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76 lines
2.6 KiB
C++
76 lines
2.6 KiB
C++
/****************************************************************************
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**
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** Copyright (C) 2015 The Qt Company Ltd.
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** Copyright (C) 2016-2020 Ivailo Monev
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**
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** This file is part of the QtCore module of the Katie Toolkit.
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**
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** $QT_BEGIN_LICENSE:LGPL$
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**
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** GNU Lesser General Public License Usage
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** This file may be used under the terms of the GNU Lesser
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** General Public License version 2.1 as published by the Free Software
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** Foundation and appearing in the file LICENSE.LGPL included in the
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** packaging of this file. Please review the following information to
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** ensure the GNU Lesser General Public License version 2.1 requirements
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** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
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**
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** As a special exception, The Qt Company gives you certain additional
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** rights. These rights are described in The Qt Company LGPL Exception
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** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
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**
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** GNU General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU
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** General Public License version 3.0 as published by the Free Software
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** Foundation and appearing in the file LICENSE.GPL included in the
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** packaging of this file. Please review the following information to
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** ensure the GNU General Public License version 3.0 requirements will be
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** met: http://www.gnu.org/copyleft/gpl.html.
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**
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** $QT_END_LICENSE$
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**
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****************************************************************************/
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#include "qscopedvaluerollback.h"
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QT_BEGIN_NAMESPACE
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/*!
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\class QScopedValueRollback
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\brief The QScopedValueRollback class resets a variable to its previous value on destruction.
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\since 4.8
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\ingroup misc
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The QScopedAssignment class can be used to revert state when an
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exception is thrown without needing to write try-catch blocks.
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It can also be used to manage variables that are temporarily set,
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such as reentrancy guards. By using this class, the variable will
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be reset whether the function is exited normally, exited early by
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a return statement, or exited by an exception.
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The template can only be instantiated with a type that supports assignment.
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\sa QScopedPointer
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*/
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/*!
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\fn QScopedValueRollback::QScopedValueRollback(T &var)
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Stores the previous value of \a var internally, for revert on destruction.
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*/
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/*!
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\fn QScopedValueRollback::~QScopedValueRollback()
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Assigns the previous value to the managed variable.
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This is the value at construction time, or at the last call to commit()
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*/
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/*!
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\fn void QScopedValueRollback::commit()
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Updates the previous value of the managed variable to its current value.
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*/
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QT_END_NAMESPACE
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