QtConcurrent::mappedReduced

[wookoon]

QStringList PaltUnit::dayMap(QStringList s)
{
    ......
}
 
void PaltUnit:upReduce(QStringList &res,QStringList s)
{
    ......
}
 
QStringList PaltUnit::solutionPick()
{
    QVector<QStringList> vec;
 
    vec = divStockData(DIVIDEDAYS);
 
    QFuture<QStringList> res = QtConcurrent::mappedReduced<QStringList>(vec, dayMap, upReduce);
 
    return res;
}

QStringList PaltUnit::dayMap(QStringList s)
{
    ......
}

void PaltUnit:upReduce(QStringList &res,QStringList s)
{
    ......
}

QStringList PaltUnit::solutionPick()
{
    QVector<QStringList> vec;

    vec = divStockData(DIVIDEDAYS);

    QFuture<QStringList> res = QtConcurrent::mappedReduced<QStringList>(vec, dayMap, upReduce);
   
    return res;
}

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the buildissues will show : argument of type 'QStringList(PaltUnit::*)(QStringList)' does not match 'QStringList(PaltUnit::*)(QStringList)' ï¼›
QStringList(PaltUnit::*)(QStringList) is not a class,struct, or union type

If I made "dayMap" and "upReduce" to be globe function, then will build pass. Why..?

So If I want made "dayMap" and "upReduce" still be the member functions of the PaltUnit, what should I do?