。
_i_必须是位阵列中的一个有效的索引位置(即0 \u003c =_i_\u003c[size](qbitarray.html#size)())。
**See also** [setBit](qbitarray.html#setBit)()和[clearBit](qbitarray.html#clearBit)( ) 。
```
bool QBitArray.toggleBit (self, int i)
```
反转索引位置的位值_i_,返回该位为任一真(如果它被设置)或False (如果它是未设置)的前一个值。
如果以前的值为0 ,则新值将是1 。如果以前的值为1 ,新值将为0 。
_i_必须是位阵列中的一个有效的索引位置(即0 \u003c =_i_\u003c[size](qbitarray.html#size)())。
**See also** [setBit](qbitarray.html#setBit)()和[clearBit](qbitarray.html#clearBit)( ) 。
```
QBitArray.truncate (self, int pos)
```
截断位阵列索引位置_pos_。
If _pos_超出了数组的结尾,没有任何反应。
**See also** [resize](qbitarray.html#resize)( ) 。
```
QBitArray QBitArray.__and__ (self, QBitArray)
```
[
```
bool QBitArray.__eq__ (self, QBitArray a)
```
```
bool QBitArray.__getitem__ (self, int i)
```
```
int QBitArray.__hash__ (self)
```
](qbitarray.html)
```
QBitArray QBitArray.__iand__ (self, QBitArray)
```
[](qbitarray.html)
```
QBitArray QBitArray.__invert__ (self)
```
[](qbitarray.html)
```
QBitArray QBitArray.__ior__ (self, QBitArray)
```
[](qbitarray.html)
```
QBitArray QBitArray.__ixor__ (self, QBitArray)
```
[
```
QBitArray.__len__ (self)
```
```
bool QBitArray.__ne__ (self, QBitArray a)
```
](qbitarray.html)
```
QBitArray QBitArray.__or__ (self, QBitArray)
```
[](qbitarray.html)
```
QBitArray QBitArray.__xor__ (self, QBitArray)
```
[](qbitarray.html)
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- QShortcut Class Reference
- QShortcutEvent Class Reference
- QShowEvent Class Reference
- QSignalMapper Class Reference
- QSignalTransition Class Reference
- QSimpleXmlNodeModel Class Reference
- QSize Class Reference
- QSizeF Class Reference
- QSizeGrip Class Reference
- QSizePolicy Class Reference
- QSlider Class Reference
- QSocketNotifier Class Reference
- QSortFilterProxyModel Class Reference
- QSound Class Reference
- QSourceLocation Class Reference
- QSpacerItem Class Reference
- QSpinBox Class Reference
- QSplashScreen Class Reference
- QSplitter Class Reference
- QSplitterHandle Class Reference
- QSql Class Reference
- QSqlDatabase Class Reference
- QSqlDriver Class Reference
- QSqlDriverCreatorBase Class Reference
- QSqlError Class Reference
- QSqlField Class Reference
- QSqlIndex Class Reference
- QSqlQuery Class Reference
- QSqlQueryModel Class Reference
- QSqlRecord Class Reference
- QSqlRelation Class Reference
- QSqlRelationalDelegate Class Reference
- QSqlRelationalTableModel Class Reference
- QSqlResult Class Reference
- QSqlTableModel Class Reference
- Qt4.7文档翻译:Qt样式单参考,Qt Style Sheets Reference
- QSsl Class Reference
- QSslCertificate Class Reference
- QSslCipher Class Reference
- QSslConfiguration Class Reference
- QSslError Class Reference
- QSslKey Class Reference
- QSslSocket Class Reference
- QStackedLayout Class Reference
- QStackedWidget Class Reference
- QStandardItem Class Reference
- QStandardItemModel Class Reference
- QState Class Reference
- QStateMachine Class Reference
- QStaticText Class Reference
- QStatusBar Class Reference
- QStatusTipEvent Class Reference
- QString Class Reference
- QStringList Class Reference
- QStringListModel Class Reference
- QStringMatcher Class Reference
- QStringRef Class Reference
- QStyle Class Reference
- QStyledItemDelegate Class Reference
- QStyleFactory Class Reference
- QStyleHintReturn Class Reference
- QStyleHintReturnMask Class Reference
- QStyleHintReturnVariant Class Reference
- QStyleOption Class Reference
- QStyleOptionButton Class Reference
- QStyleOptionComboBox Class Reference
- QStyleOptionComplex Class Reference
- QStyleOptionDockWidget Class Reference
- QStyleOptionDockWidgetV2 Class Reference
- QStyleOptionFocusRect Class Reference
- QStyleOptionFrame Class Reference
- QStyleOptionFrameV2 Class Reference
- QStyleOptionFrameV3 Class Reference
- QStyleOptionGraphicsItem Class Reference
- QStyleOptionGroupBox Class Reference
- QStyleOptionHeader Class Reference
- QStyleOptionMenuItem Class Reference
- QStyleOptionProgressBar Class Reference
- QStyleOptionProgressBarV2 Class Reference
- QStyleOptionRubberBand Class Reference
- QStyleOptionSizeGrip Class Reference
- QStyleOptionSlider Class Reference
- QStyleOptionSpinBox Class Reference
- QStyleOptionTab Class Reference
- QStyleOptionTabBarBase Class Reference
- QStyleOptionTabBarBaseV2 Class Reference
- QStyleOptionTabV2 Class Reference
- QStyleOptionTabV3 Class Reference
- QStyleOptionTabWidgetFrame Class Reference
- QStyleOptionTabWidgetFrameV2 Class Reference
- QStyleOptionTitleBar Class Reference
- QStyleOptionToolBar Class Reference
- QStyleOptionToolBox Class Reference
- QStyleOptionToolBoxV2 Class Reference
- QStyleOptionToolButton Class Reference
- QStyleOptionViewItem Class Reference
- QStyleOptionViewItemV2 Class Reference
- QStyleOptionViewItemV3 Class Reference
- QStyleOptionViewItemV4 Class Reference
- QStylePainter Class Reference
- QSvgGenerator Class Reference
- QSvgRenderer Class Reference
- QSvgWidget Class Reference
