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48 lines
913 B
C++
48 lines
913 B
C++
// Copyright (C) 2016 The Qt Company Ltd.
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// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
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#ifndef QSCOPEDVALUEROLLBACK_H
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#define QSCOPEDVALUEROLLBACK_H
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#include <QtCore/qglobal.h>
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QT_BEGIN_NAMESPACE
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template <typename T>
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class [[nodiscard]] QScopedValueRollback
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{
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public:
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explicit constexpr QScopedValueRollback(T &var)
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: varRef(var), oldValue(var)
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{
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}
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explicit constexpr QScopedValueRollback(T &var, T value)
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: varRef(var), oldValue(qExchange(var, std::move(value)))
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{
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}
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#if __cpp_constexpr >= 201907L
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constexpr
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#endif
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~QScopedValueRollback()
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{
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varRef = std::move(oldValue);
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}
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constexpr void commit()
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{
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oldValue = varRef;
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}
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private:
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T &varRef;
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T oldValue;
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Q_DISABLE_COPY_MOVE(QScopedValueRollback)
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};
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QT_END_NAMESPACE
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#endif // QSCOPEDVALUEROLLBACK_H
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