QVector::size() makes program crash

[Jakob Clausen]

Hi all.

I have a function that looks like this

void IconWidget::changePixmap(int newIndex)
{
    if (newIndex < pixmaps.size())
        index = newIndex;

    updatePixmap();
}

pixmaps is declared as

typedef struct
{
    Pixmap::Index index;
    QPixmap lightNormal;
    QPixmap lightActive;
    QPixmap darkNormal;
    QPixmap darkActive;
} PixmapItem;

QVector<PixmapItem> pixmaps;

When I call. QVector::size(), then the program crashes with a segfault.
Any ideas?

[J.Hilk]

@Jakob-Clausen I would say, it's not breaking on the size call, but on the function entry point, on the very first thing it has to do with a member variable.

from top right I would say your IconWidget instance is invalid (null)

[Jakob Clausen]

That is interesting.
If I replace the first line in the function with something like

qDebug() << "hello";

Then it also crashes. If you are right, is this what is to be expected?

[J.Hilk]

@Jakob-Clausen jepp

[Jakob Clausen]

Ok. Maybe not quite that.
But your input helped me track down what the problem really was.
Thank you very much for your help.