problems with QtConcurrent

Hi guys I want to use QtConcurrent, but there are problems:

Code:

---

class Data
{
private:
    QString data;
    float value;
 
public:
    Data(QString data,float value);
 
    inline QString getData() const { return data; }
 
    bool dateFiltering(const OfferData& d);
};

---

Qt Concurrent example

Code:

---

QList<Data> data = datamanager.getData();
 
    //filter data 
    QtConcurrent::filter(data,&Data::dateFiltering);

---

errors:
/opt/QtSDK/Desktop/Qt/4.8.1/gcc/include/QtCore/qtconcurrentfilterkernel.h:109: Fehler:no match for call to '(QtConcurrent::MemberFunctionWrapper1<bool, Data, const Data&>) (const Data&)'
/opt/QtSDK/Desktop/Qt/4.8.1/gcc/include/QtCore/qtconcurrentfunctionwrappers.h:128: candidate is:
/opt/QtSDK/Desktop/Qt/4.8.1/gcc/include/QtCore/qtconcurrentfunctionwrappers.h:138: T QtConcurrent::MemberFunctionWrapper1<T, C, U>::operator()(C&, U) [with T = bool, C = Data, U = const Data&]

maybe somebody knows, whats wrong...thanks