src/corelib/kernel/qvariant.cpp

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/****************************************************************************
**
** Copyright (C) 1992-2006 Trolltech ASA. All rights reserved.
**
** This file is part of the QtCore module of the Qt Toolkit.
**
** This file may be used under the terms of the GNU General Public
** License version 2.0 as published by the Free Software Foundation
** and appearing in the file LICENSE.GPL included in the packaging of
** this file.  Please review the following information to ensure GNU
** General Public Licensing requirements will be met:
** http://www.trolltech.com/products/qt/opensource.html
**
** If you are unsure which license is appropriate for your use, please
** review the following information:
** http://www.trolltech.com/products/qt/licensing.html or contact the
** sales department at sales@trolltech.com.
**
** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
**
****************************************************************************/

#include "qvariant.h"
#include "qbitarray.h"
#include "qbytearray.h"
#include "qdatastream.h"
#include "qdebug.h"
#include "qmap.h"
#include "qdatetime.h"
#include "qlist.h"
#include "qstring.h"
#include "qstringlist.h"
#include "qurl.h"
#include "qlocale.h"
#include "private/qvariant_p.h"

#ifndef QT_NO_GEOM_VARIANT
#include "qsize.h"
#include "qpoint.h"
#include "qrect.h"
#include "qline.h"
#endif

#include <float.h>

#ifndef DBL_DIG
#  define DBL_DIG 10
#endif
#ifndef FLT_DIG
#  define FLT_DIG 6
#endif


static const void *constData(const QVariant::Private &d)
{
    switch (d.type) {
    case QVariant::Int:
        return &d.data.i;
    case QVariant::UInt:
        return &d.data.u;
    case QVariant::Bool:
        return &d.data.b;
    case QVariant::LongLong:
        return &d.data.ll;
    case QVariant::ULongLong:
        return &d.data.ull;
    case QVariant::Double:
        return &d.data.d;
    default:
        return d.is_shared ? d.data.shared->ptr : reinterpret_cast<const void *>(&d.data.ptr);
    }
}

static void construct(QVariant::Private *x, const void *copy)
{
    x->is_shared = false;

    switch (x->type) {
    case QVariant::String:
        v_construct<QString>(x, copy);
        break;
    case QVariant::Char:
        v_construct<QChar>(x, copy);
        break;
    case QVariant::StringList:
        v_construct<QStringList>(x, copy);
        break;
    case QVariant::Map:
        v_construct<QVariantMap>(x, copy);
        break;
    case QVariant::List:
        v_construct<QVariantList>(x, copy);
        break;
    case QVariant::Date:
        v_construct<QDate>(x, copy);
        break;
    case QVariant::Time:
        v_construct<QTime>(x, copy);
        break;
    case QVariant::DateTime:
        v_construct<QDateTime>(x, copy);
        break;
    case QVariant::ByteArray:
        v_construct<QByteArray>(x, copy);
        break;
    case QVariant::BitArray:
        v_construct<QBitArray>(x, copy);
        break;
#ifndef QT_NO_GEOM_VARIANT
    case QVariant::Size:
        v_construct<QSize>(x, copy);
        break;
    case QVariant::SizeF:
        v_construct<QSizeF>(x, copy);
        break;
    case QVariant::Rect:
        v_construct<QRect>(x, copy);
        break;
    case QVariant::LineF:
        v_construct<QLineF>(x, copy);
        break;
    case QVariant::Line:
        v_construct<QLine>(x, copy);
        break;
    case QVariant::RectF:
        v_construct<QRectF>(x, copy);
        break;
    case QVariant::Point:
        v_construct<QPoint>(x, copy);
        break;
    case QVariant::PointF:
        v_construct<QPointF>(x, copy);
        break;
#endif
    case QVariant::Url:
        v_construct<QUrl>(x, copy);
        break;
    case QVariant::Locale:
        v_construct<QLocale>(x, copy);
        break;
    case QVariant::RegExp:
        v_construct<QRegExp>(x, copy);
        break;
    case QVariant::Int:
        x->data.i = copy ? *static_cast<const int *>(copy) : 0;
        break;
    case QVariant::UInt:
        x->data.u = copy ? *static_cast<const uint *>(copy) : 0u;
        break;
    case QVariant::Bool:
        x->data.b = copy ? *static_cast<const bool *>(copy) : false;
        break;
    case QVariant::Double:
        x->data.d = copy ? *static_cast<const double*>(copy) : 0.0;
        break;
    case QVariant::LongLong:
        x->data.ll = copy ? *static_cast<const qlonglong *>(copy) : Q_INT64_C(0);
        break;
    case QVariant::ULongLong:
        x->data.ull = copy ? *static_cast<const qulonglong *>(copy) : Q_UINT64_C(0);
        break;
    case QVariant::Invalid:
    case QVariant::UserType:
        break;
    default:
        x->is_shared = true;
        x->data.shared = new QVariant::PrivateShared(QMetaType::construct(x->type, copy));
        if (!x->data.shared->ptr)
             Q_ASSERT_X(x->type > 62, "QVariant::construct()", "Unknown datatype");
        break;
    }
    x->is_null = !copy;
}

static void clear(QVariant::Private *d)
{
    switch (d->type) {
    case QVariant::String:
        v_clear<QString>(d);
        break;
    case QVariant::Char:
        v_clear<QChar>(d);
        break;
    case QVariant::StringList:
        v_clear<QStringList>(d);
        break;
    case QVariant::Map:
        v_clear<QVariantMap>(d);
        break;
    case QVariant::List:
        v_clear<QVariantList>(d);
        break;
    case QVariant::Date:
        v_clear<QDate>(d);
        break;
    case QVariant::Time:
        v_clear<QTime>(d);
        break;
    case QVariant::DateTime:
        v_clear<QDateTime>(d);
        break;
    case QVariant::ByteArray:
        v_clear<QByteArray>(d);
        break;
    case QVariant::BitArray:
        v_clear<QBitArray>(d);
        break;
#ifndef QT_NO_GEOM_VARIANT
    case QVariant::Point:
        v_clear<QPoint>(d);
        break;
    case QVariant::PointF:
        v_clear<QPointF>(d);
        break;
    case QVariant::Size:
        v_clear<QSize>(d);
        break;
    case QVariant::SizeF:
        v_clear<QSizeF>(d);
        break;
    case QVariant::Rect:
        v_clear<QRect>(d);
        break;
    case QVariant::LineF:
        v_clear<QLineF>(d);
        break;
    case QVariant::Line:
        v_clear<QLine>(d);
        break;
    case QVariant::RectF:
        v_clear<QRectF>(d);
        break;
#endif
    case QVariant::Url:
        v_clear<QUrl>(d);
        break;
    case QVariant::Locale:
        v_clear<QLocale>(d);
        break;
    case QVariant::RegExp:
        v_clear<QRegExp>(d);
        break;
    case QVariant::LongLong:
    case QVariant::ULongLong:
    case QVariant::Double:
        break;
    case QVariant::Invalid:
    case QVariant::UserType:
    case QVariant::Int:
    case QVariant::UInt:
    case QVariant::Bool:
        break;
    default:
        QMetaType::destroy(d->type, d->data.shared->ptr);
        delete d->data.shared;
        break;
    }

