How to work with QList correctly?

Question

Qt

We have a classic template program in Qt5, that is, there are files main.cpp, name.h, name.cpp.
In the file name.h there is a class app from qmainwindow, in it

private:
    ...
    QList<QwtPlotCurve> *graph;

The class constructor has

graph = new QList<QwtPlotCurve>[10];
for(int i=0; i < graph->size(); i++)
{

}

QwtPlotCurve has its own methods, and I need to recolor each curve in its own color, attach them to the widget via attach, and then update with a period of 1/25 sec. Separately with the curve, when they are not members of QList, I know how to work, but there's a gag. For example , they

graph[i].attach(ui->graphWidget);

swear No member named 'attach' in 'QList<QwtPlotCurve>', although QwtPlotCurve has such a method.

graph->at(i).attach(m_ui->graphWidget);

spits out

'this' argument to member function 'attach' has type 'const QwtPlotCurve', but function is not marked const

.

What is the correct way to access QList elements?

PS. I know how to read the exhaust, where my legs grow from, I understand, I don’t understand what to do.

Answer 1

It is possible like this:

private: 
QList<QwtPlotCurve> graph;

for(int i=0; i < 10; i++)
{
QwtPlotCurve curve;
carve.attach(…);
graph.push_back(curve);
}

Answer 2

You've new QList<QwtPlotCurve>[10];created an array of 10 lists here. Are you sure this is what you wanted?