qvariant.h

qt-x11-opensource-src-4.1.4.tar.gz源码

    typedef bool (*f_compare)(const Private *, const Private *);
    typedef bool (*f_convert)(const QVariant::Private *d, Type t, void *, bool *);
    typedef bool (*f_canConvert)(const QVariant::Private *d, Type t);
    typedef void (*f_debugStream)(QDebug, const QVariant &);
    struct Handler {
        f_construct construct;
        f_clear clear;
        f_null isNull;
#ifndef QT_NO_DATASTREAM
        f_load load;
        f_save save;
#endif
        f_compare compare;
        f_convert convert;
        f_canConvert canConvert;
        f_debugStream debugStream;
    };
#endif

    inline bool operator==(const QVariant &v) const
    { return cmp(v); }
    inline bool operator!=(const QVariant &v) const
    { return !cmp(v); }

protected:
    friend inline bool qvariant_cast_helper(const QVariant &, QVariant::Type, void *);
    friend int qRegisterGuiVariant();
    friend inline bool operator==(const QVariant &, const QVariantComparisonHelper &);
#ifndef QT_NO_DEBUG_STREAM
    friend Q_CORE_EXPORT QDebug operator<<(QDebug, const QVariant &);
#endif
    Private d;

#ifndef QT_MOC
    static const Handler *handler;
#endif

    void create(int type, const void *copy);
#ifdef QT3_SUPPORT
    void *castOrDetach(Type t);
#endif
    bool cmp(const QVariant &other) const;

private:
#ifdef QT_NO_CAST_FROM_ASCII
    // force compile error when implicit conversion is not wanted
    inline QVariant(const char *) { Q_ASSERT(false); }
#endif
#ifndef QT3_SUPPORT
    // force compile error, prevent QVariant(QVariant::Type, int) to be called
    inline QVariant(bool, int) { Q_ASSERT(false); }
#endif
};

#ifndef QT_MOC
typedef QList<QVariant> QVariantList;
typedef QMap<QString, QVariant> QVariantMap;

inline bool qvariant_cast_helper(const QVariant &v, QVariant::Type tp, void *ptr)
{ return QVariant::handler->convert(&v.d, tp, ptr, 0); }

template <typename T>
inline int qt_variant_metatype_id(T *)
{ return QMetaTypeId<T>::qt_metatype_id(); }

template<>
inline int qt_variant_metatype_id(QVariantMap *) { return QVariant::Map; }
template<>
inline int qt_variant_metatype_id(QVariantList *) { return QVariant::List; }
template<>
inline int qt_variant_metatype_id(QStringList *) { return QVariant::StringList; }
class QFont;
template<>
inline int qt_variant_metatype_id(QFont *) { return QVariant::Font; }
class QPixmap;
template<>
inline int qt_variant_metatype_id(QPixmap *) { return QVariant::Pixmap; }
class QBrush;
template<>
inline int qt_variant_metatype_id(QBrush *) { return QVariant::Brush; }
template<>
inline int qt_variant_metatype_id(QRect *) { return QVariant::Rect; }
template<>
inline int qt_variant_metatype_id(QSize *) { return QVariant::Size; }
template<>
inline int qt_variant_metatype_id(QSizeF *) { return QVariant::SizeF; }
class QColor;
template<>
inline int qt_variant_metatype_id(QColor *) { return QVariant::Color; }
class QPalette;
template<>
inline int qt_variant_metatype_id(QPalette *) { return QVariant::Palette; }
class QIcon;
template<>
inline int qt_variant_metatype_id(QIcon *) { return QVariant::Icon; }
class QPoint;
template<>
inline int qt_variant_metatype_id(QPoint *) { return QVariant::Point; }
class QPointF;
template<>
inline int qt_variant_metatype_id(QPointF *) { return QVariant::PointF; }
class QImage;
template<>
inline int qt_variant_metatype_id(QImage*) { return QVariant::Image; }
class QPolygon;
template<>
inline int qt_variant_metatype_id(QPolygon *) { return QVariant::Polygon; }
class QRegion;
template<>
inline int qt_variant_metatype_id(QRegion *) { return QVariant::Region; }
class QBitmap;
template<>
inline int qt_variant_metatype_id(QBitmap *) { return QVariant::Bitmap; }
class QCursor;
template<>
inline int qt_variant_metatype_id(QCursor *) { return QVariant::Cursor; }
class QSizePolicy;
template<>
inline int qt_variant_metatype_id(QSizePolicy *) { return QVariant::SizePolicy; }
template<>
inline int qt_variant_metatype_id(QDate *) { return QVariant::Date; }
template<>
inline int qt_variant_metatype_id(QTime *) { return QVariant::Time; }
template<>
inline int qt_variant_metatype_id(QDateTime *) { return QVariant::DateTime; }
template<>
inline int qt_variant_metatype_id(QBitArray *) { return QVariant::BitArray; }
class QKeySequence;
template<>
inline int qt_variant_metatype_id(QKeySequence *) { return QVariant::KeySequence; }
class QPen;
template<>
inline int qt_variant_metatype_id(QPen *) { return QVariant::Pen; }
template<>
inline int qt_variant_metatype_id(qlonglong *) { return QVariant::LongLong; }
template<>
inline int qt_variant_metatype_id(qulonglong *) { return QVariant::ULongLong; }
template<>
inline int qt_variant_metatype_id(QUrl *) { return QVariant::Url; }
class QTextLength;
template<>
inline int qt_variant_metatype_id(QTextLength *) { return QVariant::TextLength; }
class QTextFormat;
template<>
inline int qt_variant_metatype_id(QTextFormat *) { return QVariant::TextFormat; }
template<>
inline int qt_variant_metatype_id(QLocale *) { return QVariant::Locale; }
template<>
inline int qt_variant_metatype_id(QRegExp *) { return QVariant::RegExp; }
template<>
inline int qt_variant_metatype_id(QLineF *) { return QVariant::LineF; }
template<>
inline int qt_variant_metatype_id(QLine *) { return QVariant::Line; }
template<>
inline int qt_variant_metatype_id(QRectF *) { return QVariant::RectF; }
#ifdef QT3_SUPPORT
class QColorGroup;
template<>
inline int qt_variant_metatype_id(QColorGroup *) { return QVariant::ColorGroup; }
#endif