    d->type = QVariant::Invalid;
    d->is_null = true;
    d->is_shared = false;
}

static bool isNull(const QVariant::Private *d)
{
    switch(d->type) {
    case QVariant::String:
        return v_cast<QString>(d)->isNull();
    case QVariant::Char:
        return v_cast<QChar>(d)->isNull();
    case QVariant::Date:
        return v_cast<QDate>(d)->isNull();
    case QVariant::Time:
        return v_cast<QTime>(d)->isNull();
    case QVariant::DateTime:
        return v_cast<QDateTime>(d)->isNull();
    case QVariant::ByteArray:
        return v_cast<QByteArray>(d)->isNull();
    case QVariant::BitArray:
        return v_cast<QBitArray>(d)->isNull();
#ifndef QT_NO_GEOM_VARIANT
    case QVariant::Size:
        return v_cast<QSize>(d)->isNull();
    case QVariant::SizeF:
        return v_cast<QSizeF>(d)->isNull();
    case QVariant::Rect:
        return v_cast<QRect>(d)->isNull();
    case QVariant::Line:
        return v_cast<QLine>(d)->isNull();
    case QVariant::LineF:
        return v_cast<QLineF>(d)->isNull();
    case QVariant::RectF:
        return v_cast<QRectF>(d)->isNull();
    case QVariant::Point:
        return v_cast<QPoint>(d)->isNull();
    case QVariant::PointF:
        return v_cast<QPointF>(d)->isNull();
#endif
    case QVariant::Url:
    case QVariant::Locale:
    case QVariant::RegExp:
    case QVariant::StringList:
    case QVariant::Map:
    case QVariant::List:
    case QVariant::Invalid:
    case QVariant::UserType:
    case QVariant::Int:
    case QVariant::UInt:
    case QVariant::LongLong:
    case QVariant::ULongLong:
    case QVariant::Bool:
    case QVariant::Double:
        break;
    }
    return d->is_null;
}

static bool compare(const QVariant::Private *a, const QVariant::Private *b)
{
    switch(a->type) {
    case QVariant::List:
        return *v_cast<QVariantList>(a) == *v_cast<QVariantList>(b);
    case QVariant::Map: {
        const QVariantMap *m1 = v_cast<QVariantMap>(a);
        const QVariantMap *m2 = v_cast<QVariantMap>(b);
        if (m1->count() != m2->count())
            return false;
        QVariantMap::ConstIterator it = m1->constBegin();
        QVariantMap::ConstIterator it2 = m2->constBegin();
        while (it != m1->constEnd()) {
            if (*it != *it2)
                return false;
            ++it;
            ++it2;
        }
        return true;
    }
    case QVariant::String:
        return *v_cast<QString>(a) == *v_cast<QString>(b);
    case QVariant::Char:
        return *v_cast<QChar>(a) == *v_cast<QChar>(b);
    case QVariant::StringList:
        return *v_cast<QStringList>(a) == *v_cast<QStringList>(b);
#ifndef QT_NO_GEOM_VARIANT
    case QVariant::Size:
        return *v_cast<QSize>(a) == *v_cast<QSize>(b);
    case QVariant::SizeF:
        return *v_cast<QSizeF>(a) == *v_cast<QSizeF>(b);
    case QVariant::Rect:
        return *v_cast<QRect>(a) == *v_cast<QRect>(b);
    case QVariant::Line:
        return *v_cast<QLine>(a) == *v_cast<QLine>(b);
    case QVariant::LineF:
        return *v_cast<QLineF>(a) == *v_cast<QLineF>(b);
    case QVariant::RectF:
        return *v_cast<QRectF>(a) == *v_cast<QRectF>(b);
    case QVariant::Point:
        return *v_cast<QPoint>(a) == *v_cast<QPoint>(b);
    case QVariant::PointF:
        return *v_cast<QPointF>(a) == *v_cast<QPointF>(b);
#endif
    case QVariant::Url:
        return *v_cast<QUrl>(a) == *v_cast<QUrl>(b);
    case QVariant::Locale:
        return *v_cast<QLocale>(a) == *v_cast<QLocale>(b);
    case QVariant::RegExp:
        return *v_cast<QRegExp>(a) == *v_cast<QRegExp>(b);
    case QVariant::Int:
        return a->data.i == b->data.i;
    case QVariant::UInt:
        return a->data.u == b->data.u;
    case QVariant::LongLong:
        return a->data.ll == b->data.ll;
    case QVariant::ULongLong:
        return a->data.ull == b->data.ull;
    case QVariant::Bool:
        return a->data.b == b->data.b;
    case QVariant::Double:
        return a->data.d == b->data.d;
    case QVariant::Date:
        return *v_cast<QDate>(a) == *v_cast<QDate>(b);
    case QVariant::Time:
        return *v_cast<QTime>(a) == *v_cast<QTime>(b);
    case QVariant::DateTime:
        return *v_cast<QDateTime>(a) == *v_cast<QDateTime>(b);
    case QVariant::ByteArray:
        return *v_cast<QByteArray>(a) == *v_cast<QByteArray>(b);
    case QVariant::BitArray:
        return *v_cast<QBitArray>(a) == *v_cast<QBitArray>(b);
    case QVariant::Invalid:
        return true;
    default:
        break;
    }
    if (!QMetaType::isRegistered(a->type))
        qFatal("QVariant::compare: type %d unknown to QVariant.", a->type);
    return a->data.shared->ptr == b->data.shared->ptr;
}

static qlonglong qMetaTypeNumber(const QVariant::Private *d)
{
    switch (d->type) {
    case QMetaType::Int:
        return d->data.i;
    case QMetaType::LongLong:
        return d->data.ll;
    case QMetaType::Char:
        return qlonglong(*static_cast<signed char *>(d->data.shared->ptr));
    case QMetaType::Short:
        return qlonglong(*static_cast<short *>(d->data.shared->ptr));
    case QMetaType::Long:
        return qlonglong(*static_cast<long *>(d->data.shared->ptr));
    case QMetaType::Float:
        return qRound64(*static_cast<float *>(d->data.shared->ptr));
    case QVariant::Double:
        return qRound64(d->data.d);
    }
    Q_ASSERT(false);
    return 0;
}

