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j2doll/QtMOC.cpp

Created January 16, 2018 07:50
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Qt MOC sample #1
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QtMOC.cpp
// class MyWidget : public QWidget
QObject *obj = new MyWidget;
QWidget *widget = qobject_cast<QWidget *>(obj);
Q_ASSERT( widget != NULL );
MyWidget *myWidget = qobject_cast<MyWidget *>(obj);
Q_ASSERT( myWidget != NULL );
QLabel *label = qobject_cast<QLabel *>(obj);
Q_ASSERT( label != NULL ); // label is 0(NULL). because obj is not inherited from QLabel.
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