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construct/include/ircd/util/timer.h

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// Matrix Construct
//
// Copyright (C) Matrix Construct Developers, Authors & Contributors
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// Copyright (C) 2016-2018 Jason Volk <jason@zemos.net>
//
// Permission to use, copy, modify, and/or distribute this software for any
// purpose with or without fee is hereby granted, provided that the above
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// copyright notice and this permission notice is present in all copies. The
// full license for this software is available in the LICENSE file.
#pragma once
#define HAVE_IRCD_UTIL_TIMER_H
namespace ircd::util
{
struct timer;
}
struct ircd::util::timer
{
IRCD_OVERLOAD(nostart)
using clock = std::chrono::steady_clock;
nanoseconds accumulator;
clock::time_point start;
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bool stopped() const;
template<class duration = std::chrono::seconds> duration get() const;
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template<class duration = std::chrono::seconds> duration at() const;
void cont();
void stop();
timer(const std::function<void ()> &);
timer(nostart_t);
timer();
};
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/// Default construction will start the timer.
inline
ircd::util::timer::timer()
:accumulator{0ns}
,start{clock::now()}
{
}
/// timer(timer::nostart)
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inline
ircd::util::timer::timer(nostart_t)
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:accumulator{0ns}
,start{clock::time_point::min()}
{
}
inline
ircd::util::timer::timer(const std::function<void ()> &func)
:timer{}
{
func();
stop();
}
inline void
ircd::util::timer::stop()
{
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if(stopped())
return;
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const auto now(clock::now());
accumulator += std::chrono::duration_cast<decltype(accumulator)>(now - start);
start = clock::time_point::min();
}
inline void
ircd::util::timer::cont()
{
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if(!stopped())
{
const auto now(clock::now());
accumulator += std::chrono::duration_cast<decltype(accumulator)>(now - start);
}
start = clock::now();
}
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template<class duration>
duration
ircd::util::timer::at()
const
{
const auto now(clock::now());
return duration_cast<duration>(now - start);
}
template<class duration>
duration
ircd::util::timer::get()
const
{
return std::chrono::duration_cast<duration>(accumulator);
}
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inline bool
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ircd::util::timer::stopped()
const
{
return start == clock::time_point::min();
}