static qulonglong qMetaTypeUNumber(const QVariant::Private *d)
{
    switch (d->type) {
    case QVariant::UInt:
        return d->data.u;
    case QVariant::ULongLong:
        return d->data.ull;
    case QMetaType::UChar:
        return qulonglong(*static_cast<unsigned char *>(d->data.shared->ptr));
    case QMetaType::UShort:
        return qulonglong(*static_cast<ushort *>(d->data.shared->ptr));
    case QMetaType::ULong:
        return qulonglong(*static_cast<ulong *>(d->data.shared->ptr));
    }
    Q_ASSERT(false);
    return 0;
}

static qlonglong qConvertToNumber(const QVariant::Private *d, bool *ok)
{
    *ok = true;

    switch (uint(d->type)) {
    case QVariant::String:
        return v_cast<QString>(d)->toLongLong(ok);
    case QVariant::Char:
        return v_cast<QChar>(d)->unicode();
    case QVariant::ByteArray:
        return v_cast<QByteArray>(d)->toLongLong(ok);
    case QVariant::Bool:
        return qlonglong(d->data.b);
    case QVariant::Double:
    case QVariant::Int:
    case QMetaType::Char:
    case QMetaType::Short:
    case QMetaType::Long:
    case QMetaType::Float:
    case QMetaType::LongLong:
        return qMetaTypeNumber(d);
    case QVariant::ULongLong:
    case QVariant::UInt:
    case QMetaType::UChar:
    case QMetaType::UShort:
    case QMetaType::ULong:
        return qlonglong(qMetaTypeUNumber(d));
    }

    *ok = false;
    return Q_INT64_C(0);
}

static qulonglong qConvertToUnsignedNumber(const QVariant::Private *d, bool *ok)
{
    *ok = true;

    switch (uint(d->type)) {
    case QVariant::String:
        return v_cast<QString>(d)->toULongLong(ok);
    case QVariant::Char:
        return v_cast<QChar>(d)->unicode();
    case QVariant::ByteArray:
        return v_cast<QByteArray>(d)->toULongLong(ok);
    case QVariant::Bool:
        return qulonglong(d->data.b);
    case QVariant::Double:
    case QVariant::Int:
    case QMetaType::Char:
    case QMetaType::Short:
    case QMetaType::Long:
    case QMetaType::Float:
    case QMetaType::LongLong:
        return qulonglong(qMetaTypeNumber(d));
    case QVariant::ULongLong:
    case QVariant::UInt:
    case QMetaType::UChar:
    case QMetaType::UShort:
    case QMetaType::ULong:
        return qMetaTypeUNumber(d);
    }

    *ok = false;
    return Q_UINT64_C(0);
}

static bool convert(const QVariant::Private *d, QVariant::Type t, void *result, bool *ok)
{
    Q_ASSERT(d->type != uint(t));

    bool dummy;
    if (!ok)
        ok = &dummy;

    switch (uint(t)) {
    case QVariant::String: {
        QString *str = static_cast<QString *>(result);
        switch (d->type) {
        case QVariant::Char:
            *str = QString(*v_cast<QChar>(d));
            break;
        case QMetaType::Char:
        case QMetaType::UChar:
            *str = QChar::fromAscii(*static_cast<char *>(d->data.shared->ptr));
            break;
        case QMetaType::Short:
        case QMetaType::Long:
        case QVariant::Int:
        case QVariant::LongLong:
            *str = QString::number(qMetaTypeNumber(d));
            break;
        case QVariant::UInt:
        case QVariant::ULongLong:
        case QMetaType::UShort:
        case QMetaType::ULong:
            *str = QString::number(qMetaTypeUNumber(d));
            break;
        case QMetaType::Float:
            *str = QString::number(*static_cast<float *>(d->data.shared->ptr), 'g', FLT_DIG);
            break;
        case QVariant::Double:
            *str = QString::number(d->data.d, 'g', DBL_DIG);
            break;
#if !defined(QT_NO_DATESTRING)
        case QVariant::Date:
            *str = v_cast<QDate>(d)->toString(Qt::ISODate);
            break;
        case QVariant::Time:
            *str = v_cast<QTime>(d)->toString(Qt::ISODate);
            break;
        case QVariant::DateTime:
            *str = v_cast<QDateTime>(d)->toString(Qt::ISODate);
            break;
#endif
        case QVariant::Bool:
            *str = QLatin1String(d->data.b ? "true" : "false");
            break;
        case QVariant::ByteArray:
            *str = QString::fromAscii(v_cast<QByteArray>(d)->constData());
            break;
        case QVariant::StringList:
            if (v_cast<QStringList>(d)->count() == 1)
                *str = v_cast<QStringList>(d)->at(0);
            break;
        default:
            return false;
        }
        break;
    }
    case QVariant::Char: {
        QChar *c = static_cast<QChar *>(result);
        switch (d->type) {
        case QVariant::Int:
        case QVariant::LongLong:
        case QMetaType::Char:
        case QMetaType::Short:
        case QMetaType::Long:
        case QMetaType::Float:
            *c = QChar(ushort(qMetaTypeNumber(d)));
            break;
        case QVariant::UInt:
        case QVariant::ULongLong:
        case QMetaType::UChar:
        case QMetaType::UShort:
        case QMetaType::ULong:
            *c = QChar(ushort(qMetaTypeUNumber(d)));
            break;
        default:
            return false;
        }
        break;
    }
#ifndef QT_NO_GEOM_VARIANT
    case QVariant::Size: {
        QSize *s = static_cast<QSize *>(result);
        switch (d->type) {
        case QVariant::SizeF:
            *s = v_cast<QSizeF>(d)->toSize();
            break;
        default:
            return false;
        }
        break;
    }

    case QVariant::SizeF: {
        QSizeF *s = static_cast<QSizeF *>(result);
        switch (d->type) {
        case QVariant::Size:
            *s = QSizeF(*(v_cast<QSize>(d)));
            break;
        default:
            return false;
        }
        break;
    }

    case QVariant::Line: {
        QLine *s = static_cast<QLine *>(result);
        switch (d->type) {
        case QVariant::LineF:
            *s = v_cast<QLineF>(d)->toLine();
            break;
        default:
            return false;
        }
        break;
    }

