[Interest] How to make the QString "10" behind "9" in QMap's key order

[mail at herrdiel.de]

Hi,

you need a "lessThan"-function, tailored for your needs. An example from 
me is this:

boolPerson::lessThanFamilyFirst(QSharedPointer<Person>p1,QSharedPointer<Person>p2) 


{

return(QString::localeAwareCompare(p1->familyName(),p2->familyName())<0)

||((p1->familyName()==p2->familyName())

&&(QString::localeAwareCompare(p1->firstName(),p2->firstName())<0));

}

Now you can pass this as a functor to a sort method like this:

std::stable_sort(pupils.begin(),pupils.end(),Person::lessThanFamilyFirst);

Please notice, that there are no () when calling the lessThan functor.

HTH
Sebastian


Am 07.01.2018 um 09:01 schrieb jack ma:
> Hi,
>
> there is a QMap<QString,QGraphicsItem *> type, then insert values with：
>
> type.insert("U1",nullptr),
> type.insert("U2",nullptr),
> …………
> type.insert("U9",nullptr),
> type.insert("U10",nullptr),
>
> I want get the values follow the order of U1, U2 ... U10， but the 
> default order is U1, U10 ,……U9
>
> I know this is a common string sorting problem, but I do not know how 
> to solve it well.
>
> Any suggestions are very grateful !
> Thanks.
>
>
> _______________________________________________
> Interest mailing list
> Interest at qt-project.org
> http://lists.qt-project.org/mailman/listinfo/interest

-- 
http://www.classintouch.de - Tablet-Software für Lehrer

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.qt-project.org/pipermail/interest/attachments/20180107/fa6c294d/attachment.html>