bool rt_safe_earliest_event (double start, double& x, double& y, bool start_inclusive=false) const;
bool rt_safe_earliest_event_unlocked (double start, double& x, double& y, bool start_inclusive=false) const;
bool rt_safe_earliest_event (double start, double& x, double& y, bool start_inclusive=false) const;
bool rt_safe_earliest_event_unlocked (double start, double& x, double& y, bool start_inclusive=false) const;