    case QVariant::LineF: {
        QLineF *s = static_cast<QLineF *>(result);
        switch (d->type) {
        case QVariant::Line:
            *s = QLineF(*(v_cast<QLine>(d)));
            break;
        default:
            return false;
        }
        break;
    }
#endif
    case QVariant::StringList:
        if (d->type == QVariant::List) {
            QStringList *slst = static_cast<QStringList *>(result);
            const QVariantList *list = v_cast<QVariantList >(d);
            for (int i = 0; i < list->size(); ++i)
                slst->append(list->at(i).toString());
        } else if (d->type == QVariant::String) {
            QStringList *slst = static_cast<QStringList *>(result);
            *slst = QStringList(*v_cast<QString>(d));
        } else {
            return false;
        }
        break;
    case QVariant::Date: {
        QDate *dt = static_cast<QDate *>(result);
        if (d->type == QVariant::DateTime)
            *dt = v_cast<QDateTime>(d)->date();
#ifndef QT_NO_DATESTRING
        else if (d->type == QVariant::String)
            *dt = QDate::fromString(*v_cast<QString>(d), Qt::ISODate);
#endif
        else
            return false;
        break;
    }
    case QVariant::Time: {
        QTime *t = static_cast<QTime *>(result);
        switch (d->type) {
        case QVariant::DateTime:
            *t = v_cast<QDateTime>(d)->time();
            break;
#ifndef QT_NO_DATESTRING
        case QVariant::String:
            *t = QTime::fromString(*v_cast<QString>(d), Qt::ISODate);
            break;
#endif
        default:
            return false;
        }
        break;
    }
    case QVariant::DateTime: {
        QDateTime *dt = static_cast<QDateTime *>(result);
        switch (d->type) {
#ifndef QT_NO_DATESTRING
        case QVariant::String:
            *dt = QDateTime::fromString(*v_cast<QString>(d), Qt::ISODate);
            break;
#endif
        case QVariant::Date:
            *dt = QDateTime(*v_cast<QDate>(d));
            break;
        default:
            return false;
        }
        break;
    }
    case QVariant::ByteArray: {
        QByteArray *ba = static_cast<QByteArray *>(result);
        switch (d->type) {
        case QVariant::String:
            *ba = v_cast<QString>(d)->toAscii();
            break;
        case QVariant::Double:
            *ba = QByteArray::number(d->data.d, 'g', DBL_DIG);
            break;
        case QMetaType::Float:
            *ba = QByteArray::number(*static_cast<float *>(d->data.shared->ptr), 'g', FLT_DIG);
            break;
        case QMetaType::Char:
        case QMetaType::UChar:
            *ba = QByteArray(1, *static_cast<char *>(d->data.shared->ptr));
            break;
        case QVariant::Int:
        case QVariant::LongLong:
        case QMetaType::Short:
        case QMetaType::Long:
            *ba = QByteArray::number(qMetaTypeNumber(d));
            break;
        case QVariant::UInt:
        case QVariant::ULongLong:
        case QMetaType::UShort:
        case QMetaType::ULong:
            *ba = QByteArray::number(qMetaTypeUNumber(d));
            break;
        default:
            return false;
        }
    }
    break;
    case QMetaType::Short:
        *static_cast<short *>(result) = short(qConvertToNumber(d, ok));
        return *ok;
    case QMetaType::Long:
        *static_cast<long *>(result) = long(qConvertToNumber(d, ok));
        return *ok;
    case QMetaType::UShort:
        *static_cast<ushort *>(result) = ushort(qConvertToUnsignedNumber(d, ok));
        return *ok;
    case QMetaType::ULong:
        *static_cast<ulong *>(result) = ulong(qConvertToUnsignedNumber(d, ok));
        return *ok;
    case QVariant::Int:
        *static_cast<int *>(result) = int(qConvertToNumber(d, ok));
        return *ok;
    case QVariant::UInt:
        *static_cast<uint *>(result) = uint(qConvertToUnsignedNumber(d, ok));
        return *ok;
    case QVariant::LongLong:
        *static_cast<qlonglong *>(result) = qConvertToNumber(d, ok);
        return *ok;
    case QVariant::ULongLong: {
        *static_cast<qulonglong *>(result) = qConvertToUnsignedNumber(d, ok);
        return *ok;
    }
    case QVariant::Bool: {
        bool *b = static_cast<bool *>(result);
        switch(d->type) {
        case QVariant::String:
        {
            QString str = v_cast<QString>(d)->toLower();
            *b = !(str == QLatin1String("0") || str == QLatin1String("false") || str.isEmpty());
            break;
        }
        case QVariant::Char:
            *b = !v_cast<QChar>(d)->isNull();
            break;
        case QVariant::Double:
        case QVariant::Int:
        case QVariant::LongLong:
        case QMetaType::Char:
        case QMetaType::Short:
        case QMetaType::Long:
        case QMetaType::Float:
            *b = qMetaTypeNumber(d) != Q_INT64_C(0);
            break;
        case QVariant::UInt:
        case QVariant::ULongLong:
        case QMetaType::UChar:
        case QMetaType::UShort:
        case QMetaType::ULong:
            *b = qMetaTypeUNumber(d) != Q_UINT64_C(0);
            break;
        default:
            *b = false;
            return false;
        }
        break;
    }
    case QVariant::Double: {
        double *f = static_cast<double *>(result);
        switch (d->type) {
        case QVariant::String:
            *f = v_cast<QString>(d)->toDouble(ok);
            break;
        case QVariant::ByteArray:
            *f = v_cast<QByteArray>(d)->toDouble(ok);
            break;
        case QVariant::Bool:
            *f = double(d->data.b);
            break;
        case QMetaType::Float:
            *f = *static_cast<float *>(d->data.shared->ptr);
            break;
        case QVariant::LongLong:
        case QVariant::Int:
        case QMetaType::Char:
        case QMetaType::Short:
        case QMetaType::Long:
            *f = double(qMetaTypeNumber(d));
            break;
        case QVariant::UInt:
        case QVariant::ULongLong:
        case QMetaType::UChar:
        case QMetaType::UShort:
        case QMetaType::ULong:
#if defined(Q_CC_MSVC) && !defined(Q_CC_MSVC_NET)
            *f = (double)(qlonglong)qMetaTypeUNumber(d);
#else
            *f = double(qMetaTypeUNumber(d));
#endif
            break;
        default:
            *f = 0.0;
            return false;
        }
        break;
    }
    case QMetaType::Float: {
        float *f = static_cast<float *>(result);
        switch (d->type) {
        case QVariant::String:
            *f = float(v_cast<QString>(d)->toDouble(ok));
            break;
        case QVariant::ByteArray:
            *f = float(v_cast<QByteArray>(d)->toDouble(ok));
            break;
        case QVariant::Bool:
            *f = float(d->data.b);
            break;
        case QVariant::Double:
            *f = float(d->data.d);
            break;
        case QVariant::LongLong:
        case QVariant::Int:
        case QMetaType::Char:
        case QMetaType::Short:
        case QMetaType::Long:
            *f = float(qMetaTypeNumber(d));
            break;
        case QVariant::UInt:
        case QVariant::ULongLong:
        case QMetaType::UChar:
        case QMetaType::UShort:
        case QMetaType::ULong:
#if defined(Q_CC_MSVC) && !defined(Q_CC_MSVC_NET)
            *f = (float)(qlonglong)qMetaTypeUNumber(d);
#else
            *f = float(qMetaTypeUNumber(d));
#endif
            break;
        default:
            *f = 0.0f;
            return false;
        }
        break;
    }
    case QVariant::List:
        if (d->type == QVariant::StringList) {
            QVariantList *lst = static_cast<QVariantList *>(result);
            const QStringList *slist = v_cast<QStringList>(d);
            for (int i = 0; i < slist->size(); ++i)
                lst->append(QVariant(slist->at(i)));
        } else if (qstrcmp(QMetaType::typeName(d->type), "QList<QVariant>") == 0) {
            *static_cast<QVariantList *>(result) =
                *static_cast<QList<QVariant> *>(d->data.shared->ptr);
        } else {
            return false;
        }
        break;
    case QVariant::Map:
        if (qstrcmp(QMetaType::typeName(d->type), "QMap<QString, QVariant>") == 0) {
            *static_cast<QVariantMap *>(result) =
                *static_cast<QMap<QString, QVariant> *>(d->data.shared->ptr);
        } else {
            return false;
        }
        break;
#ifndef QT_NO_GEOM_VARIANT
    case QVariant::Rect:
        if (d->type == QVariant::RectF)
            *static_cast<QRect *>(result) = (v_cast<QRectF>(d))->toRect();
        else
            return false;
        break;
    case QVariant::RectF:
        if (d->type == QVariant::Rect)
            *static_cast<QRectF *>(result) = *v_cast<QRect>(d);
        else
            return false;
        break;
    case QVariant::PointF:
        if (d->type == QVariant::Point)
            *static_cast<QPointF *>(result) = *v_cast<QPoint>(d);
        else
            return false;
        break;
    case QVariant::Point:
        if (d->type == QVariant::PointF)
            *static_cast<QPoint *>(result) = (v_cast<QPointF>(d))->toPoint();
        else
            return false;
        break;
#endif
    default:
        return false;
    }
    return true;
}

