[Solved] How to iterate a QList<QMap<QString,QString>> list ?

inejose

Hi,

I'd like to iterate a QList<QMap<QString,QString>> list, but with foreach I obtain an error.

I tried this with no result:

@QList<QMap<QString,QString>> myList;

foreach(QMap<QString,QString> singleItem, myList) {
//code here
}@

Compiler error are:

C2275 and C2065

Thanks in advance.

sierdzio

Please read the documentation of foreach! An explanation an a solution to your problem is already there.

"Link":http://qt-project.org/doc/qt-5/containers.html#the-foreach-keyword.

ScottR

@
typedef QMap<QString, QString> myMapType;

QList<myMapType> myList;

foreach(myMapType m, myList)
{
// code here
}
@

Xander84

did you try the native c++11 for-each loop?
it should work without a typedef, just as an alternative if you have access to c++11:
@
QList<QMap<QString,QString>> myList;

for(QMap<QString,QString>& singleItem : myList) {
//code here
}
@
I just used a reference (&) for the "singleItem".

inejose

Thank you very much for your responses. I have finally used the following code:

@QList<QMap<QString,QString>> myList;

while(!myList.isEmpty()){
QMap<QString, QString> singleElement = myList.takeFirst();
//my code
}@

SGaist

Hi,

Just to be sure you won't get bitten, you know that takeFirst removes the element ? Are you sure it's the behavior you want ?

inejose

Yes, I know, I used it in an operation where the information storage and order don't matter

Thanks for the advice.