blob: a2642d0aff6b9d5f05e0f5a5ee0dff0f249a76c0 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
|
/****************************************************************************
**
** Copyright (C) 2021 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the QtCore module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:COMM$
**
** 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.
**
** $QT_END_LICENSE$
**
**
**
**
**
**
**
**
**
**
**
**
**
**
**
**
**
**
**
****************************************************************************/
#ifndef QSCOPEDVALUEROLLBACK_H
#define QSCOPEDVALUEROLLBACK_H
#include <QtCore/qglobal.h>
QT_BEGIN_NAMESPACE
template <typename T>
class
#if QT_HAS_CPP_ATTRIBUTE(nodiscard) && __cplusplus >= 201703L
[[nodiscard]]
#endif
QScopedValueRollback
{
public:
explicit QScopedValueRollback(T &var)
: varRef(var), oldValue(var)
{
}
explicit QScopedValueRollback(T &var, T value)
: varRef(var), oldValue(std::move(var))
{
varRef = std::move(value);
}
~QScopedValueRollback()
{
varRef = std::move(oldValue);
}
void commit()
{
oldValue = varRef;
}
private:
T &varRef;
T oldValue;
Q_DISABLE_COPY(QScopedValueRollback)
};
QT_END_NAMESPACE
#endif // QSCOPEDVALUEROLLBACK_H
|