#if !defined(QT_NO_DEBUG_STREAM) && !defined(Q_BROKEN_DEBUG_STREAM)
static void streamDebug(QDebug dbg, const QVariant &v)
{
    switch (v.type()) {
    case QVariant::Int:
        dbg.nospace() << v.toInt();
        break;
    case QVariant::UInt:
        dbg.nospace() << v.toUInt();
        break;
    case QVariant::LongLong:
        dbg.nospace() << v.toLongLong();
        break;
    case QVariant::ULongLong:
        dbg.nospace() << v.toULongLong();
        break;
    case QVariant::Double:
        dbg.nospace() << v.toDouble();
        break;
    case QVariant::Bool:
        dbg.nospace() << v.toBool();
        break;
    case QVariant::String:
        dbg.nospace() << v.toString();
        break;
    case QVariant::Char:
        dbg.nospace() << v.toChar();
        break;
    case QVariant::StringList:
        dbg.nospace() << v.toStringList();
        break;
    case QVariant::Map:
        dbg.nospace() << v.toMap();
        break;
    case QVariant::List:
        dbg.nospace() << v.toList();
        break;
    case QVariant::Date:
        dbg.nospace() << v.toDate();
        break;
    case QVariant::Time:
        dbg.nospace() << v.toTime();
        break;
    case QVariant::DateTime:
        dbg.nospace() << v.toDateTime();
        break;
    case QVariant::ByteArray:
        dbg.nospace() << v.toByteArray();
        break;
    case QVariant::Url:
        dbg.nospace() << v.toUrl();
        break;
#ifndef QT_NO_GEOM_VARIANT
    case QVariant::Point:
        dbg.nospace() << v.toPoint();
        break;
    case QVariant::PointF:
        dbg.nospace() << v.toPointF();
        break;
    case QVariant::Rect:
        dbg.nospace() << v.toRect();
        break;
    case QVariant::Size:
        dbg.nospace() << v.toSize();
        break;
    case QVariant::SizeF:
        dbg.nospace() << v.toSizeF();
        break;
    case QVariant::Line:
        dbg.nospace() << v.toLine();
        break;
    case QVariant::LineF:
        dbg.nospace() << v.toLineF();
        break;
    case QVariant::RectF:
        dbg.nospace() << v.toRectF();
        break;
#endif
    case QVariant::BitArray:
        //dbg.nospace() << v.toBitArray();
        break;
    default:
        break;
    }
}
#endif

const QVariant::Handler qt_kernel_variant_handler = {
    construct,
    clear,
    isNull,
#ifndef QT_NO_DATASTREAM
    0,
    0,
#endif
    compare,
    convert,
    0,
#if !defined(QT_NO_DEBUG_STREAM) && !defined(Q_BROKEN_DEBUG_STREAM)
    streamDebug
#else
    0
#endif
};

Q_CORE_EXPORT const QVariant::Handler *qcoreVariantHandler()
{
    return &qt_kernel_variant_handler;
}


const QVariant::Handler *QVariant::handler = &qt_kernel_variant_handler;

void QVariant::create(int type, const void *copy)
{
    d.type = type;
    handler->construct(&d, copy);
}

QVariant::~QVariant()
{
    if (d.type > Char && (!d.is_shared || !d.data.shared->ref.deref()))
        handler->clear(&d);
}

QVariant::QVariant(const QVariant &p)
    : d(p.d)
{
    if (d.is_shared) {
        d.data.shared->ref.ref();
    } else if (p.d.type > Char) {
        handler->construct(&d, p.constData());
        d.is_null = p.d.is_null;
    }
}

#ifndef QT_NO_DATASTREAM

QVariant::QVariant(QDataStream &s)
{
    d.is_null = true;
    s >> *this;
}
#endif //QT_NO_DATASTREAM

QVariant::QVariant(const char *val)
{
    QString s = QString::fromAscii(val);
    create(String, &s);
}

QVariant::QVariant(Type type)
{ create(type, 0); }
QVariant::QVariant(int typeOrUserType, const void *copy)
{ create(typeOrUserType, copy); d.is_null = false; }
QVariant::QVariant(int val)
{ d.is_null = false; d.type = Int; d.data.i = val; }
QVariant::QVariant(uint val)
{ d.is_null = false; d.type = UInt; d.data.u = val; }
QVariant::QVariant(qlonglong val)
{ d.is_null = false; d.type = LongLong; d.data.ll = val; }
QVariant::QVariant(qulonglong val)
{ d.is_null = false; d.type = ULongLong; d.data.ull = val; }
QVariant::QVariant(bool val)
{ d.is_null = false; d.type = Bool; d.data.b = val; }
QVariant::QVariant(double val)
{ d.is_null = false; d.type = Double; d.data.d = val; }

