1/****************************************************************************
2**
3** Copyright (C) 2016 The Qt Company Ltd.
4** Contact: https://www.qt.io/licensing/
5**
6** This file is part of the QtCore module of the Qt Toolkit.
7**
8** $QT_BEGIN_LICENSE:LGPL$
9** Commercial License Usage
10** Licensees holding valid commercial Qt licenses may use this file in
11** accordance with the commercial license agreement provided with the
12** Software or, alternatively, in accordance with the terms contained in
13** a written agreement between you and The Qt Company. For licensing terms
14** and conditions see https://www.qt.io/terms-conditions. For further
15** information use the contact form at https://www.qt.io/contact-us.
16**
17** GNU Lesser General Public License Usage
18** Alternatively, this file may be used under the terms of the GNU Lesser
19** General Public License version 3 as published by the Free Software
20** Foundation and appearing in the file LICENSE.LGPL3 included in the
21** packaging of this file. Please review the following information to
22** ensure the GNU Lesser General Public License version 3 requirements
23** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
24**
25** GNU General Public License Usage
26** Alternatively, this file may be used under the terms of the GNU
27** General Public License version 2.0 or (at your option) the GNU General
28** Public license version 3 or any later version approved by the KDE Free
29** Qt Foundation. The licenses are as published by the Free Software
30** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
31** included in the packaging of this file. Please review the following
32** information to ensure the GNU General Public License requirements will
33** be met: https://www.gnu.org/licenses/gpl-2.0.html and
34** https://www.gnu.org/licenses/gpl-3.0.html.
35**
36** $QT_END_LICENSE$
37**
38****************************************************************************/
39
40#ifndef QELAPSEDTIMER_H
41#define QELAPSEDTIMER_H
42
43#include <QtCore/qglobal.h>
44
45QT_BEGIN_NAMESPACE
46
47
48class Q_CORE_EXPORT QElapsedTimer
49{
50public:
51 enum ClockType {
52 SystemTime,
53 MonotonicClock,
54 TickCounter,
55 MachAbsoluteTime,
56 PerformanceCounter
57 };
58
59 Q_DECL_CONSTEXPR QElapsedTimer()
60 : t1(Q_INT64_C(0x8000000000000000)),
61 t2(Q_INT64_C(0x8000000000000000))
62 {
63 }
64
65 static ClockType clockType() noexcept;
66 static bool isMonotonic() noexcept;
67
68 void start() noexcept;
69 qint64 restart() noexcept;
70 void invalidate() noexcept;
71 bool isValid() const noexcept;
72
73 qint64 nsecsElapsed() const noexcept;
74 qint64 elapsed() const noexcept;
75 bool hasExpired(qint64 timeout) const noexcept;
76
77 qint64 msecsSinceReference() const noexcept;
78 qint64 msecsTo(const QElapsedTimer &other) const noexcept;
79 qint64 secsTo(const QElapsedTimer &other) const noexcept;
80
81 bool operator==(const QElapsedTimer &other) const noexcept
82 { return t1 == other.t1 && t2 == other.t2; }
83 bool operator!=(const QElapsedTimer &other) const noexcept
84 { return !(*this == other); }
85
86 friend bool Q_CORE_EXPORT operator<(const QElapsedTimer &v1, const QElapsedTimer &v2) noexcept;
87
88private:
89 qint64 t1;
90 qint64 t2;
91};
92
93QT_END_NAMESPACE
94
95#endif // QELAPSEDTIMER_H
96