| 1 | // Copyright (C) 2016 The Qt Company Ltd. |
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| 2 | // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only |
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| 3 | |
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| 4 | #ifndef QELAPSEDTIMER_H |
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| 5 | #define QELAPSEDTIMER_H |
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| 6 | |
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| 7 | #include <QtCore/qglobal.h> |
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| 8 | |
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| 9 | #include <chrono> |
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| 10 | |
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| 11 | QT_BEGIN_NAMESPACE |
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| 12 | |
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| 13 | class Q_CORE_EXPORT QElapsedTimer |
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| 14 | { |
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| 15 | public: |
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| 16 | enum ClockType { |
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| 17 | SystemTime, |
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| 18 | MonotonicClock, |
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| 19 | TickCounter Q_DECL_ENUMERATOR_DEPRECATED_X( |
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| 20 | "Not supported anymore. Use PerformanceCounter instead." ), |
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| 21 | MachAbsoluteTime, |
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| 22 | PerformanceCounter |
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| 23 | }; |
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| 24 | |
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| 25 | // similar to std::chrono::*_clock |
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| 26 | using Duration = std::chrono::nanoseconds; |
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| 27 | using TimePoint = std::chrono::time_point<std::chrono::steady_clock, Duration>; |
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| 28 | |
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| 29 | constexpr QElapsedTimer() = default; |
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| 30 | |
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| 31 | static ClockType clockType() noexcept; |
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| 32 | static bool isMonotonic() noexcept; |
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| 33 | |
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| 34 | void start() noexcept; |
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| 35 | qint64 restart() noexcept; |
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| 36 | void invalidate() noexcept; |
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| 37 | bool isValid() const noexcept; |
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| 38 | |
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| 39 | Duration durationElapsed() const noexcept; |
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| 40 | qint64 nsecsElapsed() const noexcept; |
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| 41 | qint64 elapsed() const noexcept; |
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| 42 | bool hasExpired(qint64 timeout) const noexcept; |
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| 43 | |
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| 44 | qint64 msecsSinceReference() const noexcept; |
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| 45 | Duration durationTo(const QElapsedTimer &other) const noexcept; |
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| 46 | qint64 msecsTo(const QElapsedTimer &other) const noexcept; |
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| 47 | qint64 secsTo(const QElapsedTimer &other) const noexcept; |
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| 48 | |
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| 49 | friend bool operator==(const QElapsedTimer &lhs, const QElapsedTimer &rhs) noexcept |
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| 50 | { return lhs.t1 == rhs.t1 && lhs.t2 == rhs.t2; } |
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| 51 | friend bool operator!=(const QElapsedTimer &lhs, const QElapsedTimer &rhs) noexcept |
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| 52 | { return !(lhs == rhs); } |
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| 53 | |
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| 54 | friend bool Q_CORE_EXPORT operator<(const QElapsedTimer &lhs, const QElapsedTimer &rhs) noexcept; |
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| 55 | |
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| 56 | private: |
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| 57 | qint64 t1 = Q_INT64_C(0x8000000000000000); |
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| 58 | qint64 t2 = Q_INT64_C(0x8000000000000000); |
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| 59 | }; |
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| 60 | |
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| 61 | QT_END_NAMESPACE |
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| 62 | |
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| 63 | #endif // QELAPSEDTIMER_H |
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| 64 | |
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