qobject_cast<QVBoxLayout*>(layout()), is the appropriate cast?

Question

Considering the layout was set in a QWidget with the following code:

setLayout(new QVBoxLayout);

And then it needs to be retrieved (to add more stuff to the layout). This was done with the following code:

QHBoxLayout *hLayoutTime(new QHBoxLayout);
qobject_cast<QVBoxLayout*>(layout())->addLayout(hLayoutTime);

qobject_cast is the appropriate kind of cast to use here?

Answer 1

To avoid unneded casting write this like this:

void YourWidget::setupContents()
{
     QVBoxLayout *vLayout = new QVBoxLayout(this); // effectively this does setLayout(new QVBoxLayout);

     QHBoxLayout *hLayoutTime(new QHBoxLayout);
     vLayout->addLayout(hLayoutTime);
     … … …
}