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+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: Qt Software Information (qt-info@nokia.com)
+**
+** This file is part of the documentation of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the either Technology Preview License Agreement or the
+** Beta Release License Agreement.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file. Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain
+** additional rights. These rights are described in the Nokia Qt LGPL
+** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this
+** package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3.0 as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL included in the
+** packaging of this file. Please review the following information to
+** ensure the GNU General Public License version 3.0 requirements will be
+** met: http://www.gnu.org/copyleft/gpl.html.
+**
+** If you are unsure which license is appropriate for your use, please
+** contact the sales department at qt-sales@nokia.com.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include <QLabel>
+#include <QPushButton>
+
+#include "qtcast.h"
+
+MyWidget::MyWidget()
+{
+//! [0]
+ QObject *obj = new MyWidget;
+//! [0]
+
+//! [1]
+ QWidget *widget = qobject_cast<QWidget *>(obj);
+//! [1]
+
+//! [2]
+ MyWidget *myWidget = qobject_cast<MyWidget *>(obj);
+//! [2]
+
+//! [3]
+ QLabel *label = qobject_cast<QLabel *>(obj);
+//! [3] //! [4]
+ // label is 0
+//! [4]
+
+//! [5]
+ if (QLabel *label = qobject_cast<QLabel *>(obj)) {
+//! [5] //! [6]
+ label->setText(tr("Ping"));
+ } else if (QPushButton *button = qobject_cast<QPushButton *>(obj)) {
+ button->setText(tr("Pong!"));
+ }
+//! [6]
+}
+
+int main()
+{
+ return 0;
+}