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/****************************************************************************
**
** Copyright (C) 2012 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.
**
** $QT_BEGIN_LICENSE:LGPL$
** GNU Lesser General Public License Usage
** 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.
**
** 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.
**
** Other Usage
** Alternatively, this file may be used in accordance with the terms and
** conditions contained in a signed written agreement between you and Nokia.
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "qscopedvaluerollback.h"
QT_BEGIN_NAMESPACE
/*!
\class QScopedValueRollback
\brief The QScopedValueRollback class resets a variable to its previous value on destruction.
\since 4.8
\ingroup misc
The QScopedAssignment class can be used to revert state when an
exception is thrown without needing to write try-catch blocks.
It can also be used to manage variables that are temporarily set,
such as reentrancy guards. By using this class, the variable will
be reset whether the function is exited normally, exited early by
a return statement, or exited by an exception.
The template can only be instantiated with a type that supports assignment.
\sa QScopedPointer
*/
/*!
\fn QScopedValueRollback::QScopedValueRollback(T &var)
Stores the previous value of \a var internally, for revert on destruction.
*/
/*!
\fn QScopedValueRollback::~QScopedValueRollback()
Assigns the previous value to the managed variable.
This is the value at construction time, or at the last call to commit()
*/
/*!
\fn void QScopedValueRollback::commit()
Updates the previous value of the managed variable to its current value.
*/
QT_END_NAMESPACE
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