Method get_walltime

src/client/timer.hpp:32–39

private:
  inline double get_walltime()
  {
    struct timespec ts;

    clock_gettime(CLOCK_REALTIME, &ts);
    return static_cast<double>(ts.tv_sec) +
      static_cast<double>(ts.tv_nsec) * 1.0e-9;
  }

private:
  double init_time_;