qmetatype.cpp

奇趣公司比较新的qt/emd版本

#endif

    QWriteLocker locker(customTypesLock());
    static int currentIdx = User;
    int idx = qMetaTypeType_unlocked(normalizedTypeName);

    if (!idx) {
        idx = currentIdx++;
        ct->resize(ct->count() + 1);
        QCustomTypeInfo &inf = (*ct)[idx - User];
        inf.typeName = normalizedTypeName;
        inf.constr = constructor;
        inf.destr = destructor;
    }
    return idx;
}

/*!
    Returns true if the datatype with ID \a type is registered;
    otherwise returns false.

    \sa type(), typeName(), Type
*/
bool QMetaType::isRegistered(int type)
{
    if (type >= 0 && type < User) {
        // predefined type
        return true;
    }
    QReadLocker locker(customTypesLock());
    const QVector<QCustomTypeInfo> * const ct = customTypes();
    return ((type >= User) && (ct && ct->count() > type - User));
}

/*!
    Returns a handle to the type called \a typeName, or 0 if there is
    no such type.

    \sa isRegistered(), typeName(), Type
*/
int QMetaType::type(const char *typeName)
{
#ifdef QT_NO_QOBJECT
    const ::QByteArray normalizedTypeName = typeName;
#else
    const ::QByteArray normalizedTypeName = QMetaObject::normalizedType(typeName);
#endif

    QReadLocker locker(customTypesLock());
    return qMetaTypeType_unlocked(normalizedTypeName);
}

#ifndef QT_NO_DATASTREAM
/*!
    Writes the object pointed to by \a data with the ID \a type to
    the given \a stream. Returns true if the object is saved
    successfully; otherwise returns false.

    The type must have been registered with qRegisterMetaType() and
    qRegisterMetaTypeStreamOperators() beforehand.

    Normally, you should not need to call this function directly.
    Instead, use QVariant's \c operator<<(), which relies on save()
    to stream custom types.

    \sa load(), qRegisterMetaTypeStreamOperators()
*/
bool QMetaType::save(QDataStream &stream, int type, const void *data)
{
    if (!data || !isRegistered(type))
        return false;

    switch(type) {
    case QMetaType::Void:
    case QMetaType::VoidStar:
    case QMetaType::QObjectStar:
    case QMetaType::QWidgetStar:
        return false;
    case QMetaType::Long:
        stream << qlonglong(*static_cast<const long *>(data));
        break;
    case QMetaType::Int:
        stream << *static_cast<const int *>(data);
        break;
    case QMetaType::Short:
        stream << *static_cast<const short *>(data);
        break;
    case QMetaType::Char:
        // force a char to be signed
        stream << *static_cast<const signed char *>(data);
        break;
    case QMetaType::ULong:
        stream << qulonglong(*static_cast<const ulong *>(data));
        break;
    case QMetaType::UInt:
        stream << *static_cast<const uint *>(data);
        break;
    case QMetaType::LongLong:
        stream << *static_cast<const qlonglong *>(data);
        break;
    case QMetaType::ULongLong:
        stream << *static_cast<const qulonglong *>(data);
        break;
    case QMetaType::UShort:
        stream << *static_cast<const ushort *>(data);
        break;
    case QMetaType::UChar:
        stream << *static_cast<const uchar *>(data);
        break;
    case QMetaType::Bool:
        stream << qint8(*static_cast<const bool *>(data));
        break;
    case QMetaType::Float:
