Here is a list of all documented file members with links to the documentation:

UNIT_ADD : units.h
UNIT_ADD_CATEGORY_TRAIT : units.h
UNIT_ADD_CUSTOM_TYPE_UNIT_DEFINITION : units.h
UNIT_ADD_DECIBEL : units.h
UNIT_ADD_IO : units.h
UNIT_ADD_LITERALS : units.h
UNIT_ADD_NAME : units.h
UNIT_ADD_UNIT_DEFINITION : units.h
UNIT_ADD_UNIT_TAGS : units.h
UNIT_ADD_WITH_CUSTOM_TYPE : units.h
UNIT_ADD_WITH_METRIC_AND_BINARY_PREFIXES : units.h
UNIT_ADD_WITH_METRIC_PREFIXES : units.h