Cycle.hpp

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#ifndef _POWERDXX_TIMING_CYCLE_HPP_
#define _POWERDXX_TIMING_CYCLE_HPP_
 
#include <chrono>    /* std::chrono::steady_clock::now() */
#include <unistd.h>  /* usleep() */
 
namespace timing {
 
class Cycle {
    private:
    using clock = std::chrono::steady_clock;
 
    using us = std::chrono::microseconds;
 
    std::chrono::time_point<clock> clk = clock::now();
 
    public:
    bool operator ()() const {
        auto const remainingTime{
            std::chrono::duration_cast<us>(this->clk - clock::now())
        };
        auto const sleepDuration = remainingTime.count();
        return sleepDuration <= 0 || 0 == usleep(sleepDuration);
    }
 
    template <class... DurTraits>
    bool operator ()(std::chrono::duration<DurTraits...> const & cycleTime) {
        this->clk += cycleTime;
        return (*this)();
    }
 
};
 
} /* namespace timing */
 
#endif /* _POWERDXX_TIMING_CYCLE_HPP_ */