1 files changed, 81 insertions, 0 deletions
diff --git a/src/corelib/tools/qscopedvaluerollback.h b/src/corelib/tools/qscopedvaluerollback.h
new file mode 100644
index 0000000..d344ed8
--- /dev/null
+++ b/src/corelib/tools/qscopedvaluerollback.h
@@ -0,0 +1,81 @@
+/****************************************************************************
+**
+** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the QtCore module 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 Technology Preview License Agreement accompanying
+** this package.
+**
+** 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 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** If you have questions regarding the use of this file, please contact
+** Nokia at qt-info@nokia.com.
+**
+**
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QSCOPEDVALUEROLLBACK_H
+#define QSCOPEDVALUEROLLBACK_H
+
+#include <QtCore/qglobal.h>
+
+QT_BEGIN_HEADER
+QT_BEGIN_NAMESPACE
+QT_MODULE(Core)
+
+template <typename T>
+class QScopedValueRollback
+{
+public:
+    QScopedValueRollback(T &var) :
+        varRef(var)
+    {
+        oldValue = varRef;
+    }
+
+    ~QScopedValueRollback()
+    {
+        varRef = oldValue;
+    }
+
+    void commit()
+    {
+        oldValue = varRef;
+    }
+
+private:
+    T& varRef;
+    T oldValue;
+
+    Q_DISABLE_COPY(QScopedValueRollback);
+};
+
+QT_END_NAMESPACE
+QT_END_HEADER
+
+#endif // QSCOPEDVALUEROLLBACK_H