[PySide] [shiboken]how to make shiboken implement pure virtual function?

[机械唯物主义 : linjunhalida]

ok, still my pysideqwt project, I'm wrapping QwtData,
in QwtData: http://qwt.sourceforge.net/qwt__data_8h-source.html

00047 class QWT_EXPORT QwtData
00048 {
00049 public:
00050     QwtData();
00051     virtual ~QwtData();
00052
00054     virtual QwtData *copy() const = 0;
00055
00057     virtual size_t size() const = 0;
00058
00064     virtual double x(size_t i) const = 0;
00070     virtual double y(size_t i) const = 0;
00071
00072     virtual QwtDoubleRect boundingRect() const;
00073
00074 protected:
00078     QwtData &operator=(const QwtData &);
00079 };

and xml typesystem:

  <object-type name="QwtData">
  </object-type>

and qwtdata_wrapper:

class QwtDataWrapper : public QwtData
{
public:
    QwtDataWrapper();
    virtual QRectF boundingRect() const;
    virtual QwtData * copy() const;
    virtual ~QwtDataWrapper();
};

didn't implement those pure virtual function, what's wrong?
or should I send more information?
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