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// Copyright (C) 2016 Intel Corporation.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
#ifndef QDEADLINETIMER_H
#define QDEADLINETIMER_H
#include <QtCore/qelapsedtimer.h>
#include <QtCore/qmetatype.h>
#include <QtCore/qnamespace.h>
#ifdef max
// un-pollute the namespace. We need std::numeric_limits::max() and std::chrono::duration::max()
# undef max
#endif
#include <limits>
#include <chrono>
QT_BEGIN_NAMESPACE
class Q_CORE_EXPORT QDeadlineTimer
{
public:
enum class ForeverConstant { Forever };
static constexpr ForeverConstant Forever = ForeverConstant::Forever;
constexpr QDeadlineTimer() noexcept = default;
constexpr explicit QDeadlineTimer(Qt::TimerType type_) noexcept
: type(type_) {}
constexpr QDeadlineTimer(ForeverConstant, Qt::TimerType type_ = Qt::CoarseTimer) noexcept
: t1((std::numeric_limits<qint64>::max)()), type(type_) {}
explicit QDeadlineTimer(qint64 msecs, Qt::TimerType type = Qt::CoarseTimer) noexcept;
void swap(QDeadlineTimer &other) noexcept
{ std::swap(t1, other.t1); std::swap(type, other.type); }
constexpr bool isForever() const noexcept
{ return t1 == (std::numeric_limits<qint64>::max)(); }
bool hasExpired() const noexcept;
Qt::TimerType timerType() const noexcept
{ return Qt::TimerType(type & 0xff); }
void setTimerType(Qt::TimerType type);
qint64 remainingTime() const noexcept;
qint64 remainingTimeNSecs() const noexcept;
void setRemainingTime(qint64 msecs, Qt::TimerType type = Qt::CoarseTimer) noexcept;
void setPreciseRemainingTime(qint64 secs, qint64 nsecs = 0,
Qt::TimerType type = Qt::CoarseTimer) noexcept;
qint64 deadline() const noexcept Q_DECL_PURE_FUNCTION;
qint64 deadlineNSecs() const noexcept Q_DECL_PURE_FUNCTION;
void setDeadline(qint64 msecs, Qt::TimerType timerType = Qt::CoarseTimer) noexcept;
void setPreciseDeadline(qint64 secs, qint64 nsecs = 0,
Qt::TimerType type = Qt::CoarseTimer) noexcept;
static QDeadlineTimer addNSecs(QDeadlineTimer dt, qint64 nsecs) noexcept Q_DECL_PURE_FUNCTION;
static QDeadlineTimer current(Qt::TimerType timerType = Qt::CoarseTimer) noexcept;
friend Q_CORE_EXPORT QDeadlineTimer operator+(QDeadlineTimer dt, qint64 msecs);
friend QDeadlineTimer operator+(qint64 msecs, QDeadlineTimer dt)
{ return dt + msecs; }
friend QDeadlineTimer operator-(QDeadlineTimer dt, qint64 msecs)
{ return dt + (-msecs); }
friend qint64 operator-(QDeadlineTimer dt1, QDeadlineTimer dt2)
{ return (dt1.deadlineNSecs() - dt2.deadlineNSecs()) / (1000 * 1000); }
QDeadlineTimer &operator+=(qint64 msecs)
{ *this = *this + msecs; return *this; }
QDeadlineTimer &operator-=(qint64 msecs)
{ *this = *this + (-msecs); return *this; }
template <class Clock, class Duration = typename Clock::duration>
QDeadlineTimer(std::chrono::time_point<Clock, Duration> deadline_,
Qt::TimerType type_ = Qt::CoarseTimer) : t2(0)
{ setDeadline(deadline_, type_); }
template <class Clock, class Duration = typename Clock::duration>
QDeadlineTimer &operator=(std::chrono::time_point<Clock, Duration> deadline_)
{ setDeadline(deadline_); return *this; }
template <class Clock, class Duration = typename Clock::duration>
void setDeadline(std::chrono::time_point<Clock, Duration> tp,
