40#if !defined(DISABLE_PREDEFINED_UNITS) || \
41 defined(ENABLE_PREDEFINED_SUBSTANCE_UNITS)
48using namespace substance;
#define UNIT_ADD_CATEGORY_TRAIT(unitCategory)
Macro to create the is_category_unit type trait.
Definition: base.h:381
Unit Conversion Library namespace.
Definition: current.h:31
UNIT_ADD(area, square_meter, square_meters, sq_m, unit< std::ratio< 1 >, units::category::area_unit >) UNIT_ADD(area
Class representing SI base unit types.
Definition: base.h:758
Type representing an arbitrary unit.
Definition: base.h:884