runtime error terminate called after throwing an instance of 'std::bad_alloc'

[Lasith]

In my Qt C++ application I have a QList<QStringList> I want to increase the contents of each index by the same amount!

void MainWindow::on_pushButton_clicked()
{

    list1<<"a"<<"b"<<"c"<<"d"<<"e";
    list2<<"f"<<"g"<<"h"<<"i"<<"j";

    List1<<list1;
    List2<<list2;



        for(int k=0;k<2;k++){
        for(int i=0;i<List1.size();i++){
            for(int j=0;j<List1[0].size();j++){
            List1[i]<<List1[i][j];
            }
        }

}
}

from the above code I want to make the contents of 0th index of List (i.e List[0]) a QStringList of "a" "b" "c" "d" "e" "a" "b" "c" "d" "e" and the contents of 1st index of List (i.e List[1]) a QStringList of "f" "g" "h" "i" "j" "f" "g" "h" "i" "j"! But when I click the button I get the run time error stating

terminate called after throwing an instance of 'std::bad_alloc'
How can I correct this?

[JonB]

@Lasith

List1[i]<<List1[i][j];

What's this? :)

[Lasith]

@JNBarchan adding elemnts to existing indices

[mrjj]

What is list1 and list2 defined as ?
QStringList or
QList<QStringList> ?

[Lasith]

@mrjj They are QStringLists!

[mrjj]

@Lasith
Seems somebody else doing the same :)
https://forum.qt.io/topic/85876/increasing-qlist-qstringlist-contents-twice
VRonin show how to add.

[Lasith]

@mrjj sorry he does not get any error but I get a run time error :(

[mrjj]

@Lasith
well std::bad_alloc often comes when out of memory.
My guess is that <List1[0].size() is always true since you add to it for each loop
and hence create an infinite loop.

Did you try VRonin code?

Update:
If you just want list1 in [0] and list2 in[1]
why all the loops then?