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SteppableClock.hpp
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SteppableClock.hpp
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// Copyright (c) Microsoft Corporation. All rights reserved.
// Licensed under the MIT License.
#ifndef airsim_core_SteppableClock_hpp
#define airsim_core_SteppableClock_hpp
#include "ClockBase.hpp"
#include "Common.hpp"
#include <atomic>
namespace msr
{
namespace airlib
{
class SteppableClock : public ClockBase
{
public:
static constexpr real_T DefaultStepSize = 20E-3f;
//Debug clock allows to advance the clock manually in arbitrary way
//TTimePoint is nano seconds passed since some fixed point in time
//step is how much we would advance the clock by default when calling step()
//by default we advance by 20ms
SteppableClock(TTimeDelta step = DefaultStepSize, TTimePoint start = 0)
: current_(start), step_(step)
{
start_ = current_ = start ? start : Utils::getTimeSinceEpochNanos();
}
virtual ~SteppableClock() {}
virtual TTimePoint stepBy(TTimeDelta amount) override
{
current_ = addTo(current_, amount);
return current_;
}
virtual TTimePoint step() override
{
ClockBase::step();
current_ = addTo(current_, step_);
return current_;
}
TTimeDelta getStepSize() const
{
return step_;
}
virtual TTimePoint nowNanos() const override
{
return current_;
}
virtual TTimePoint getStart() const override
{
return start_;
}
private:
std::atomic<TTimePoint> current_;
std::atomic<TTimePoint> start_;
TTimeDelta step_;
};
}
} //namespace
#endif