        stream << *static_cast<const float *>(data);
        break;
    case QMetaType::Double:
        stream << *static_cast<const double *>(data);
        break;
    case QMetaType::QChar:
        stream << *static_cast<const ::QChar *>(data);
        break;
#ifndef QT_BOOTSTRAPPED
    case QMetaType::QVariantMap:
        stream << *static_cast<const ::QVariantMap *>(data);
        break;
    case QMetaType::QVariantList:
        stream << *static_cast<const ::QVariantList *>(data);
        break;
#endif
    case QMetaType::QByteArray:
        stream << *static_cast<const ::QByteArray *>(data);
        break;
    case QMetaType::QString:
        stream << *static_cast<const ::QString *>(data);
        break;
    case QMetaType::QStringList:
        stream << *static_cast<const ::QStringList *>(data);
        break;
#ifndef QT_BOOTSTRAPPED
    case QMetaType::QBitArray:
        stream << *static_cast<const ::QBitArray *>(data);
        break;
#endif
    case QMetaType::QDate:
        stream << *static_cast<const ::QDate *>(data);
        break;
    case QMetaType::QTime:
        stream << *static_cast<const ::QTime *>(data);
        break;
    case QMetaType::QDateTime:
        stream << *static_cast<const ::QDateTime *>(data);
        break;
#ifndef QT_BOOTSTRAPPED
    case QMetaType::QUrl:
        stream << *static_cast<const ::QUrl *>(data);
        break;
#endif
    case QMetaType::QLocale:
        stream << *static_cast<const ::QLocale *>(data);
        break;
#ifndef QT_NO_GEOM_VARIANT
    case QMetaType::QRect:
        stream << *static_cast<const ::QRect *>(data);
        break;
    case QMetaType::QRectF:
        stream << *static_cast<const ::QRectF *>(data);
        break;
    case QMetaType::QSize:
        stream << *static_cast<const ::QSize *>(data);
        break;
    case QMetaType::QSizeF:
        stream << *static_cast<const ::QSizeF *>(data);
        break;
    case QMetaType::QLine:
        stream << *static_cast<const ::QLine *>(data);
        break;
    case QMetaType::QLineF:
        stream << *static_cast<const ::QLineF *>(data);
        break;
    case QMetaType::QPoint:
        stream << *static_cast<const ::QPoint *>(data);
        break;
    case QMetaType::QPointF:
        stream << *static_cast<const ::QPointF *>(data);
        break;
#endif
#ifndef QT_NO_REGEXP
    case QMetaType::QRegExp:
        stream << *static_cast<const ::QRegExp *>(data);
        break;
#endif
#ifdef QT3_SUPPORT
    case QMetaType::QColorGroup:
#endif
    case QMetaType::QFont:
    case QMetaType::QPixmap:
    case QMetaType::QBrush:
    case QMetaType::QColor:
    case QMetaType::QPalette:
    case QMetaType::QIcon:
    case QMetaType::QImage:
    case QMetaType::QPolygon:
    case QMetaType::QRegion:
    case QMetaType::QBitmap:
    case QMetaType::QCursor:
    case QMetaType::QSizePolicy:
    case QMetaType::QKeySequence:
    case QMetaType::QPen:
    case QMetaType::QTextLength:
    case QMetaType::QTextFormat:
    case QMetaType::QMatrix:
    case QMetaType::QTransform:
        if (!qMetaTypeGuiHelper)
            return false;
        qMetaTypeGuiHelper[type - FirstGuiType].saveOp(stream, data);
        break;
    default: {
        const QVector<QCustomTypeInfo> * const ct = customTypes();
        if (!ct)
            return false;