template <typename T>
inline QVariant qVariantFromValue(const T &t)
{
    return QVariant(qt_variant_metatype_id<T>(reinterpret_cast<T *>(0)), &t);
}

template <>
inline QVariant qVariantFromValue(const QVariant &t) { return t; }

template <typename T>
inline void qVariantSetValue(QVariant &v, const T &t)
{
    v = QVariant(qt_variant_metatype_id<T>(reinterpret_cast<T *>(0)), &t);
}
#endif

inline QVariant::QVariant() {}
inline bool QVariant::isValid() const { return d.type != Invalid; }

#ifdef QT3_SUPPORT
inline int &QVariant::asInt()
{ return *reinterpret_cast<int *>(castOrDetach(Int)); }
inline uint &QVariant::asUInt()
{ return *reinterpret_cast<uint *>(castOrDetach(UInt)); }
inline qlonglong &QVariant::asLongLong()
{ return *reinterpret_cast<qlonglong *>(castOrDetach(LongLong)); }
inline qulonglong &QVariant::asULongLong()
{ return *reinterpret_cast<qulonglong *>(castOrDetach(ULongLong)); }
inline bool &QVariant::asBool()
{ return *reinterpret_cast<bool *>(castOrDetach(Bool)); }
inline double &QVariant::asDouble()
{ return *reinterpret_cast<double *>(castOrDetach(Double)); }
inline QByteArray& QVariant::asByteArray()
{ return *reinterpret_cast<QByteArray *>(castOrDetach(ByteArray)); }
inline QBitArray& QVariant::asBitArray()
{ return *reinterpret_cast<QBitArray *>(castOrDetach(BitArray)); }
inline QString& QVariant::asString()
{ return *reinterpret_cast<QString *>(castOrDetach(String)); }
inline QStringList& QVariant::asStringList()
{ return *reinterpret_cast<QStringList *>(castOrDetach(StringList)); }
inline QDate& QVariant::asDate()
{ return *reinterpret_cast<QDate *>(castOrDetach(Date)); }
inline QTime& QVariant::asTime()
{ return *reinterpret_cast<QTime *>(castOrDetach(Time)); }
inline QDateTime& QVariant::asDateTime()
{ return *reinterpret_cast<QDateTime *>(castOrDetach(DateTime)); }
inline QList<QVariant>& QVariant::asList()
{ return *reinterpret_cast<QList<QVariant> *>(castOrDetach(List)); }
inline QMap<QString, QVariant>& QVariant::asMap()
{ return *reinterpret_cast<QMap<QString, QVariant> *>(castOrDetach(Map)); }
inline QPoint &QVariant::asPoint()
{ return *reinterpret_cast<QPoint *>(castOrDetach(Point)); }
inline QRect &QVariant::asRect()
{ return *reinterpret_cast<QRect *>(castOrDetach(Rect)); }
inline QSize &QVariant::asSize()
{ return *reinterpret_cast<QSize *>(castOrDetach(Size)); }
#endif //QT3_SUPPORT

