How to change a member of a struct in QList

kahlenberg

I have a struct that has some variables, I made a QList from this struct, how can I change a struct in a given position in List?

struct Command
{
     QByteArray cmd;
    quint16 retry;
    bool acked;
};
....
 QList<Command> commandsList;
....
commandsList.value(cmdIndex).acked = true; /* Error: using temporary as lvalue [-fpermissive]*/
...
commandsList.at(cmdIndex).acked = true; /*Error:assignment of member 'Command::acked' in read-only object*/
/*I know, function at() returns const & which is not changable.*/

How can I change a member in QList?

kshegunov

Hello,
You can use the array access operator.
http://doc.qt.io/qt-5/qlist.html#operator-5b-5d

Kind regards.

kahlenberg

Thanks for answer, but it didn't work.

commandsList.operator[](cmdIndex).acked = true; // Am I using it true? (Runtime error)
commandsList[cmdIndex].acked = true;  //Runtime Error

I am receiving <Runtime error!>

mrjj

@kahlenberg said:
hi that is odd.
Can you show where you add items to commandsList ?
as to get runtime error then cmdIndex might be higher than
the number of items in the QList.

kahlenberg

Oh sorry, cmdIndex was out of range. I am sooo sory :)

mrjj

@kahlenberg
Well that happens to all of us :)
Good it was something simple and not some nasty memory overrun some where else.