summaryrefslogtreecommitdiffstats
path: root/src/corelib/kernel/qelapsedtimer.h
blob: 7954b41bf4903123fbae1323b60c9cdd15df21b3 (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
86
87
88
89
90
91
92
93
94
95
/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the QtCore module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** 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.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 3 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL3 included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 3 requirements
** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 2.0 or (at your option) the GNU General
** Public license version 3 or any later version approved by the KDE Free
** Qt Foundation. The licenses are as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
** be met: https://www.gnu.org/licenses/gpl-2.0.html and
** https://www.gnu.org/licenses/gpl-3.0.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/

#ifndef QELAPSEDTIMER_H
#define QELAPSEDTIMER_H

#include <QtCore/qglobal.h>

QT_BEGIN_NAMESPACE


class Q_CORE_EXPORT QElapsedTimer
{
public:
    enum ClockType {
        SystemTime,
        MonotonicClock,
        TickCounter,
        MachAbsoluteTime,
        PerformanceCounter
    };

    Q_DECL_CONSTEXPR QElapsedTimer()
        : t1(Q_INT64_C(0x8000000000000000)),
          t2(Q_INT64_C(0x8000000000000000))
    {
    }

    static ClockType clockType() Q_DECL_NOTHROW;
    static bool isMonotonic() Q_DECL_NOTHROW;

    void start() Q_DECL_NOTHROW;
    qint64 restart() Q_DECL_NOTHROW;
    void invalidate() Q_DECL_NOTHROW;
    bool isValid() const Q_DECL_NOTHROW;

    qint64 nsecsElapsed() const Q_DECL_NOTHROW;
    qint64 elapsed() const Q_DECL_NOTHROW;
    bool hasExpired(qint64 timeout) const Q_DECL_NOTHROW;

    qint64 msecsSinceReference() const Q_DECL_NOTHROW;
    qint64 msecsTo(const QElapsedTimer &other) const Q_DECL_NOTHROW;
    qint64 secsTo(const QElapsedTimer &other) const Q_DECL_NOTHROW;

    bool operator==(const QElapsedTimer &other) const Q_DECL_NOTHROW
    { return t1 == other.t1 && t2 == other.t2; }
    bool operator!=(const QElapsedTimer &other) const Q_DECL_NOTHROW
    { return !(*this == other); }

    friend bool Q_CORE_EXPORT operator<(const QElapsedTimer &v1, const QElapsedTimer &v2) Q_DECL_NOTHROW;

private:
    qint64 t1;
    qint64 t2;
};

QT_END_NAMESPACE

#endif // QELAPSEDTIMER_H