#ifndef QT_NO_MEMBER_TEMPLATES
template<typename T>
inline void QVariant::setValue(const T &avalue)
{ qVariantSetValue(*this, avalue); }
#endif

#ifndef QT_NO_DATASTREAM
Q_CORE_EXPORT QDataStream& operator>> (QDataStream& s, QVariant& p);
Q_CORE_EXPORT QDataStream& operator<< (QDataStream& s, const QVariant& p);
Q_CORE_EXPORT QDataStream& operator>> (QDataStream& s, QVariant::Type& p);
Q_CORE_EXPORT QDataStream& operator<< (QDataStream& s, const QVariant::Type p);
#endif

inline bool QVariant::isDetached() const
{ return !d.is_shared || d.data.shared->ref == 1; }


#ifdef qdoc
    inline bool operator==(const QVariant &v1, const QVariant &v2);
    inline bool operator!=(const QVariant &v1, const QVariant &v2);
#else

/* Helper class to add one more level of indirection to prevent
   implicit casts.
*/
class QVariantComparisonHelper
{
public:
    inline QVariantComparisonHelper(const QVariant &var)
        : v(&var) {}
private:
    friend inline bool operator==(const QVariant &, const QVariantComparisonHelper &);
    const QVariant *v;
};

inline bool operator==(const QVariant &v1, const QVariantComparisonHelper &v2)
{
    return v1.cmp(*v2.v);
}

inline bool operator!=(const QVariant &v1, const QVariantComparisonHelper &v2)
{
    return !operator==(v1, v2);
}
#endif

#ifndef QT_MOC
#if !defined qdoc && defined Q_CC_MSVC && _MSC_VER < 1300

template<typename T> T qvariant_cast(const QVariant &v, T * = 0)
{
    const int vid = qt_variant_metatype_id<T>(static_cast<T *>(0));
    if (vid == v.userType())
        return *reinterpret_cast<const T *>(v.constData());
    if (vid < int(QVariant::UserType)) {
        T t;
        qvariant_cast_helper(v, QVariant::Type(vid), &t);
        return t;
    }
    return T();
}

template<typename T>
inline T qVariantValue(const QVariant &variant, T *t = 0)
{ return qvariant_cast<T>(variant, t); }

template<typename T>
inline bool qVariantCanConvert(const QVariant &variant, T *t = 0)
{
    return variant.canConvert(static_cast<QVariant::Type>(qt_variant_metatype_id<T>(t)));
}
#else

template<typename T> T qvariant_cast(const QVariant &v)
{
    const int vid = qt_variant_metatype_id<T>(static_cast<T *>(0));
    if (vid == v.userType())
        return *reinterpret_cast<const T *>(v.constData());
    if (vid < int(QVariant::UserType)) {
        T t;
        qvariant_cast_helper(v, QVariant::Type(vid), &t);
        return t;
    }
    return T();
}

template<typename T>
inline T qVariantValue(const QVariant &variant)
{ return qvariant_cast<T>(variant); }

template<typename T>
inline bool qVariantCanConvert(const QVariant &variant)
{
    return variant.canConvert(static_cast<QVariant::Type>(
                qt_variant_metatype_id<T>(static_cast<T *>(0))));
}
#endif
#endif
Q_DECLARE_SHARED(QVariant)
Q_DECLARE_TYPEINFO(QVariant, Q_MOVABLE_TYPE);

#ifndef QT_NO_DEBUG_STREAM
Q_CORE_EXPORT QDebug operator<<(QDebug, const QVariant &);
Q_CORE_EXPORT QDebug operator<<(QDebug, const QVariant::Type);
#endif

QT_END_HEADER

#endif // QVARIANT_H