will Qt delete all dynamic data?

[graeme]

Try the following:

#ifndef WIDGET_H
#define WIDGET_H
 
#include <QtGui>
 
class Widget : public QWidget
{
    Q_OBJECT
 
public:
    Widget(QWidget *parent = 0) : QWidget(parent) {}
 
    ~Widget()
    {
        qDebug() << "I AM IN DESTRUCTOR OF WIDGET!";
    }
};
 
#endif // WIDGET_H

#ifndef WIDGET_H
#define WIDGET_H

#include <QtGui>
 
class Widget : public QWidget
{
    Q_OBJECT

public:
    Widget(QWidget *parent = 0) : QWidget(parent) {}

    ~Widget()
    {
        qDebug() << "I AM IN DESTRUCTOR OF WIDGET!";
    }
};

#endif // WIDGET_H

To copy to clipboard, switch view to plain text mode 

#include "widget.h"
 
 
int main(int argc, char **argv)
{
    QApplication app(argc, argv);
 
    QMainWindow mainWin;
    Widget *widget = new Widget(&mainWin);
    mainWin.show();
 
    return app.exec();
};

#include "widget.h"


int main(int argc, char **argv)
{
    QApplication app(argc, argv);

    QMainWindow mainWin;
    Widget *widget = new Widget(&mainWin);
    mainWin.show();

    return app.exec();
};

To copy to clipboard, switch view to plain text mode 

See that whilst in the mainWindow I've not set up a parent when the app closes it gets deleted (because it's on the stack) and then the widget which is a child of mainWindow is deleted. (Or at least the destructor is called!)