TimeDelta(): usec(0) { }
/** Constructs a TimeDelta from a plain number. The purpose of this is to
- allow serialization together with the raw() function. For creating
- TimeDeltas with a specific length, see units.h. */
+ allow serialization together with the raw() function. */
explicit TimeDelta(RawTime u): usec(u) { }
/** Returns the raw number stored inside the TimeDelta. This should only be used