        SaveOperator saveOp = 0;
        {
            QReadLocker locker(customTypesLock());
            saveOp = ct->at(type - User).saveOp;
        }

        if (!saveOp)
            return false;
        saveOp(stream, data);
        break; }
    }

    return true;
}

/*!
    Reads the object of the specified \a type from the given \a
    stream into \a data. Returns true if the object is loaded
    successfully; otherwise returns false.

    The type must have been registered with qRegisterMetaType() and
    qRegisterMetaTypeStreamOperators() beforehand.

    Normally, you should not need to call this function directly.
    Instead, use QVariant's \c operator>>(), which relies on load()
    to stream custom types.

    \sa save(), qRegisterMetaTypeStreamOperators()
*/
bool QMetaType::load(QDataStream &stream, int type, void *data)
{
    if (!data || !isRegistered(type))
        return false;

    switch(type) {
    case QMetaType::Void:
    case QMetaType::VoidStar:
    case QMetaType::QObjectStar:
    case QMetaType::QWidgetStar:
        return false;
    case QMetaType::Long: {
        qlonglong l;
        stream >> l;
        *static_cast<long *>(data) = long(l);
        break; }
    case QMetaType::Int:
        stream >> *static_cast<int *>(data);
        break;
    case QMetaType::Short:
        stream >> *static_cast<short *>(data);
        break;
    case QMetaType::Char:
        // force a char to be signed
        stream >> *static_cast<signed char *>(data);
        break;
    case QMetaType::ULong: {
        qulonglong ul;
        stream >> ul;
        *static_cast<ulong *>(data) = ulong(ul);
        break; }
    case QMetaType::UInt:
        stream >> *static_cast<uint *>(data);
        break;
    case QMetaType::LongLong:
        stream >> *static_cast<qlonglong *>(data);
        break;
    case QMetaType::ULongLong:
        stream >> *static_cast<qulonglong *>(data);
        break;
    case QMetaType::UShort:
        stream >> *static_cast<ushort *>(data);
        break;
    case QMetaType::UChar:
        stream >> *static_cast<uchar *>(data);
        break;
    case QMetaType::Bool: {
        qint8 b;
        stream >> b;
        *static_cast<bool *>(data) = b;
        break; }
    case QMetaType::Float:
        stream >> *static_cast<float *>(data);
        break;
    case QMetaType::Double:
        stream >> *static_cast<double *>(data);
        break;
    case QMetaType::QChar:
        stream >> *static_cast< ::QChar *>(data);
        break;
#ifndef QT_BOOTSTRAPPED
    case QMetaType::QVariantMap:
        stream >> *static_cast< ::QVariantMap *>(data);
        break;
    case QMetaType::QVariantList:
        stream >> *static_cast< ::QVariantList *>(data);
        break;
#endif
    case QMetaType::QByteArray:
        stream >> *static_cast< ::QByteArray *>(data);
        break;
    case QMetaType::QString:
        stream >> *static_cast< ::QString *>(data);
        break;
    case QMetaType::QStringList:
        stream >> *static_cast< ::QStringList *>(data);
        break;
#ifndef QT_BOOTSTRAPPED
    case QMetaType::QBitArray:
        stream >> *static_cast< ::QBitArray *>(data);
        break;
#endif
    case QMetaType::QDate:
        stream >> *static_cast< ::QDate *>(data);
        break;
    case QMetaType::QTime:
        stream >> *static_cast< ::QTime *>(data);
        break;
    case QMetaType::QDateTime:
        stream >> *static_cast< ::QDateTime *>(data);
        break;
#ifndef QT_BOOTSTRAPPED
    case QMetaType::QUrl:
        stream >> *static_cast< ::QUrl *>(data);
        break;
#endif
    case QMetaType::QLocale:
        stream >> *static_cast< ::QLocale *>(data);
        break;
#ifndef QT_NO_GEOM_VARIANT
    case QMetaType::QRect:
        stream >> *static_cast< ::QRect *>(data);
        break;
    case QMetaType::QRectF:
        stream >> *static_cast< ::QRectF *>(data);
        break;
    case QMetaType::QSize:
        stream >> *static_cast< ::QSize *>(data);
        break;
    case QMetaType::QSizeF:
        stream >> *static_cast< ::QSizeF *>(data);
        break;
    case QMetaType::QLine:
        stream >> *static_cast< ::QLine *>(data);
        break;
    case QMetaType::QLineF:
        stream >> *static_cast< ::QLineF *>(data);
        break;
    case QMetaType::QPoint:
        stream >> *static_cast< ::QPoint *>(data);
        break;
    case QMetaType::QPointF:
        stream >> *static_cast< ::QPointF *>(data);
        break;
#endif
#ifndef QT_NO_REGEXP
    case QMetaType::QRegExp:
        stream >> *static_cast< ::QRegExp *>(data);
        break;
#endif
#ifdef QT3_SUPPORT
    case QMetaType::QColorGroup:
#endif
    case QMetaType::QFont:
    case QMetaType::QPixmap:
    case QMetaType::QBrush:
    case QMetaType::QColor:
    case QMetaType::QPalette:
    case QMetaType::QIcon:
    case QMetaType::QImage:
    case QMetaType::QPolygon:
    case QMetaType::QRegion:
    case QMetaType::QBitmap:
    case QMetaType::QCursor:
    case QMetaType::QSizePolicy:
    case QMetaType::QKeySequence:
    case QMetaType::QPen:
    case QMetaType::QTextLength:
    case QMetaType::QTextFormat:
    case QMetaType::QMatrix:
    case QMetaType::QTransform:
        if (!qMetaTypeGuiHelper)
            return false;
        qMetaTypeGuiHelper[type - FirstGuiType].loadOp(stream, data);
        break;
    default: {
        const QVector<QCustomTypeInfo> * const ct = customTypes();
        if (!ct)
            return false;

        LoadOperator loadOp = 0;
        {
            QReadLocker locker(customTypesLock());
            loadOp = ct->at(type - User).loadOp;
        }

        if (!loadOp)
            return false;
        loadOp(stream, data);
        break; }
    }
    return true;
}
#endif

/*!
    Returns a copy of \a copy, assuming it is of type \a type. If \a
    copy is zero, creates a default type.

    \sa destroy(), isRegistered(), Type
*/
void *QMetaType::construct(int type, const void *copy)
{
    if (copy) {
        switch(type) {
        case QMetaType::VoidStar:
        case QMetaType::QObjectStar:
        case QMetaType::QWidgetStar:
            return new void *(*static_cast<void* const *>(copy));
        case QMetaType::Long:
            return new long(*static_cast<const long*>(copy));
        case QMetaType::Int:
            return new int(*static_cast<const int*>(copy));
        case QMetaType::Short: