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/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the QtCore module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 3 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL3 included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 3 requirements
** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 2.0 or (at your option) the GNU General
** Public license version 3 or any later version approved by the KDE Free
** Qt Foundation. The licenses are as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
** be met: https://www.gnu.org/licenses/gpl-2.0.html and
** https://www.gnu.org/licenses/gpl-3.0.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/

#ifndef QSCOPEDVALUEROLLBACK_H
#define QSCOPEDVALUEROLLBACK_H

#include <QtCore/qglobal.h>

QT_BEGIN_NAMESPACE

template <typename T>
class [[nodiscard]] QScopedValueRollback
{
public:
    explicit constexpr QScopedValueRollback(T &var)
        : varRef(var), oldValue(var)
    {
    }

    explicit constexpr QScopedValueRollback(T &var, T value)
        : varRef(var), oldValue(qExchange(var, std::move(value)))
    {
    }

#if __cpp_constexpr >= 201907L
    constexpr
#endif
    ~QScopedValueRollback()
    {
        varRef = std::move(oldValue);
    }

    constexpr void commit()
    {
        oldValue = varRef;
    }

private:
    T &varRef;
    T oldValue;

    Q_DISABLE_COPY(QScopedValueRollback)
};

QT_END_NAMESPACE

#endif // QSCOPEDVALUEROLLBACK_H