QBitArray Class Reference

\inmodule QtCore More...

#include <qbitarray.h>

Collaboration diagram for QBitArray:

Public Types
typedef QByteArray::DataPointer	DataPtr

Public Member Functions
	QBitArray () noexcept
	Constructs an empty bit array.
	QBitArray (qsizetype size, bool val=false)
	Constructs a bit array containing size bits.
	QBitArray (const QBitArray &other) noexcept
	Constructs a copy of other.
QBitArray &	operator= (const QBitArray &other) noexcept
	Assigns other to this bit array and returns a reference to this bit array.
	QBitArray (QBitArray &&other) noexcept
	Move-constructs a QBitArray instance, making it point at the same object that other was pointing to.
void	swap (QBitArray &other) noexcept
qsizetype	size () const
	Returns the number of bits stored in the bit array.
qsizetype	count () const
	Same as size().
qsizetype	count (bool on) const
	If on is true, this function returns the number of 1-bits stored in the bit array; otherwise the number of 0-bits is returned.
bool	isEmpty () const
	Returns true if this bit array has size 0; otherwise returns false.
bool	isNull () const
	Returns true if this bit array is null; otherwise returns false.
void	resize (qsizetype size)
	Resizes the bit array to size bits.
void	detach ()
bool	isDetached () const
void	clear ()
	Clears the contents of the bit array and makes it empty.
bool	testBit (qsizetype i) const
	Returns true if the bit at index position i is 1; otherwise returns false.
void	setBit (qsizetype i)
	Sets the bit at index position i to 1.
void	setBit (qsizetype i, bool val)
	This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.Sets the bit at index position i to value.
void	clearBit (qsizetype i)
	Sets the bit at index position i to 0.
bool	toggleBit (qsizetype i)
	Inverts the value of the bit at index position i, returning the previous value of that bit as either true (if it was set) or false (if it was unset).
bool	at (qsizetype i) const
	Returns the value of the bit at index position i.
QBitRef	operator[] (qsizetype i)
	Returns the bit at index position i as a modifiable reference.
bool	operator[] (qsizetype i) const
	This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.
QBitArray &	operator&= (const QBitArray &)
	Performs the AND operation between all bits in this bit array and other.
QBitArray &	operator|= (const QBitArray &)
	Performs the OR operation between all bits in this bit array and other.
QBitArray &	operator^= (const QBitArray &)
	Performs the XOR operation between all bits in this bit array and other.
QBitArray	operator~ () const
	Returns a bit array that contains the inverted bits of this bit array.
bool	operator== (const QBitArray &other) const
	Returns true if other is equal to this bit array; otherwise returns false.
bool	operator!= (const QBitArray &other) const
	Returns true if other is not equal to this bit array; otherwise returns false.
bool	fill (bool val, qsizetype size=-1)
	Sets every bit in the bit array to value, returning true if successful; otherwise returns false.
void	fill (bool val, qsizetype first, qsizetype last)
	This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.Sets bits at index positions begin up to (but not including) end to value.
void	truncate (qsizetype pos)
	Truncates the bit array at index position pos.
const char *	bits () const
quint32	toUInt32 (QSysInfo::Endian endianness, bool *ok=nullptr) const noexcept
DataPtr &	data_ptr ()

Static Public Member Functions
static QBitArray	fromBits (const char *data, qsizetype len)

Friends
Q_CORE_EXPORT QDataStream &	operator<< (QDataStream &, const QBitArray &)
	Writes bit array ba to stream out.
Q_CORE_EXPORT QDataStream &	operator>> (QDataStream &, QBitArray &)
	Reads a bit array into ba from stream in.
Q_CORE_EXPORT size_t	qHash (const QBitArray &key, size_t seed) noexcept

Related Symbols
(Note that these are not member symbols.)
QBitArray	operator& (const QBitArray &a1, const QBitArray &a2)
	Returns a bit array that is the AND of the bit arrays a1 and a2.
QBitArray	operator| (const QBitArray &a1, const QBitArray &a2)
	Returns a bit array that is the OR of the bit arrays a1 and a2.
QBitArray	operator^ (const QBitArray &a1, const QBitArray &a2)
	Returns a bit array that is the XOR of the bit arrays a1 and a2.
QDataStream &	operator<< (QDataStream &out, const QBitArray &ba)
	Writes bit array ba to stream out.
QDataStream &	operator>> (QDataStream &in, QBitArray &ba)
	Reads a bit array into ba from stream in.

