Memory management - Does addwidget assign a parent

Question

Say I have something like this

void someClass::start()
{
    QLabel* sb = new QLabel();
    sb->setText("Hello World");
    ui.verticalLayout->addWidget(sb);
}

Does addWidget make sb a child of someClass so that when I delete someClass sb is also deleted ? If this is true how do I know which methods in general assign parents to an object ?

In addition to the Violet's useful answer, you can always check yourself whether if a QObject has a parent, but calling the `parent()` method. — László Papp, Dec 31 '13 at 08:03

score 8 · Accepted Answer · answered Dec 31 '13 at 07:49

8

From http://qt-project.org/doc/qt-4.8/layout.html:

When you use a layout, you do not need to pass a parent when constructing the child widgets. The layout will automatically reparent the widgets (using QWidget::setParent()) so that they are children of the widget on which the layout is installed.

answered Dec 31 '13 at 07:49

Violet Giraffe

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Updated link: https://doc.qt.io/qt-6/layout.html#tips-for-using-layouts – LoneCodeRanger Oct 20 '22 at 16:58

Memory management - Does addwidget assign a parent

1 Answers1