| 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/qcompare.h> |
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| 8 | #include <QtCore/qglobal.h> |
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| 9 | |
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| 10 | #include <chrono> |
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| 11 | |
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| 12 | QT_BEGIN_NAMESPACE |
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| 13 | |
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| 14 | class Q_CORE_EXPORT QElapsedTimer |
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| 15 | { |
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| 16 | public: |
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| 17 | enum ClockType { |
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| 18 | SystemTime, |
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| 19 | MonotonicClock, |
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| 20 | TickCounter Q_DECL_ENUMERATOR_DEPRECATED_X( |
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| 21 | "Not supported anymore. Use PerformanceCounter instead." ), |
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| 22 | MachAbsoluteTime, |
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| 23 | PerformanceCounter |
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| 24 | }; |
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| 25 | |
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| 26 | // similar to std::chrono::*_clock |
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| 27 | using Duration = std::chrono::nanoseconds; |
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| 28 | using TimePoint = std::chrono::time_point<std::chrono::steady_clock, Duration>; |
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| 29 | |
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| 30 | constexpr QElapsedTimer() = default; |
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| 31 | |
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| 32 | static ClockType clockType() noexcept; |
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| 33 | static bool isMonotonic() noexcept; |
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| 34 | |
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| 35 | void start() noexcept; |
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| 36 | qint64 restart() noexcept; |
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| 37 | void invalidate() noexcept; |
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| 38 | bool isValid() const noexcept; |
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| 39 | |
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| 40 | Duration durationElapsed() const noexcept; |
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| 41 | qint64 nsecsElapsed() const noexcept; |
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| 42 | qint64 elapsed() const noexcept; |
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| 43 | bool hasExpired(qint64 timeout) const noexcept; |
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| 44 | |
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| 45 | qint64 msecsSinceReference() const noexcept; |
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| 46 | Duration durationTo(const QElapsedTimer &other) const noexcept; |
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| 47 | qint64 msecsTo(const QElapsedTimer &other) const noexcept; |
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| 48 | qint64 secsTo(const QElapsedTimer &other) const noexcept; |
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| 49 | friend bool Q_CORE_EXPORT operator<(const QElapsedTimer &lhs, const QElapsedTimer &rhs) noexcept; |
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| 50 | |
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| 51 | private: |
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| 52 | friend bool comparesEqual(const QElapsedTimer &lhs, const QElapsedTimer &rhs) noexcept |
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| 53 | { |
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| 54 | return lhs.t1 == rhs.t1 && lhs.t2 == rhs.t2; |
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| 55 | } |
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| 56 | Q_DECLARE_EQUALITY_COMPARABLE(QElapsedTimer) |
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| 57 | |
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| 58 | friend Qt::strong_ordering compareThreeWay(const QElapsedTimer &lhs, |
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| 59 | const QElapsedTimer &rhs) noexcept |
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| 60 | { |
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| 61 | return Qt::compareThreeWay(lhs: lhs.t1, rhs: rhs.t1); |
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| 62 | } |
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| 63 | |
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| 64 | #if defined(__cpp_lib_three_way_comparison) |
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| 65 | friend std::strong_ordering |
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| 66 | operator<=>(const QElapsedTimer &lhs, const QElapsedTimer &rhs) noexcept |
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| 67 | { |
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| 68 | return compareThreeWay(lhs, rhs); |
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| 69 | } |
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| 70 | #else |
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| 71 | friend bool operator>(const QElapsedTimer &lhs, const QElapsedTimer &rhs) noexcept |
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| 72 | { |
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| 73 | return is_gt(o: compareThreeWay(lhs, rhs)); |
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| 74 | } |
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| 75 | friend bool operator<=(const QElapsedTimer &lhs, const QElapsedTimer &rhs) noexcept |
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| 76 | { |
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| 77 | return is_lteq(o: compareThreeWay(lhs, rhs)); |
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| 78 | } |
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| 79 | friend bool operator>=(const QElapsedTimer &lhs, const QElapsedTimer &rhs) noexcept |
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| 80 | { |
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| 81 | return is_gteq(o: compareThreeWay(lhs, rhs)); |
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| 82 | } |
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| 83 | #endif // defined(__cpp_lib_three_way_comparison) |
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| 84 | qint64 t1 = Q_INT64_C(0x8000000000000000); |
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| 85 | qint64 t2 = Q_INT64_C(0x8000000000000000); |
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| 86 | }; |
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| 87 | |
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| 88 | QT_END_NAMESPACE |
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| 89 | |
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| 90 | #endif // QELAPSEDTIMER_H |
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| 91 | |
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