110 lines
2.4 KiB
C++
110 lines
2.4 KiB
C++
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/*
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The Capo Library
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Code covered by the MIT License
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Author: mutouyun (http://orzz.org)
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*/
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#pragma once
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#include <chrono> // std::chrono
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#include <array> // std::array
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#include <utility> // std::pair, std::declval
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#include <cstddef> // size_t
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namespace capo {
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////////////////////////////////////////////////////////////////
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/// Stopwatch - can store multiple sets of time
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////////////////////////////////////////////////////////////////
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template <size_t CountN = 1, class ClockT = std::chrono::steady_clock>
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class stopwatch : public ClockT
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{
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using base_t = ClockT;
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static_assert(CountN > 0, "The count must be greater than 0");
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public:
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using rep = typename ClockT::rep;
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using period = typename ClockT::period;
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using duration = typename ClockT::duration;
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using time_point = typename ClockT::time_point;
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private:
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using pair_t = std::pair<time_point/*start*/, time_point/*paused*/>;
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std::array<pair_t, CountN> points_;
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bool is_stopped_ = true;
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public:
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stopwatch(bool start_watch = false)
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{
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if (start_watch) start();
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}
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public:
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bool is_stopped(void) const
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{
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return is_stopped_;
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}
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template <size_t N = 0>
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bool is_paused(void) const
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{
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return (points_[N].second != points_[N].first);
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}
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template <size_t N = 0>
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duration elapsed(void)
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{
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if (is_stopped())
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return duration::zero();
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else
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if (is_paused<N>())
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return (points_[N].second - points_[N].first);
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else
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return ClockT::now() - points_[N].first;
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}
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template <typename ToDur, size_t N = 0>
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auto elapsed(void) -> decltype(std::declval<ToDur>().count())
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{
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return std::chrono::duration_cast<ToDur>(elapsed<N>()).count();
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}
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template <size_t N = 0>
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void pause(void)
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{
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points_[N].second = ClockT::now();
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}
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template <size_t N = 0>
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void restart(void)
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{
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points_[N].second = points_[N].first =
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ClockT::now() - (points_[N].second - points_[N].first);
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}
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void start(void)
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{
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time_point now = ClockT::now();
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for (auto& pt : points_)
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{
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pt.second = pt.first = now - (pt.second - pt.first);
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}
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is_stopped_ = false;
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}
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void stop(void)
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{
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for (auto& pt : points_)
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{
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pt.second = pt.first;
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}
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is_stopped_ = true;
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}
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};
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} // namespace capo
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