blob: 36787ecd8764ec57b20458c912bd047d7dbb79e6 (
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
|
// Copyright (C) 2021 Klarälvdalens Datakonsult AB, a KDAB Group company, info@kdab.com, author Marc Mutz <marc.mutz@kdab.com>
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
#ifndef QVOLATILE_P_H
#define QVOLATILE_P_H
//
// W A R N I N G
// -------------
//
// This file is not part of the Qt API. It exists for the convenience
// of a number of Qt sources files. This header file may change from
// version to version without notice, or even be removed.
//
// We mean it.
//
#include <QtCore/private/qglobal_p.h>
QT_BEGIN_NAMESPACE
namespace QtPrivate {
template <typename T>
using if_volatile = std::enable_if_t<std::is_volatile_v<T>, bool>;
//
// C++20-deprecated volatile compound operations, rewritten as separated operations
//
// these functions return `auto`, not `T`, to strip cv-qualifiers without having
// to mention the `volatile` keyword
template <typename T, QtPrivate::if_volatile<T> = true>
auto volatilePreIncrement(T &x) {
auto y = x;
++y;
x = y;
return y;
}
template <typename T, QtPrivate::if_volatile<T> = true>
auto volatilePreDecrement(T &x)
{
auto y = x;
--y;
x = y;
return y;
}
} // namespace QtPrivate
QT_END_NAMESPACE
#endif // QVOLATILE_H
|
