QList inside a QList

Hi,

I have a QList integrated with other QList<QPointF>, but it's impossible to add elements to the second QList.

For instance, the next code does not compile (2 overloads have no legal conversion for "this" pointer), but it should...

Code:

---

//Please note the blank space between the two ">"
QList<QList<QPointF> > my_list;
QPointF my_point(0, 10);
my_list.at(0).append(my_point);

---

then... how can I add elements to a lists of lists in qt? is it possible?

my bad, I just need to create a new QList<QPointF> and append it to the "big one". Is quite stupid to try to add an element inside a QList at the position zero when inside the zero position there is nothing :(

Hi jano_alex_es!

It is possible, the only problem is that QList::at returns a const reference to the item, use the [] operator instead. Of course, a new list should be added to my_list first.

Code:

---

QList<QList<QPointF> > my_list;
QList<QPointF> my_subList;
QPointF my_point(0, 10);
my_list.append(my_subList);
my_list[0].append(my_point);

---

It's not the best example, because my_point could be added to my_subList, and then my_subList to my_list.