Detailed Description

\inmodule QtCore

The QBitArray class provides an array of bits.

\reentrant

A QBitArray is an array that gives access to individual bits and provides operators (\l{operator&()}{AND}, \l{operator|()}{OR}, \l{operator^()}{XOR}, and \l{operator~()}{NOT}) that work on entire arrays of bits. It uses \l{implicit sharing} (copy-on-write) to reduce memory usage and to avoid the needless copying of data.

The following code constructs a QBitArray containing 200 bits initialized to false (0):

QBitArray ba(200);

To initialize the bits to true, either pass true as second argument to the constructor, or call fill() later on.

QBitArray uses 0-based indexes, just like C++ arrays. To access the bit at a particular index position, you can use operator[](). On non-const bit arrays, operator[]() returns a reference to a bit that can be used on the left side of an assignment. For example:

QBitArray ba;
ba.resize(3);
ba[0] = true;

For technical reasons, it is more efficient to use testBit() and setBit() to access bits in the array than operator[](). For example:

QBitArray supports {&} (\l{operator&()}{AND}), {|} (\l{operator|()}{OR}), {^} (\l{operator^()}{XOR}), {~} (\l{operator~()}{NOT}), as well as {&=}, {|=}, and {^=}. These operators work in the same way as the built-in C++ bitwise operators of the same name. For example:

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 ]

For historical reasons, QBitArray distinguishes between a null bit array and an empty bit array. A null bit array is a bit array that is initialized using QBitArray's default constructor. An empty bit array is any bit array with size 0. A null bit array is always empty, but an empty bit array isn't necessarily null:

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

All functions except isNull() treat null bit arrays the same as empty bit arrays; for example, QBitArray() compares equal to QBitArray(0). We recommend that you always use isEmpty() and avoid isNull().

See also

QByteArray, QList

Definition at line 12 of file qbitarray.h.

Member Typedef Documentation

DataPtr

QBitArray::DataPtr

Definition at line 73 of file qbitarray.h.

Constructor & Destructor Documentation

QBitArray() [1/4]

QBitArray::QBitArray ( )

inlinenoexcept

Constructs an empty bit array.

See also

isEmpty()

Definition at line 22 of file qbitarray.h.

Referenced by fill().

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QBitArray() [2/4]

QBitArray::QBitArray ( qsizetype  size, bool  value = false  )

explicit

Constructs a bit array containing size bits.

The bits are initialized with value, which defaults to false (0).

Definition at line 111 of file qbitarray.cpp.

References QByteArray::data(), Q_ASSERT_X, and QByteArray::size().

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QBitArray() [3/4]

QBitArray::QBitArray ( const QBitArray &  other )

inlinenoexcept

Constructs a copy of other.

This operation takes \l{constant time}, because QBitArray is \l{implicitly shared}. This makes returning a QBitArray from a function very fast. If a shared instance is modified, it will be copied (copy-on-write), and that takes \l{linear time}.

See also

operator=()

Definition at line 24 of file qbitarray.h.

QBitArray() [4/4]

QBitArray::QBitArray ( QBitArray &&  other )

inlinenoexcept

Move-constructs a QBitArray instance, making it point at the same object that other was pointing to.

Since

5.2

Definition at line 26 of file qbitarray.h.

Member Function Documentation

at()

bool QBitArray::at ( qsizetype  i ) const

inline

Returns the value of the bit at index position i.

i must be a valid index position in the bit array (i.e., 0 <= i < size()).

See also

operator[]()

Definition at line 105 of file qbitarray.h.

References i, and testBit().

Referenced by QTriangulator< T >::ComplexToSimple::decompose(), QTriangulator< T >::SimpleToMonotone::decompose(), and QHeaderViewPrivate::setHiddenSectionsFromBitVector().

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bits()

const char * QBitArray::bits ( ) const

inline

Since

5.11

Returns a pointer to a dense bit array for this QBitArray. Bits are counted upwards from the least significant bit in each byte. The number of bits relevant in the last byte is given by {size() % 8}.

See also

fromBits(), size()

Definition at line 67 of file qbitarray.h.

References d, and nullptr.

clear()

void QBitArray::clear ( )

inline

Clears the contents of the bit array and makes it empty.

See also

resize(), isEmpty()

Definition at line 42 of file qbitarray.h.