- QSwipeGesture Class Reference
- QSyntaxHighlighter Class Reference
- QSysInfo Class Reference
- QSystemLocale Class Reference
- QSystemSemaphore Class Reference
- QSystemTrayIcon Class Reference
- Qt Class Reference
- QTabBar Class Reference
- QTabletEvent Class Reference
- QTableView Class Reference
- QTableWidget Class Reference
- QTableWidgetItem Class Reference
- QTableWidgetSelectionRange Class Reference
- QTabWidget Class Reference
- QTapAndHoldGesture Class Reference
- QTapGesture Class Reference
- QTcpServer Class Reference
- QTcpSocket Class Reference
- QTemporaryFile Class Reference
- QTest Class Reference
- QTextBlock Class Reference
- QTextBlockFormat Class Reference
- QTextBlockGroup Class Reference
- QTextBlockUserData Class Reference
- QTextBoundaryFinder Class Reference
- QTextBrowser Class Reference
- QTextCharFormat Class Reference
- QTextCodec Class Reference
- QTextCursor Class Reference
- QTextDecoder Class Reference
- QTextDocument Class Reference
- QTextDocumentFragment Class Reference
- QTextDocumentWriter Class Reference
- QTextEdit Class Reference
- QTextEncoder Class Reference
- QTextFormat Class Reference
- QTextFragment Class Reference
- QTextFrame Class Reference
- QTextFrameFormat Class Reference
- QTextImageFormat Class Reference
- QTextInlineObject Class Reference
- QTextItem Class Reference
- QTextLayout Class Reference
- QTextLength Class Reference
- QTextLine Class Reference
- QTextList Class Reference
- QTextListFormat Class Reference
- QTextObject Class Reference
- QTextObjectInterface Class Reference
- QTextOption Class Reference
- QTextStream Class Reference
- QTextTable Class Reference
- QTextTableCell Class Reference
- QTextTableCellFormat Class Reference
- QTextTableFormat Class Reference
- QThread Class Reference
- QThreadPool Class Reference
- QTime Class Reference
- QTimeEdit Class Reference
- QTimeLine Class Reference
- QTimer Class Reference
- QTimerEvent Class Reference
- QToolBar Class Reference
- QToolBox Class Reference
- QToolButton Class Reference
- QToolTip Class Reference
- QTouchEvent Class Reference
- Reference
- QTransform Class Reference
- QTranslator Class Reference
- QTreeView Class Reference
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- QTreeWidgetItemIterator Class Reference
- QUdpSocket Class Reference
- QUndoCommand Class Reference
- QUndoGroup Class Reference
- QUndoStack Class Reference
- QUndoView Class Reference
- QUrl Class Reference
- QUrlInfo Class Reference
- QUuid Class Reference
- QValidator Class Reference
- QVariant Class Reference
- QVariantAnimation Class Reference
- QVBoxLayout Class Reference
- QVector2D Class Reference
- QVector3D Class Reference
- QVector4D Class Reference
- QVideoFrame Class Reference
- QVideoSurfaceFormat Class Reference
- QWaitCondition Class Reference
- QWebDatabase Class Reference
- QWebElement Class Reference
- QWebElementCollection Class Reference
- QWebFrame Class Reference
- QWebHistory Class Reference
- QWebHistoryInterface Class Reference
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- QWebHitTestResult Class Reference
- QWebInspector Class Reference
- QWebPage Class Reference
- QWebPluginFactory Class Reference
- QWebSecurityOrigin Class Reference
- QWebSettings Class Reference
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- QWhatsThis Class Reference
- QWhatsThisClickedEvent Class Reference
- QWheelEvent Class Reference
- QWidget Class Reference
- QWidgetAction Class Reference
- QWidgetItem Class Reference
- QWindowStateChangeEvent Class Reference
- QWizard Class Reference
- QWizardPage Class Reference
- QWorkspace Class Reference
- QWriteLocker Class Reference
- QX11EmbedContainer Class Reference
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- QX11Info Class Reference
- QXmlAttributes Class Reference
- QXmlContentHandler Class Reference
- QXmlDeclHandler Class Reference
- QXmlDefaultHandler Class Reference
- QXmlDTDHandler Class Reference
- QXmlEntityResolver Class Reference
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- QXmlFormatter Class Reference
- QXmlInputSource Class Reference
- QXmlItem Class Reference
- QXmlLexicalHandler Class Reference
- QXmlLocator Class Reference
- QXmlName Class Reference
- QXmlNamePool Class Reference
- QXmlNamespaceSupport Class Reference
- QXmlNodeModelIndex Class Reference
- QXmlParseException Class Reference
- QXmlQuery Class Reference
- QXmlReader Class Reference
- QXmlResultItems Class Reference
- QXmlSchema Class Reference
- QXmlSchemaValidator Class Reference
- QXmlSerializer Class Reference
- QXmlSimpleReader Class Reference
- QXmlStreamAttribute Class Reference
- QXmlStreamAttributes Class Reference
- QXmlStreamEntityDeclaration Class Reference
- QXmlStreamEntityResolver Class Reference
- QXmlStreamNamespaceDeclaration Class Reference
- QXmlStreamNotationDeclaration Class Reference
- QXmlStreamReader Class Reference
- QXmlStreamWriter Class Reference