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....