deleting a widget

[john_god]

I have this code:

void MainWindow::on_actionSomeButton_triggered()
{
    QWidgetDerivedClass *wid = new QWidgetDerivedClass ;
    wid->show();
}

void MainWindow::on_actionSomeButton_triggered()
{
    QWidgetDerivedClass *wid = new QWidgetDerivedClass ;
    wid->show();
}

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If I create the widget with Qt::WA_DeleteOnClose, this will free the memory allocated with new operator, when the user closes the widget? If not, to free the memory, is it valid to do:

QWidgetDerivedClass::~QWidgetDerivedClass()
{
     delete this;
}

QWidgetDerivedClass::~QWidgetDerivedClass()
{
     delete this;
}

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Just want to make share I'm not leaking memory.