QVariant::QVariant(const QByteArray &val)
{ create(ByteArray, &val); }
QVariant::QVariant(const QBitArray &val)
{ create(BitArray, &val); }
QVariant::QVariant(const QString &val)
{ create(String, &val); }
QVariant::QVariant(const QChar &val)
{ create (Char, &val); }
QVariant::QVariant(const QLatin1String &val)
{ QString str(val); create(String, &str); }
QVariant::QVariant(const QStringList &val)
{ create(StringList, &val); }

QVariant::QVariant(const QDate &val)
{ create(Date, &val); }
QVariant::QVariant(const QTime &val)
{ create(Time, &val); }
QVariant::QVariant(const QDateTime &val)
{ create(DateTime, &val); }
QVariant::QVariant(const QList<QVariant> &list)
{ create(List, &list); }
QVariant::QVariant(const QMap<QString, QVariant> &map)
{ create(Map, &map); }
#ifndef QT_NO_GEOM_VARIANT
QVariant::QVariant(const QPoint &pt) { create(Point, &pt); }
QVariant::QVariant(const QPointF &pt) { create (PointF, &pt); }
QVariant::QVariant(const QRectF &r) { create (RectF, &r); }
QVariant::QVariant(const QLineF &l) { create (LineF, &l); }
QVariant::QVariant(const QLine &l) { create (Line, &l); }
QVariant::QVariant(const QRect &r) { create(Rect, &r); }
QVariant::QVariant(const QSize &s) { create(Size, &s); }
QVariant::QVariant(const QSizeF &s) { create(SizeF, &s); }
#endif
QVariant::QVariant(const QUrl &u) { create(Url, &u); }
QVariant::QVariant(const QLocale &l) { create(Locale, &l); }
QVariant::QVariant(const QRegExp &regExp) { create(RegExp, &regExp); }
QVariant::QVariant(Qt::GlobalColor color) { create(62, &color); }

QVariant::Type QVariant::type() const
{
    return d.type >= QMetaType::User ? UserType : static_cast<Type>(d.type);
}

int QVariant::userType() const
{
    return d.type;
}

QVariant& QVariant::operator=(const QVariant &variant)
{
    if (this == &variant)
        return *this;

    clear();
    if (variant.d.is_shared) {
        variant.d.data.shared->ref.ref();
        d = variant.d;
    } else if (variant.d.type > Char) {
        d.type = variant.d.type;
        handler->construct(&d, variant.constData());
        d.is_null = variant.d.is_null;
    } else {
        d = variant.d;
    }

    return *this;
}

void QVariant::detach()
{
    if (!d.is_shared || d.data.shared->ref == 1)
        return;

    Private dd;
    dd.type = d.type;
    handler->construct(&dd, constData());
    dd.data.shared = qAtomicSetPtr(&d.data.shared, dd.data.shared);
    if (!dd.data.shared->ref.deref())
        handler->clear(&dd);
}

const char *QVariant::typeName() const
{
    return typeToName(Type(d.type));
}

void QVariant::clear()
{
    if (!d.is_shared || !d.data.shared->ref.deref())
        handler->clear(&d);
    d.type = Invalid;
    d.is_null = true;
    d.is_shared = false;
}

const char *QVariant::typeToName(Type typ)
{
    if (typ == Invalid)
        return 0;
    if (typ == UserType)
        return "UserType";

    return QMetaType::typeName(typ);
}


QVariant::Type QVariant::nameToType(const char *name)
{
    if (!name || !*name)
        return Invalid;
    if (strcmp(name, "Q3CString") == 0)
        return ByteArray;
    if (strcmp(name, "Q_LLONG") == 0)
        return LongLong;
    if (strcmp(name, "Q_ULLONG") == 0)
        return ULongLong;
    if (strcmp(name, "QIconSet") == 0)
        return Icon;
    if (strcmp(name, "UserType") == 0)
        return UserType;

    int metaType = QMetaType::type(name);
    return metaType <= int(LastGuiType) ? QVariant::Type(metaType) : UserType;
}

#ifndef QT_NO_DATASTREAM
enum { MapFromThreeCount = 35 };
static const uint map_from_three[MapFromThreeCount] =
{
    QVariant::Invalid,
    QVariant::Map,
    QVariant::List,
    QVariant::String,
    QVariant::StringList,
    QVariant::Font,
    QVariant::Pixmap,
    QVariant::Brush,
    QVariant::Rect,
    QVariant::Size,
    QVariant::Color,
    QVariant::Palette,
    63, // ColorGroup
    QVariant::Icon,
    QVariant::Point,
    QVariant::Image,
    QVariant::Int,
    QVariant::UInt,
    QVariant::Bool,
    QVariant::Double,
    QVariant::ByteArray,
    QVariant::Polygon,
    QVariant::Region,
    QVariant::Bitmap,
    QVariant::Cursor,
    QVariant::SizePolicy,
    QVariant::Date,
    QVariant::Time,
    QVariant::DateTime,
    QVariant::ByteArray,
    QVariant::BitArray,
    QVariant::KeySequence,
    QVariant::Pen,
    QVariant::LongLong,
    QVariant::ULongLong
};

void QVariant::load(QDataStream &s)
{
    clear();

    quint32 u;
    s >> u;
    if (s.version() < QDataStream::Qt_4_0) {
        if (u >= MapFromThreeCount)
            return;
        u = map_from_three[u];
    }
    qint8 is_null = false;
    if (s.version() >= QDataStream::Qt_4_2)
        s >> is_null;
    if (u >= QVariant::UserType) {
        QByteArray name;
        s >> name;
        u = QMetaType::type(name);
        if (!u)
            qFatal("QVariant::load(QDataStream &s): type %s unknown to QVariant.", name.data());
    }
    create(static_cast<int>(u), 0);
    d.is_null = is_null;

    if (d.type == QVariant::Invalid) {
        // Since we wrote something, we should read something
        QString x;
        s >> x;
        d.is_null = true;
        return;
    }

    // const cast is save since we operate on a newly constructed variant
    if (!QMetaType::load(s, d.type, const_cast<void *>(::constData(d)))) {
        Q_ASSERT_X(false, "QVariant::load", "Invalid type to load");
        qWarning("QVariant::load: unable to load type %d.", d.type);
    }
}

void QVariant::save(QDataStream &s) const
{
    quint32 tp = type();
    if (s.version() < QDataStream::Qt_4_0) {
        int i;
        for (i = 0; i < MapFromThreeCount; ++i) {
            if (map_from_three[i] == tp) {
                tp = i;
                break;
            }
        }
        if (i == MapFromThreeCount) {
            s << QVariant();
            return;
        }
    }
    s << tp;
    if (s.version() >= QDataStream::Qt_4_2)
        s << qint8(d.is_null);
    if (tp == QVariant::UserType) {
        s << QMetaType::typeName(userType());
    }

    if (d.type == QVariant::Invalid) {
        s << QString();
        return;
    }

    if (!QMetaType::save(s, d.type, ::constData(d))) {
        Q_ASSERT_X(false, "QVariant::save", "Invalid type to save");
        qWarning("QVariant::save: unable to save type %d.", d.type);
    }
}

