timer-util.h

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/*
 * =====================================================================================
 *
 *       Filename:  timer.h
 *
 *    Description:  Timer utils. 
 *
 *         Author:  Milan Kabat, kabat@ics.muni.cz
 *
 * =====================================================================================
 */
 
#ifndef  TIMER_INC
#define  TIMER_INC
 
#include <chrono>
 
#if defined __GNUC__ && __GNUC__ == 4 && __GNUC_MINOR__ == 6 // compat, GCC 4.6 didn't have steady_clock
#define steady_clock system_clock
#endif
 
class Timer_util
{
    private:
         std::chrono::time_point<std::chrono::steady_clock> start_time;
         std::chrono::time_point<std::chrono::steady_clock> end_time;
 
    public:
         inline void start() {
             start_time = std::chrono::steady_clock::now();
         }
 
         inline void end() {
             end_time = std::chrono::steady_clock::now();
         }
 
        inline double
            elapsed_time () const
            {
                return std::chrono::duration_cast<std::chrono::duration<double>>(end_time - start_time).count();
            }
 
        inline double
            elapsed_time_ms () const
            {
                return std::chrono::duration_cast<std::chrono::duration<double, std::milli>>(end_time - start_time).count();
            }
 
        inline long
            elapsed_time_us () const
            {
                return std::chrono::duration_cast<std::chrono::duration<long, std::micro>>(end_time - start_time).count();
            }
}; /*  -----  end of class Timer_util  ----- */
 
#endif   /* ----- #ifndef TIMER_INC  ----- */