References d.

Referenced by QHeaderViewPrivate::clear(), QIconModeViewBase::clear(), and QHeaderViewPrivate::prepareSectionSelected().

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clearBit()

void QBitArray::clearBit ( qsizetype  i )

inline

Sets the bit at index position i to 0.

i must be a valid index position in the bit array (i.e., 0 <= i < size()).

See also

setBit(), toggleBit()

Definition at line 92 of file qbitarray.h.

References d, i, and Q_ASSERT.

Referenced by QRhiVulkan::beginFrame(), QRhiVulkan::endOffscreenFrame(), QLCDNumberPrivate::internalSetString(), and setBit().

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count() [1/2]

qsizetype QBitArray::count ( ) const

inline

Same as size().

Definition at line 32 of file qbitarray.h.

References d.

count() [2/2]

qsizetype QBitArray::count

(

bool

on

)

const

If on is true, this function returns the number of 1-bits stored in the bit array; otherwise the number of 0-bits is returned.

Definition at line 142 of file qbitarray.cpp.

References QByteArray::data(), QByteArray::end(), and qPopulationCount().

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data_ptr()

DataPtr & QBitArray::data_ptr ( )

inline

Definition at line 74 of file qbitarray.h.

References d.

detach()

void QBitArray::detach ( )

inline

Definition at line 40 of file qbitarray.h.

References d.

fill() [1/2]

void QBitArray::fill	(	bool	value,
		qsizetype	begin,
		qsizetype	end
	)

This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.Sets bits at index positions begin up to (but not including) end to value.

begin must be a valid index position in the bit array (0 <= begin < size()).

end must be either a valid index position or equal to size(), in which case the fill operation runs until the end of the array (0 <= end <= size()).

Example:

QBitArray ba(4);
ba.fill(true, 1, 2);            // ba: [ 0, 1, 0, 0 ]
ba.fill(true, 1, 3);            // ba: [ 0, 1, 1, 0 ]
ba.fill(true, 1, 4);            // ba: [ 0, 1, 1, 1 ]

Definition at line 252 of file qbitarray.cpp.

References begin(), QByteArray::data(), and setBit().

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fill() [2/2]

bool QBitArray::fill ( bool  value, qsizetype  size = -1  )

inline

Sets every bit in the bit array to value, returning true if successful; otherwise returns false.

If size is different from -1 (the default), the bit array is resized to size beforehand.

Example:

QBitArray ba(8);
ba.fill(true);
// ba: [ 1, 1, 1, 1, 1, 1, 1, 1 ]
 
ba.fill(false, 2);
// ba: [ 0, 0 ]

See also

resize()

Definition at line 77 of file qbitarray.h.

References QBitArray().

Referenced by QHeaderViewPrivate::prepareSectionSelected(), and QGridLayoutRowData::reset().

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fromBits()

QBitArray QBitArray::fromBits ( const char *  data, qsizetype  size  )

static

Since

5.11

Creates a QBitArray with the dense bit array located at data, with size bits. The byte array at data must be at least size / 8 (rounded up) bytes long.

If size is not a multiple of 8, this function will include the lowest size % 8 bits from the last byte in data.

See also

bits()

Definition at line 290 of file qbitarray.cpp.

References Qt::Uninitialized.

isDetached()

bool QBitArray::isDetached ( ) const

inline

Definition at line 41 of file qbitarray.h.

References d.

isEmpty()

bool QBitArray::isEmpty ( ) const

inline

Returns true if this bit array has size 0; otherwise returns false.

See also

size()

Definition at line 35 of file qbitarray.h.

References d.

isNull()

bool QBitArray::isNull ( ) const

inline

Returns true if this bit array is null; otherwise returns false.

Example:

QBitArray().isNull();           // returns true
QBitArray(0).isNull();          // returns false
QBitArray(3).isNull();          // returns false

Qt makes a distinction between null bit arrays and empty bit arrays for historical reasons. For most applications, what matters is whether or not a bit array contains any data, and this can be determined using isEmpty().

See also

isEmpty()

Definition at line 36 of file qbitarray.h.

References d.

operator!=()

bool QBitArray::operator!= ( const QBitArray &  other ) const

inline

Returns true if other is not equal to this bit array; otherwise returns false.

See also

operator==()

Definition at line 60 of file qbitarray.h.

References d, and other().

