41#if !defined(DISABLE_PREDEFINED_UNITS) || \
42 defined(ENABLE_PREDEFINED_CONCENTRATION_UNITS)
43UNIT_ADD(concentration, ppm, parts_per_million, ppm,
46 unit<
std::ratio<1, 1000>, parts_per_million>)
47UNIT_ADD(concentration, ppt, parts_per_trillion, ppt,
55using namespace concentration;
#define UNIT_ADD_CATEGORY_TRAIT(unitCategory)
Macro to create the is_category_unit type trait.
Definition: base.h:381
Definition: StdDeque.h:50
base_unit scalar_unit
Represents a quantity with no dimension.
Definition: base.h:791
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
unit< std::ratio< 1, 1000 >, parts_per_million > percent
Definition: concentration.h:49
ppb
Definition: concentration.h:45
unit< std::ratio< 1, 1000 >, parts_per_million > pct
Definition: concentration.h:49
parts_per_billion
Definition: concentration.h:45
Class representing SI base unit types.
Definition: base.h:758
Type representing an arbitrary unit.
Definition: base.h:884