QDataStream& operator>>(QDataStream &s, QVariant &p)
{
    p.load(s);
    return s;
}

QDataStream& operator<<(QDataStream &s, const QVariant &p)
{
    p.save(s);
    return s;
}

QDataStream& operator>>(QDataStream &s, QVariant::Type &p)
{
    quint32 u;
    s >> u;
    p = (QVariant::Type)u;

    return s;
}

QDataStream& operator<<(QDataStream &s, const QVariant::Type p)
{
    s << static_cast<quint32>(p);

    return s;
}

#endif //QT_NO_DATASTREAM

template <typename T>
inline T qVariantToHelper(const QVariant::Private &d, QVariant::Type t,
                          const QVariant::Handler *handler, T * = 0)
{
    if (d.type == t)
        return *v_cast<T>(&d);

    T ret;
    handler->convert(&d, t, &ret, 0);
    return ret;
}

QStringList QVariant::toStringList() const
{
    return qVariantToHelper<QStringList>(d, StringList, handler);
}

QString QVariant::toString() const
{
    return qVariantToHelper<QString>(d, String, handler);
}

QVariantMap QVariant::toMap() const
{
    return qVariantToHelper<QVariantMap>(d, Map, handler);
}

QDate QVariant::toDate() const
{
    return qVariantToHelper<QDate>(d, Date, handler);
}

QTime QVariant::toTime() const
{
    return qVariantToHelper<QTime>(d, Time, handler);
}

QDateTime QVariant::toDateTime() const
{
    return qVariantToHelper<QDateTime>(d, DateTime, handler);
}

QByteArray QVariant::toByteArray() const
{
    return qVariantToHelper<QByteArray>(d, ByteArray, handler);
}

#ifndef QT_NO_GEOM_VARIANT

QPoint QVariant::toPoint() const
{
    return qVariantToHelper<QPoint>(d, Point, handler);
}

QRect QVariant::toRect() const
{
    return qVariantToHelper<QRect>(d, Rect, handler);
}

QSize QVariant::toSize() const
{
    return qVariantToHelper<QSize>(d, Size, handler);
}

QSizeF QVariant::toSizeF() const
{
    return qVariantToHelper<QSizeF>(d, SizeF, handler);
}

QRectF QVariant::toRectF() const
{
    return qVariantToHelper<QRectF>(d, RectF, handler);
}

QLineF QVariant::toLineF() const
{
    return qVariantToHelper<QLineF>(d, LineF, handler);
}

QLine QVariant::toLine() const
{
    return qVariantToHelper<QLine>(d, Line, handler);
}

QPointF QVariant::toPointF() const
{
    return qVariantToHelper<QPointF>(d, PointF, handler);
}

#endif // QT_NO_GEOM_VARIANT

QUrl QVariant::toUrl() const
{
    return qVariantToHelper<QUrl>(d, Url, handler);
}

QLocale QVariant::toLocale() const
{
    return qVariantToHelper<QLocale>(d, Locale, handler);
}

QRegExp QVariant::toRegExp() const
{
    return qVariantToHelper<QRegExp>(d, RegExp, handler);
}

QChar QVariant::toChar() const
{
    return qVariantToHelper<QChar>(d, Char, handler);
}

QBitArray QVariant::toBitArray() const
{
    return qVariantToHelper<QBitArray>(d, BitArray, handler);
}

template <typename T>
inline T qNumVariantToHelper(const QVariant::Private &d, QVariant::Type t,
                             const QVariant::Handler *handler, bool *ok, const T& val)
{
    if (ok)
        *ok = true;
    if (d.type == t)
        return val;

    T ret;
    if (!handler->convert(&d, t, &ret, ok) && ok)
        *ok = false;
    return ret;
}

int QVariant::toInt(bool *ok) const
{
    return qNumVariantToHelper<int>(d, Int, handler, ok, d.data.i);
}

uint QVariant::toUInt(bool *ok) const
{
    return qNumVariantToHelper<uint>(d, UInt, handler, ok, d.data.u);
}

qlonglong QVariant::toLongLong(bool *ok) const
{
    return qNumVariantToHelper<qlonglong>(d, LongLong, handler, ok, d.data.ll);
}

qulonglong QVariant::toULongLong(bool *ok) const
{
    return qNumVariantToHelper<qulonglong>(d, ULongLong, handler, ok, d.data.ull);
}

bool QVariant::toBool() const
{
    if (d.type == Bool)
        return d.data.b;

    bool res = false;
    handler->convert(&d, Bool, &res, 0);

    return res;
}

double QVariant::toDouble(bool *ok) const
{
    return qNumVariantToHelper<double>(d, Double, handler, ok, d.data.d);
}

QVariantList QVariant::toList() const
{
    return qVariantToHelper<QVariantList>(d, List, handler);
}

static const quint32 qCanConvertMatrix[QVariant::LastCoreType + 1] =
{
/*Invalid*/     0,

/*Bool*/          1 << QVariant::Double     | 1 << QVariant::Int        | 1 << QVariant::UInt
                | 1 << QVariant::LongLong   | 1 << QVariant::ULongLong
                | 1 << QVariant::String     | 1 << QVariant::Char,

/*Int*/           1 << QVariant::UInt       | 1 << QVariant::String     | 1 << QVariant::Double
                | 1 << QVariant::Bool       | 1 << QVariant::LongLong   | 1 << QVariant::ULongLong
                | 1 << QVariant::Char       | 1 << QVariant::ByteArray,

/*UInt*/          1 << QVariant::Int        | 1 << QVariant::String     | 1 << QVariant::Double
                | 1 << QVariant::Bool       | 1 << QVariant::LongLong   | 1 << QVariant::ULongLong
                | 1 << QVariant::Char       | 1 << QVariant::ByteArray,

/*LLong*/         1 << QVariant::Int        | 1 << QVariant::String     | 1 << QVariant::Double
                | 1 << QVariant::Bool       | 1 << QVariant::UInt       | 1 << QVariant::ULongLong
                | 1 << QVariant::Char       | 1 << QVariant::ByteArray,