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operator&=()

QBitArray & QBitArray::operator&=

(

const QBitArray &

other

)

Performs the AND operation between all bits in this bit array and other.

Assigns the result to this bit array, and returns a reference to it.

The result has the length of the longest of the two bit arrays, with any missing bits (if one array is shorter than the other) taken to be 0.

Example:

QBitArray a(3);
QBitArray b(2);
a[0] = 1; a[1] = 0; a[2] = 1;   // a: [ 1, 0, 1 ]
b[0] = 1; b[1] = 1;             // b: [ 1, 1 ]
a &= b;                         // a: [ 1, 0, 0 ]

See also

operator&(), operator|=(), operator^=(), operator~()

Definition at line 519 of file qbitarray.cpp.

References a1, a2, QByteArray::data(), other(), qMax(), resize(), and QByteArray::size().

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operator=()

QBitArray & QBitArray::operator= ( const QBitArray &  other )

inlinenoexcept

Assigns other to this bit array and returns a reference to this bit array.

Since

5.2

Moves other to this bit array and returns a reference to this bit array.

Definition at line 25 of file qbitarray.h.

References d, and other().

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operator==()

bool QBitArray::operator== ( const QBitArray &  other ) const

inline

Returns true if other is equal to this bit array; otherwise returns false.

See also

operator!=()

Definition at line 59 of file qbitarray.h.

References d, and other().

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operator[]() [1/2]

QBitRef QBitArray::operator[] ( qsizetype  i )

inline

Returns the bit at index position i as a modifiable reference.

i must be a valid index position in the bit array (i.e., 0 <= i < size()).

Example:

QBitArray a(3);
a[0] = false;
a[1] = true;
a[2] = a[0] ^ a[1];

The return value is of type QBitRef, a helper class for QBitArray. When you get an object of type QBitRef, you can assign to it, and the assignment will apply to the bit in the QBitArray from which you got the reference.

The functions testBit(), setBit(), and clearBit() are slightly faster.

See also

at(), testBit(), setBit(), clearBit()

Definition at line 122 of file qbitarray.h.

References i, and Q_ASSERT.

operator[]() [2/2]

bool QBitArray::operator[] ( qsizetype  i ) const

inline

This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.

Definition at line 104 of file qbitarray.h.

References i, and testBit().

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operator^=()

QBitArray & QBitArray::operator^=

(

const QBitArray &

other

)

Performs the XOR operation between all bits in this bit array and other.

Assigns the result to this bit array, and returns a reference to it.

The result has the length of the longest of the two bit arrays, with any missing bits (if one array is shorter than the other) taken to be 0.

Example:

QBitArray a(3);
QBitArray b(2);
a[0] = 1; a[1] = 0; a[2] = 1;   // a: [ 1, 0, 1 ]
b[0] = 1; b[1] = 1;             // b: [ 1, 1 ]
a ^= b;                         // a: [ 0, 1, 1 ]

See also

operator^(), operator&=(), operator|=(), operator~()

Definition at line 574 of file qbitarray.cpp.

References a1, a2, QByteArray::data(), other(), qMax(), and resize().

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operator|=()

QBitArray & QBitArray::operator|=

(

const QBitArray &

other

)

Performs the OR operation between all bits in this bit array and other.

Assigns the result to this bit array, and returns a reference to it.

The result has the length of the longest of the two bit arrays, with any missing bits (if one array is shorter than the other) taken to be 0.

Example:

QBitArray a(3);
QBitArray b(2);
a[0] = 1; a[1] = 0; a[2] = 1;   // a: [ 1, 0, 1 ]
b[0] = 1; b[1] = 1;             // b: [ 1, 1 ]
a |= b;                         // a: [ 1, 1, 1 ]

See also

operator|(), operator&=(), operator^=(), operator~()

Definition at line 548 of file qbitarray.cpp.

References a1, a2, QByteArray::data(), other(), qMax(), and resize().

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operator~()

QBitArray QBitArray::operator~

(

)

const

Returns a bit array that contains the inverted bits of this bit array.

Example:

QBitArray a(3);
QBitArray b;
a[0] = 1; a[1] = 0; a[2] = 1;   // a: [ 1, 0, 1 ]
b = ~a;                         // b: [ 0, 1, 0 ]

See also

operator&(), operator|(), operator^()

Definition at line 595 of file qbitarray.cpp.

References a1, a2, QByteArray::constData(), and QByteArray::size().

