mirror of
https://github.com/matrix-construct/construct
synced 2024-11-18 16:00:57 +01:00
117 lines
2.6 KiB
C++
117 lines
2.6 KiB
C++
// Matrix Construct
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//
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// Copyright (C) Matrix Construct Developers, Authors & Contributors
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// Copyright (C) 2016-2018 Jason Volk <jason@zemos.net>
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//
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// Permission to use, copy, modify, and/or distribute this software for any
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// 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
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// full license for this software is available in the LICENSE file.
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#pragma once
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#define HAVE_IRCD_UTIL_TIMER_H
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namespace ircd {
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inline namespace util
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{
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struct timer;
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}}
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/// Stopwatch w/ accumulation.
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///
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/// This utility can be used to gauge the duration of something. The clock
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/// is started by default upon construction. Users can query the running time
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/// using the at(), or using the pretty() convenience.
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///
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/// This timer features an accumulator state so the clock can be stopped and
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/// continued, and each time the accumulator is updated. The accumulator
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/// value is always added into results: when the timer is stopped, the result
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/// is simply the accumulator value; when the clock is running, the result is
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/// the accumulator value added to the difference of the current time and the
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/// last start time.
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///
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/// One can instantiate the timer without starting the clock with the `nostart`
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/// overload. Additionally, a lambda constructor will accumulate the time it
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/// takes to execute the provided function.
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struct ircd::util::timer
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{
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using clock = std::chrono::steady_clock;
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IRCD_OVERLOAD(nostart)
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nanoseconds accumulator
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{
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0ns
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};
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clock::time_point start
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{
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clock::now()
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};
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// Observers
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bool stopped() const;
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template<class duration = std::chrono::seconds> duration at() const;
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// Convenience wrapper for util::pretty()
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string_view pretty(const mutable_buffer &out, const int &fmt = 0) const;
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std::string pretty(const int &fmt = 0) const;
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// Control
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void cont();
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void stop();
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constexpr timer(nostart_t);
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constexpr timer(const bool cond);
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timer(const std::function<void ()> &);
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timer() = default;
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};
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constexpr
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ircd::util::timer::timer(const bool cond)
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:start
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{
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cond?
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clock::now():
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clock::time_point::min()
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}
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{}
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constexpr
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ircd::util::timer::timer(nostart_t)
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:start
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{
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clock::time_point::min()
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}
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{}
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template<class duration>
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inline duration
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ircd::util::timer::at()
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const
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{
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const auto now
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{
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!stopped()?
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clock::now():
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start
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};
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const auto elapsed
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{
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duration_cast<decltype(accumulator)>(now - start)
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};
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const auto accumulator
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{
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this->accumulator + elapsed
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};
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return duration_cast<duration>(accumulator);
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}
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inline bool
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ircd::util::timer::stopped()
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const
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{
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return start == clock::time_point::min();
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}
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