1 | // Copyright (C) 2021 The Qt Company Ltd. |
2 | // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only |
3 | |
4 | #ifndef QQMLNULLABLEVALUE_P_H |
5 | #define QQMLNULLABLEVALUE_P_H |
6 | |
7 | // |
8 | // W A R N I N G |
9 | // ------------- |
10 | // |
11 | // This file is not part of the Qt API. It exists purely as an |
12 | // implementation detail. This header file may change from version to |
13 | // version without notice, or even be removed. |
14 | // |
15 | // We mean it. |
16 | // |
17 | |
18 | #include <QtCore/private/qglobal_p.h> |
19 | |
20 | QT_BEGIN_NAMESPACE |
21 | |
22 | template<typename T> |
23 | struct QQmlNullableValue |
24 | { |
25 | QQmlNullableValue() |
26 | : value(T()) {} |
27 | QQmlNullableValue(const QQmlNullableValue<T> &o) |
28 | : isNull(o.isNull), value(o.value) {} |
29 | QQmlNullableValue(const T &t) |
30 | : isNull(false), value(t) {} |
31 | QQmlNullableValue<T> &operator=(const T &t) |
32 | { isNull = false; value = t; return *this; } |
33 | QQmlNullableValue<T> &operator=(const QQmlNullableValue<T> &o) |
34 | { isNull = o.isNull; value = o.value; return *this; } |
35 | operator T() const { return value; } |
36 | |
37 | void invalidate() { isNull = true; } |
38 | bool isValid() const { return !isNull; } |
39 | bool isNull = true; |
40 | T value; |
41 | }; |
42 | |
43 | QT_END_NAMESPACE |
44 | |
45 | #endif // QQMLNULLABLEVALUE_P_H |
46 | |