Would be an c++ topic, which is the way to change variables values from references by a QString<List>?

[Ripley]

Hi everybody i got have this piece of code. My main target is change the values of the variables to 0 but when it's iterating in foreach function doesn't changes their values. Example:

QList<int> integerList = {var1, var2, var3};

foreach(int x, integerList)
    x = 0;

And if build it as reference this sets me problems

QList<int> integerList = {var1, var2, var3};

foreach(int &x, integerList)
    x = 0;

[JonB]

@ripley
I'm not a C++ expert, but it's to do with when it takes copies of the elements and foreach, or something like that. Is it that bad if you write instead:

for (int i = 0; i < integerList.size(); i++)
    integerList[i] = 0;

[mrjj]

Hi
try the c++ 11 range base loop instead of the foreach macro ?

QList<int> integerList = {1, 2, 3};
  for (int& x : integerList) {
    x = 0;
  }

however, you will only change the ints inside the list, not the original var1-var3
as they are just copied to the list.

[J.Hilk]

@mrjj said in Would be an c++ topic, which is the way to change variables values from references by a QString<List>?:

however, you will only change the ints inside the list, not the original var1-var3
as they are just copied to the list.

does the initializer list accept variables ?

[mrjj]

@j-hilk
Well yes and no. :)
it will accept what class accepts but
by value will result in a copy.

But you can do funky stuff if you like

int funky1=100;
  QList<int*> integerList = {&funky1};
  *integerList[0] = 90;

  qDebug()<< funky1;

output: 90

however, im not sure its possible with no * or &.
then you need overloaded = i guess to keep tab on the actual variable.

[Ripley]

@mrjj Thanks my friend your answer has helped me.