15 #ifndef DISTANCEUNIT_H 16 #define DISTANCEUNIT_H 18 #include "pandatoolbase.h" 39 string format_abbrev_unit(DistanceUnit unit);
40 string format_long_unit(DistanceUnit unit);
42 ostream &operator << (ostream &out, DistanceUnit unit);
43 istream &operator >> (istream &in, DistanceUnit &unit);
44 DistanceUnit string_distance_unit(
const string &str);
46 double convert_units(DistanceUnit from, DistanceUnit to);