Sorting QList<QMap<QString , qreal > >

[amiref]

Hi
I have a container in this form : QList<QMap<QString , qreal > > myContainer .
How can I sort this QList according to qreal ?

[Zlatomir]

Which qreal? Since each QMap (form the QList) can have many qreal values? Tell us what are you trying to do so that we can give some advice about that.

[leon.anavi]

Hi,

Use "qSort":http://doc.qt.nokia.com/4.7.1/qtalgorithms.html#qSort or "qStableSort":http://doc.qt.nokia.com/4.7.1/qtalgorithms.html#qStableSort from "Qt Generic Algorithms":http://doc.qt.nokia.com/qq/qq15-qalgorithms.html

Best regards,
Leon

[giesbert]

[quote author="leon.anavi" date="1304771691"]Hi,
Use "qSort":http://doc.qt.nokia.com/4.7.1/qtalgorithms.html#qSort or "qStableSort":http://doc.qt.nokia.com/4.7.1/qtalgorithms.html#qStableSort from "Qt Generic Algorithms":http://doc.qt.nokia.com/qq/qq15-qalgorithms.html
Best regards,
Leon[/quote]

On which base should he sort?

he has a

@

class MyContainer : QMap<QString , qreal>{};

QList<MyContainer>;
@

To use qSort, MyContainer needs a less then operator.

[Zlatomir]

He can use the "qSort(...)":http://doc.qt.nokia.com/4.7.1/qtalgorithms.html#qSort-2 overload that takes an less-than function.

But i have a feeling that he wants something different - because i can't imagine what criteria he wants to use to sort a vector of maps - this is why i asked more information.

[leon.anavi]

[quote author="Gerolf" date="1304772427"]
On which base should he sort?

he has a

@

class MyContainer : QMap<QString , qreal>{};

QList<MyContainer>;
@

To use qSort, MyContainer needs a less then operator.

[/quote]

Hi Gerolf,

I have no idea what is the exact goal as the combination of QMap and QList is a bit strange for sorting :)

@
void qSort ( RandomAccessIterator begin, RandomAccessIterator end, LessThan lessThan )
@

Can't he use custom lessThan method which compares QMap<QString , qreal > in a desired way (whatever it is) and fits his needs?

amiref, please provide more details as suggested by Zlatomir

Thanks,
Leon

[giesbert]

[quote author="leon.anavi" date="1304773869"]
Hi Gerolf,
I have no idea what is the exact goal as the combination of QMap and QList is a bit strange for sorting :)

@
void qSort ( RandomAccessIterator begin, RandomAccessIterator end, LessThan lessThan )
@

Can't he use custom lessThan method which compares QMap<QString , qreal > in a desired way (whatever it is) and fits his needs?
amiref, please provide more details as suggested by Zlatomir
[/quote]

Yes, he can, that's right. But I'm looking for the logic on sorting a list of qmaps....