event_clock.h

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#ifndef ED_EVENT_CLOCK_H_
#define ED_EVENT_CLOCK_H_
 
#include <sys/time.h>
 
namespace ed
{
 
class EventClock
{
public:
 
    EventClock() : cycle_duration_(0), t_last_trigger_(0) {}
 
    EventClock(double freq) : cycle_duration_(1.0 / freq), t_last_trigger_(0) {}
 
    bool triggers()
    {
        struct timeval now;
        gettimeofday(&now, NULL);
 
        double t_secs = now.tv_sec + now.tv_usec / 1e6;
        if ((t_secs - t_last_trigger_) > cycle_duration_)
        {
            t_last_trigger_ = t_secs;
            return true;
        }
        return false;
    }
 
private:
    double cycle_duration_;
    double t_last_trigger_;
};
 
}
 
#endif