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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#pragma once
#include <vespa/vespalib/util/time.h>
#include <atomic>
#include <memory>
namespace vespalib {
/**
* Clock is a clock that updates the time at defined intervals.
* It is intended used where you want to check the time with low cost, but where
* resolution is not that important.
*/
class Clock
{
private:
const std::atomic<steady_time> &_timeNS;
public:
Clock(const std::atomic<steady_time> & source) noexcept;
Clock(const Clock &) = delete;
Clock & operator =(const Clock &) = delete;
Clock(Clock &&) = delete;
Clock & operator =(Clock &&) = delete;
~Clock();
vespalib::steady_time getTimeNS() const noexcept {
return vespalib::steady_time(_timeNS.load(std::memory_order_relaxed));
}
};
}
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