Qt::TimerType type_ = Qt::CoarseTimer);
template <class Clock, class Duration = typename Clock::duration>
std::chrono::time_point<Clock, Duration> deadline() const;
template <class Rep, class Period>
QDeadlineTimer(std::chrono::duration<Rep, Period> remaining, Qt::TimerType type_ = Qt::CoarseTimer)
: t2(0)
{ setRemainingTime(remaining, type_); }
template <class Rep, class Period>
QDeadlineTimer &operator=(std::chrono::duration<Rep, Period> remaining)
{ setRemainingTime(remaining); return *this; }
template <class Rep, class Period>
void setRemainingTime(std::chrono::duration<Rep, Period> remaining, Qt::TimerType type_ = Qt::CoarseTimer)
{
using namespace std::chrono;
if (remaining == remaining.max())
*this = QDeadlineTimer(Forever, type_);
else
setPreciseRemainingTime(0, ceil<nanoseconds>(remaining).count(), type_);
}
std::chrono::nanoseconds remainingTimeAsDuration() const noexcept
{
if (isForever())
return std::chrono::nanoseconds::max();
qint64 nsecs = rawRemainingTimeNSecs();
if (nsecs <= 0)
return std::chrono::nanoseconds::zero();
return std::chrono::nanoseconds(nsecs);
}
template <class Rep, class Period>
friend QDeadlineTimer operator+(QDeadlineTimer dt, std::chrono::duration<Rep, Period> value)
{ return QDeadlineTimer::addNSecs(dt, std::chrono::duration_cast<std::chrono::nanoseconds>(value).count()); }
template <class Rep, class Period>
friend QDeadlineTimer operator+(std::chrono::duration<Rep, Period> value, QDeadlineTimer dt)
{ return dt + value; }
template <class Rep, class Period>
friend QDeadlineTimer operator+=(QDeadlineTimer &dt, std::chrono::duration<Rep, Period> value)
{ return dt = dt + value; }
private:
friend bool comparesEqual(const QDeadlineTimer &lhs,
const QDeadlineTimer &rhs) noexcept
{
return lhs.t1 == rhs.t1;
}
friend Qt::strong_ordering compareThreeWay(const QDeadlineTimer &lhs,
const QDeadlineTimer &rhs) noexcept
{
return Qt::compareThreeWay(lhs.t1, rhs.t1);
}
Q_DECLARE_STRONGLY_ORDERED(QDeadlineTimer)
qint64 t1 = 0;
#if QT_VERSION < QT_VERSION_CHECK(7, 0, 0)
unsigned t2 = 0;
#endif
unsigned type = Qt::CoarseTimer;
qint64 rawRemainingTimeNSecs() const noexcept;
};
template<class Clock, class Duration>
std::chrono::time_point<Clock, Duration> QDeadlineTimer::deadline() const
{
using namespace std::chrono;
if constexpr (std::is_same_v<Clock, steady_clock>) {
auto val = duration_cast<Duration>(nanoseconds(deadlineNSecs()));
return time_point<Clock, Duration>(val);
} else {
auto val = nanoseconds(rawRemainingTimeNSecs()) + Clock::now();
return time_point_cast<Duration>(val);
}
}
template<class Clock, class Duration>
void QDeadlineTimer::setDeadline(std::chrono::time_point<Clock, Duration> tp, Qt::TimerType type_)
{
using namespace std::chrono;
if (tp == tp.max()) {
*this = Forever;
type = type_;
} else if constexpr (std::is_same_v<Clock, steady_clock>) {
setPreciseDeadline(0,
duration_cast<nanoseconds>(tp.time_since_epoch()).count(),
type_);
} else {
setPreciseRemainingTime(0, duration_cast<nanoseconds>(tp - Clock::now()).count(), type_);
}
}
Q_DECLARE_SHARED(QDeadlineTimer)
QT_END_NAMESPACE
QT_DECL_METATYPE_EXTERN(QDeadlineTimer, Q_CORE_EXPORT)
#endif // QDEADLINETIMER_H
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