qelapsedtimer.h

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#ifndef QTIMESTAMP_H
#define QTIMESTAMP_H

#include <QtCore/qglobal.h>

QT_BEGIN_HEADER

QT_BEGIN_NAMESPACE

QT_MODULE(Core)

class Q_CORE_EXPORT QElapsedTimer
{
public:
    enum ClockType {
        SystemTime,
        MonotonicClock,
        TickCounter,
        MachAbsoluteTime,
        PerformanceCounter
    };
    static ClockType clockType();
    static bool isMonotonic();

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

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

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

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

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

private:
    qint64 t1;
    qint64 t2;
};

QT_END_NAMESPACE

QT_END_HEADER

#endif // QTIMESTAMP_H