/*ULlong*/        1 << QVariant::Int        | 1 << QVariant::String     | 1 << QVariant::Double
                | 1 << QVariant::Bool       | 1 << QVariant::UInt       | 1 << QVariant::LongLong
                | 1 << QVariant::Char       | 1 << QVariant::ByteArray,

/*double*/        1 << QVariant::Int        | 1 << QVariant::String     | 1 << QVariant::ULongLong
                | 1 << QVariant::Bool       | 1 << QVariant::UInt       | 1 << QVariant::LongLong
                | 1 << QVariant::ByteArray,

/*QChar*/         1 << QVariant::Int        | 1 << QVariant::UInt       | 1 << QVariant::LongLong
                | 1 << QVariant::ULongLong,

/*QMap*/          0,

/*QList*/         1 << QVariant::StringList,

/*QString*/       1 << QVariant::StringList | 1 << QVariant::ByteArray  | 1 << QVariant::Int
                | 1 << QVariant::UInt       | 1 << QVariant::Bool       | 1 << QVariant::Double
                | 1 << QVariant::Date       | 1 << QVariant::Time       | 1 << QVariant::DateTime
                | 1 << QVariant::LongLong   | 1 << QVariant::ULongLong  | 1 << QVariant::Char,

/*QStringList*/   1 << QVariant::List       | 1 << QVariant::String,

/*QByteArray*/    1 << QVariant::String     | 1 << QVariant::Int        | 1 << QVariant::UInt
                | 1 << QVariant::Double     | 1 << QVariant::LongLong   | 1 << QVariant::ULongLong,

/*QBitArray*/     0,

/*QDate*/         1 << QVariant::String     | 1 << QVariant::DateTime,

/*QTime*/         1 << QVariant::String     | 1 << QVariant::DateTime,

/*QDateTime*/     1 << QVariant::String     | 1 << QVariant::Date,

/*QUrl*/          0,

/*QLocale*/       0,

/*QRect*/         1 << QVariant::RectF,

/*QRectF*/        1 << QVariant::Rect,

/*QSize*/         1 << QVariant::SizeF,

/*QSizeF*/        1 << QVariant::Size,

/*QLine*/         1 << QVariant::LineF,

/*QLineF*/        1 << QVariant::Line,

/*QPoint*/        1 << QVariant::PointF,

/*QPointF*/       1 << QVariant::Point,

/*QRegExp*/       0

};

bool QVariant::canConvert(Type t) const
{
    if (d.type == uint(t))
        return true;

    if (d.type > QVariant::LastCoreType || t > QVariant::LastCoreType) {
        switch (uint(t)) {
        case QVariant::Int:
            return d.type == QVariant::KeySequence;
        case QVariant::Image:
            return d.type == QVariant::Pixmap || d.type == QVariant::Bitmap;
        case QVariant::Pixmap:
            return d.type == QVariant::Image || d.type == QVariant::Bitmap
                              || d.type == QVariant::Brush;
        case QVariant::Bitmap:
            return d.type == QVariant::Pixmap || d.type == QVariant::Image;
        case QVariant::ByteArray:
            return d.type == QVariant::Color;
        case QVariant::String:
            return d.type == QVariant::KeySequence || d.type == QVariant::Font
                              || d.type == QVariant::Color;
        case QVariant::KeySequence:
            return d.type == QVariant::String || d.type == QVariant::Int;
        case QVariant::Font:
            return d.type == QVariant::String;
        case QVariant::Color:
            return d.type == QVariant::String || d.type == QVariant::ByteArray
                              || d.type == QVariant::Brush;
        case QVariant::Brush:
            return d.type == QVariant::Color || d.type == QVariant::Pixmap;
        case QMetaType::Char:
        case QMetaType::UChar:
        case QMetaType::Long:
        case QMetaType::ULong:
        case QMetaType::Short:
        case QMetaType::UShort:
        case QMetaType::Float:
            return qCanConvertMatrix[QVariant::Int] & (1 << d.type) || d.type == QVariant::Int;
        default:
            return false;
        }
    }

    return qCanConvertMatrix[t] & (1 << d.type);
}

bool QVariant::convert(Type t)
{
    if (d.type == uint(t))
        return true;

    QVariant oldValue = *this;

    clear();
    if (!oldValue.canConvert(t))
        return false;

    create(t, 0);
    if (oldValue.isNull())
        return false;

    bool isOk = true;
    if (!handler->convert(&oldValue.d, t, data(), &isOk))
        isOk = false;
    d.is_null = !isOk;
    return isOk;
}

static bool qIsNumericType(uint tp)
{
    return (tp >= QVariant::Bool && tp <= QVariant::Double)
           || (tp >= QMetaType::Long && tp <= QMetaType::Float);
}

static bool qIsFloatingPoint(uint tp)
{
    return tp == QVariant::Double || tp == QMetaType::Float;
}

bool QVariant::cmp(const QVariant &v) const
{
    QVariant v2 = v;
    if (d.type != v2.d.type) {
        if (qIsNumericType(d.type) && qIsNumericType(v.d.type)) {
            if (qIsFloatingPoint(d.type) || qIsFloatingPoint(v.d.type))
                return qFuzzyCompare(toDouble(), v.toDouble());
            else
                return toLongLong() == v.toLongLong();
        }
        if (!v2.canConvert(Type(d.type)) || !v2.convert(Type(d.type)))
            return false;
    }
    return handler->compare(&d, &v2.d);
}

const void *QVariant::constData() const
{
    return ::constData(d);
}

void* QVariant::data()
{
    detach();
    return const_cast<void *>(::constData(d));
}


#ifdef QT3_SUPPORT

void *QVariant::castOrDetach(Type t)
{
    if (d.type != uint(t)) {
        if (!convert(t))
            create(t, 0);
    } else {
        detach();
    }
    return data();
}
#endif

bool QVariant::isNull() const
{
    return handler->isNull(&d);
}

#ifndef QT_NO_DEBUG_STREAM
QDebug operator<<(QDebug dbg, const QVariant &v)
{
#ifndef Q_BROKEN_DEBUG_STREAM
    dbg.nospace() << "QVariant(" << v.typeName() << ", ";
    QVariant::handler->debugStream(dbg, v);
    dbg.nospace() << ')';
    return dbg.space();
#else
    qWarning("This compiler doesn't support streaming QVariant to QDebug");
    return dbg;
    Q_UNUSED(v);
#endif
}

QDebug operator<<(QDebug dbg, const QVariant::Type p)
{
#ifndef Q_BROKEN_DEBUG_STREAM
    dbg.nospace() << "QVariant::" << QVariant::typeToName(p);
    return dbg.space();
#else
    qWarning("This compiler doesn't support streaming QVariant::Type to QDebug");
    return dbg;
    Q_UNUSED(p);
#endif
}
#endif

---