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resize()

void QBitArray::resize

(

qsizetype

size

)

Resizes the bit array to size bits.

If size is greater than the current size, the bit array is extended to make it size bits with the extra bits added to the end. The new bits are initialized to false (0).

If size is less than the current size, bits are removed from the end.

See also

size()

Definition at line 184 of file qbitarray.cpp.

References QByteArray::data(), QByteArray::resize(), and QByteArray::size().

Referenced by QAbstractItemModel::decodeData(), QStandardItemModel::dropMimeData(), operator&=(), operator^=(), operator|=(), and QHeaderViewPrivate::sectionsHiddenToBitVector().

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setBit() [1/2]

void QBitArray::setBit ( qsizetype  i )

inline

Sets the bit at index position i to 1.

i must be a valid index position in the bit array (i.e., 0 <= i < size()).

See also

clearBit(), toggleBit()

Definition at line 88 of file qbitarray.h.

References d, i, and Q_ASSERT.

Referenced by addOpaqueDepthPrePassBindings(), QRhiVulkan::beginFrame(), QRhiVulkan::beginOffscreenFrame(), QAbstractItemModel::decodeData(), QTriangulator< T >::ComplexToSimple::decompose(), QTriangulator< T >::SimpleToMonotone::decompose(), QTableViewPrivate::drawAndClipSpans(), QStandardItemModel::dropMimeData(), fill(), QLCDNumberPrivate::internalSetString(), QHeaderViewPrivate::isSectionSelected(), QTableView::paintEvent(), QSSGCustomMaterialSystem::rhiPrepareRenderable(), and setBit().

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setBit() [2/2]

void QBitArray::setBit ( qsizetype  i, bool  val  )

inline

This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.Sets the bit at index position i to value.

Definition at line 96 of file qbitarray.h.

References clearBit(), i, and setBit().

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size()

qsizetype QBitArray::size ( ) const

inline

Returns the number of bits stored in the bit array.

See also

resize()

Definition at line 31 of file qbitarray.h.

References d.

Referenced by QRhiVulkan::beginFrame(), QRhiVulkan::beginOffscreenFrame(), QHeaderViewPrivate::isSectionSelected(), QTableView::paintEvent(), QHeaderViewPrivate::prepareSectionSelected(), and QHeaderViewPrivate::setHiddenSectionsFromBitVector().

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swap()

void QBitArray::swap ( QBitArray &  other )

inlinenoexcept

Since

4.8

Swaps bit array other with this bit array. This operation is very fast and never fails.

Definition at line 29 of file qbitarray.h.

References d, and other().

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testBit()

bool QBitArray::testBit ( qsizetype  i ) const

inline

Returns true if the bit at index position i is 1; otherwise returns false.

i must be a valid index position in the bit array (i.e., 0 <= i < size()).

See also

setBit(), clearBit()

Definition at line 84 of file qbitarray.h.

References d, i, and Q_ASSERT.

Referenced by addOpaqueDepthPrePassBindings(), at(), QRhiVulkan::beginFrame(), QRhiVulkan::beginOffscreenFrame(), QGridLayoutRowData::calculateGeometries(), QAbstractItemModel::decodeData(), QLCDNumberPrivate::drawString(), QStandardItemModel::dropMimeData(), QLCDNumberPrivate::internalSetString(), QHeaderViewPrivate::isSectionSelected(), QBitRef::operator bool(), operator[](), QTableView::paintEvent(), QSSGCustomMaterialSystem::rhiPrepareRenderable(), QLCDNumber::setDigitCount(), QGridLayoutRowData::stealBox(), and QGridLayoutRowData::totalBox().

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toggleBit()

bool QBitArray::toggleBit ( qsizetype  i )

inline

Inverts the value of the bit at index position i, returning the previous value of that bit as either true (if it was set) or false (if it was unset).

If the previous value was 0, the new value will be 1. If the previous value was 1, the new value will be 0.

i must be a valid index position in the bit array (i.e., 0 <= i < size()).

See also

setBit(), clearBit()

Definition at line 99 of file qbitarray.h.

References d, i, and Q_ASSERT.

toUInt32()

quint32 QBitArray::toUInt32 ( QSysInfo::Endian  endianness, bool *  ok = nullptr  ) const

noexcept

Since

6.0

Returns the array of bit converted to an int. The conversion is based on endianness. Converts up to the first 32 bits of the array to quint32 and returns it, obeying endianness. If ok is not a null pointer, and the array has more than 32 bits, ok is set to false and this function returns zero; otherwise, it's set to true.

