double tdiff(const timeval& a, const timeval& b);
bool less_than(const timeval &a, const timeval &b);
-timeval subtract_timeval_saturate(const timeval &a, const timeval &b);
+timeval subtract_timeval_saturate(const timeval &b, const timeval &a); // b - a
timeval offset_timeval_seconds(const timeval &a, double s);
#endif // !defined(_TIMEUTIL_H)