Does QWidget::setAttribute() work with QWidget child classes?

[Lykurg]

this is a question you can answer yourself. Simply create a subclass and see if the d-tor is called:

class MyWidget : public QWidget
{
  Q_OBJECT
 
  public:
    MyWidget(QWidget* parent = 0) : QWidget(parent) { setAttribute(Qt::WA_DeleteOnClose); }
    ~MyWidget() { qDebug() << Q_FUNC_INFO; }
}

class MyWidget : public QWidget
{
  Q_OBJECT

  public:
    MyWidget(QWidget* parent = 0) : QWidget(parent) { setAttribute(Qt::WA_DeleteOnClose); }
    ~MyWidget() { qDebug() << Q_FUNC_INFO; }
}

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and now see the output and your question answered.