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** rights. These rights are described in the Nokia Qt LGPL Exception | |
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** GNU General Public License Usage | |
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****************************************************************************/ | |
#ifndef QBITFIELD_P_H | |
#define QBITFIELD_P_H | |
// | |
// W A R N I N G | |
// ------------- | |
// | |
// This file is not part of the Qt API. It exists purely as an | |
// implementation detail. This header file may change from version to | |
// version without notice, or even be removed. | |
// | |
// We mean it. | |
// | |
#include <QtCore/qglobal.h> | |
QT_BEGIN_NAMESPACE | |
class QBitField | |
{ | |
public: | |
inline QBitField(); | |
inline QBitField(const quint32 *, int bits); | |
inline QBitField(const QBitField &); | |
inline ~QBitField(); | |
inline QBitField &operator=(const QBitField &); | |
inline quint32 size() const; | |
inline QBitField united(const QBitField &); | |
inline bool testBit(int) const; | |
private: | |
quint32 bits:31; | |
quint32 *ownData; | |
const quint32 *data; | |
}; | |
QBitField::QBitField() | |
: bits(0), ownData(0), data(0) | |
{ | |
} | |
QBitField::QBitField(const quint32 *bitData, int bitCount) | |
: bits((quint32)bitCount), ownData(0), data(bitData) | |
{ | |
} | |
QBitField::QBitField(const QBitField &other) | |
: bits(other.bits), ownData(other.ownData), data(other.data) | |
{ | |
if (ownData) | |
++(*ownData); | |
} | |
QBitField::~QBitField() | |
{ | |
if (ownData) | |
if(0 == --(*ownData)) delete [] ownData; | |
} | |
QBitField &QBitField::operator=(const QBitField &other) | |
{ | |
if (other.data == data) | |
return *this; | |
if (ownData) | |
if(0 == --(*ownData)) delete [] ownData; | |
bits = other.bits; | |
ownData = other.ownData; | |
data = other.data; | |
if (ownData) | |
++(*ownData); | |
return *this; | |
} | |
inline quint32 QBitField::size() const | |
{ | |
return bits; | |
} | |
QBitField QBitField::united(const QBitField &o) | |
{ | |
if (o.bits == 0) { | |
return *this; | |
} else if (bits == 0) { | |
return o; | |
} else { | |
int max = (bits > o.bits)?bits:o.bits; | |
int length = (max + 31) / 32; | |
QBitField rv; | |
rv.bits = max; | |
rv.ownData = new quint32[length + 1]; | |
*(rv.ownData) = 1; | |
rv.data = rv.ownData + 1; | |
if (bits > o.bits) { | |
::memcpy((quint32 *)rv.data, data, length * sizeof(quint32)); | |
for (quint32 ii = 0; ii < (o.bits + quint32(31)) / 32; ++ii) | |
((quint32 *)rv.data)[ii] |= o.data[ii]; | |
} else { | |
::memcpy((quint32 *)rv.data, o.data, length * sizeof(quint32)); | |
for (quint32 ii = 0; ii < (bits + quint32(31)) / 32; ++ii) | |
((quint32 *)rv.data)[ii] |= data[ii]; | |
} | |
return rv; | |
} | |
} | |
bool QBitField::testBit(int b) const | |
{ | |
Q_ASSERT(b >= 0); | |
if ((quint32)b < bits) { | |
return data[b / 32] & (1 << (b % 32)); | |
} else { | |
return false; | |
} | |
} | |
QT_END_NAMESPACE | |
#endif // QBITFIELD_P_H |