Definition at line 318 of file qbitarray.cpp.

References i, QSysInfo::LittleEndian, ok, and testBit().

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truncate()

void QBitArray::truncate ( qsizetype  pos )

inline

Truncates the bit array at index position pos.

If pos is beyond the end of the array, nothing happens.

See also

resize()

Definition at line 65 of file qbitarray.h.

References pos, and resize().

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Friends And Related Symbol Documentation

operator&()

QBitArray operator& ( const QBitArray &  a1, const QBitArray &  a2  )

related

Returns a bit array that is the AND of the bit arrays a1 and a2.

The result has the length of the longest of the two bit arrays, with any missing bits (if one array is shorter than the other) taken to be 0.

Example:

QBitArray a(3);
QBitArray b(2);
QBitArray c;
a[0] = 1; a[1] = 0; a[2] = 1;   // a: [ 1, 0, 1 ]
b[0] = 1; b[1] = 1;             // b: [ 1, 1 ]
c = a & b;                      // c: [ 1, 0, 0 ]

See also

{QBitArray::}{operator&=()}, {QBitArray::}{operator|()}, {QBitArray::}{operator^()}

Definition at line 627 of file qbitarray.cpp.

References a1, and a2.

operator<< [1/2]

QDataStream & operator<< ( QDataStream &  out, const QBitArray &  ba  )

friend

Writes bit array ba to stream out.

See also

{Serializing Qt Data Types}{Format of the QDataStream operators}

Definition at line 734 of file qbitarray.cpp.

operator<<() [2/2]

QDataStream & operator<< ( QDataStream &  out, const QBitArray &  ba  )

related

Writes bit array ba to stream out.

See also

{Serializing Qt Data Types}{Format of the QDataStream operators}

Definition at line 734 of file qbitarray.cpp.

operator>> [1/2]

QDataStream & operator>> ( QDataStream &  in, QBitArray &  ba  )

friend

Reads a bit array into ba from stream in.

See also

{Serializing Qt Data Types}{Format of the QDataStream operators}

Definition at line 759 of file qbitarray.cpp.

operator>>() [2/2]

QDataStream & operator>> ( QDataStream &  in, QBitArray &  ba  )

related

Reads a bit array into ba from stream in.

See also

{Serializing Qt Data Types}{Format of the QDataStream operators}

Definition at line 759 of file qbitarray.cpp.

operator^()

QBitArray operator^ ( const QBitArray &  a1, const QBitArray &  a2  )

related

Returns a bit array that is the XOR of the bit arrays a1 and a2.

The result has the length of the longest of the two bit arrays, with any missing bits (if one array is shorter than the other) taken to be 0.

Example:

QBitArray a(3);
QBitArray b(2);
QBitArray c;
a[0] = 1; a[1] = 0; a[2] = 1;   // a: [ 1, 0, 1 ]
b[0] = 1; b[1] = 1;             // b: [ 1, 1 ]
c = a ^ b;                      // c: [ 0, 1, 1 ]

See also

{QBitArray}{operator^=()}, {QBitArray}{operator&()}, {QBitArray}{operator|()}

Definition at line 673 of file qbitarray.cpp.

References a1, and a2.

operator|()

QBitArray operator| ( const QBitArray &  a1, const QBitArray &  a2  )

related

Returns a bit array that is the OR of the bit arrays a1 and a2.

The result has the length of the longest of the two bit arrays, with any missing bits (if one array is shorter than the other) taken to be 0.

Example:

QBitArray a(3);
QBitArray b(2);
QBitArray c;
a[0] = 1; a[1] = 0; a[2] = 1;   // a: [ 1, 0, 1 ]
b[0] = 1; b[1] = 1;             // b: [ 1, 1 ]
c = a | b;                      // c: [ 1, 1, 1 ]

See also

QBitArray::operator|=(), operator&(), operator^()

Definition at line 650 of file qbitarray.cpp.

References a1, and a2.

qHash

Q_CORE_EXPORT size_t qHash ( const QBitArray &  key, size_t  seed  )

friend

Definition at line 966 of file qhash.cpp.

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The documentation for this class was generated from the following files:

• qtbase/src/corelib/tools/qbitarray.h
• qtbase/src/corelib/tools/qbitarray.cpp