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// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
#ifndef QELAPSEDTIMER_H
#define QELAPSEDTIMER_H
#include <QtCore/qglobal.h>
#include <chrono>
QT_BEGIN_NAMESPACE
class Q_CORE_EXPORT QElapsedTimer
{
public:
enum ClockType {
SystemTime,
MonotonicClock,
TickCounter Q_DECL_ENUMERATOR_DEPRECATED_X(
"Not supported anymore. Use PerformanceCounter instead."),
MachAbsoluteTime,
PerformanceCounter
};
// similar to std::chrono::*_clock
using Duration = std::chrono::nanoseconds;
using TimePoint = std::chrono::time_point<std::chrono::steady_clock, Duration>;
constexpr QElapsedTimer() = default;
static ClockType clockType() noexcept;
static bool isMonotonic() noexcept;
void start() noexcept;
qint64 restart() noexcept;
void invalidate() noexcept;
bool isValid() const noexcept;
Duration durationElapsed() const noexcept;
qint64 nsecsElapsed() const noexcept;
qint64 elapsed() const noexcept;
bool hasExpired(qint64 timeout) const noexcept;
qint64 msecsSinceReference() const noexcept;
Duration durationTo(const QElapsedTimer &other) const noexcept;
qint64 msecsTo(const QElapsedTimer &other) const noexcept;
qint64 secsTo(const QElapsedTimer &other) const noexcept;
friend bool operator==(const QElapsedTimer &lhs, const QElapsedTimer &rhs) noexcept
{ return lhs.t1 == rhs.t1 && lhs.t2 == rhs.t2; }
friend bool operator!=(const QElapsedTimer &lhs, const QElapsedTimer &rhs) noexcept
{ return !(lhs == rhs); }
friend bool Q_CORE_EXPORT operator<(const QElapsedTimer &lhs, const QElapsedTimer &rhs) noexcept;
private:
qint64 t1 = Q_INT64_C(0x8000000000000000);
qint64 t2 = Q_INT64_C(0x8000000000000000);
};
QT_END_NAMESPACE
#endif // QELAPSEDTIMER_H
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