Crate qtty

Expand description

Strongly typed physical quantities and conversions.

qtty is the user-facing crate in this workspace. It re-exports the full API from qtty-core plus a curated set of predefined units (time, angles, lengths, …).

The core idea is: a value is always a Quantity<U, S>, where U is a zero-sized type describing the unit and S is the scalar type (defaults to f64). This keeps units at compile time with no runtime overhead beyond the scalar’s size.

§What this crate solves

Prevents mixing incompatible dimensions (you can’t add metres to seconds).
Makes unit conversion explicit and type-checked (to::<TargetUnit>()).
Provides a small set of astronomy-friendly units (AU, light-year, solar mass/luminosity, …).
Supports multiple scalar types (f64, f32, and optionally Decimal, Rational64, etc.).

§What this crate does not try to solve

Arbitrary symbolic unit algebra (e.g. m^2 * s^-1) or automatic simplification of arbitrary expressions.
A full SI-prefix system; only the units defined in this crate are available out of the box.

§Quick start

Convert degrees to radians:

use qtty::{Degrees, Radian};

let a = Degrees::new(180.0);
let r = a.to::<Radian>();
assert!((r.value() - core::f64::consts::PI).abs() < 1e-12);

Compose and use derived units (velocity = length / time):

use qtty::{Kilometer, Kilometers, Second, Seconds};
use qtty::velocity::Velocity;

let d = Kilometers::new(1_000.0);
let t = Seconds::new(100.0);
let v: Velocity<Kilometer, Second> = d / t;
assert!((v.value() - 10.0).abs() < 1e-12);

Using f32 for memory efficiency:

use qtty::f32::{Degrees, Meters};

let angle: Degrees = Degrees::new(45.0_f32);
let distance: Meters = Meters::new(100.0_f32);

§Incorrect usage (type error)

use qtty::{Kilometers, Seconds};

let d = Kilometers::new(1.0);
let t = Seconds::new(1.0);
let _ = d + t; // cannot add different unit types

§Scalar Types

The default scalar type is f64. You can use different scalar types:

f64 (default) - double precision floating point
f32 - single precision floating point (use qtty::f32::*)
i8, i16, i32, i64, i128 - signed integers (use qtty::i8::*, qtty::i16::*, qtty::i32::*, qtty::i64::*, qtty::i128::*)
Decimal - exact decimal (feature scalar-decimal)
Rational64 - exact rational (feature scalar-rational)

Integer quantities provide compile-time unit safety for discrete values. They support basic arithmetic and lossy unit conversion via to_lossy(), but not the full to() method (which requires floating-point semantics).

§Modules

Units are grouped by dimension under modules (also re-exported at the crate root for convenience):

qtty::angular (degrees, radians, arcseconds, wrapping/trigonometry helpers)
qtty::time (seconds, days, years, …)
qtty::length (metres, kilometres, AU, light-year, …)
qtty::mass (grams, kilograms, solar mass)
qtty::power (watts, solar luminosity)
qtty::velocity (Length / Time aliases)
qtty::frequency (Angular / Time aliases)
qtty::f32 (all units with f32 scalar)
qtty::f64 (all units with f64 scalar - same as root)
qtty::i8 (all units with i8 scalar)
qtty::i16 (all units with i16 scalar)
qtty::i32 (all units with i32 scalar)
qtty::i64 (all units with i64 scalar)
qtty::i128 (all units with i128 scalar)

§Feature flags

std (default): enables std support in qtty-core.
cross-unit-ops (default): enables direct cross-unit comparison operators (==, <, etc.) for built-in units.
alloc: enables heap-backed helpers (like qtty_vec!(vec ...)) in no_std builds.
serde: enables serde support for Quantity<U>; serialization is the raw f64 value only.
scalar-decimal: enables rust_decimal::Decimal as a scalar type.
scalar-rational: enables num_rational::Rational64 as a scalar type.

Disable default features for no_std:

[dependencies]
qtty = { version = "0.2.0", default-features = false }

If you need qtty_vec!(vec ...) in no_std, enable alloc:

[dependencies]
qtty = { version = "0.2.0", default-features = false, features = ["alloc"] }

§Panics and errors

This crate does not define an error type and does not return Result from its core operations. Conversions and arithmetic are pure computations; they do not panic on their own, but they follow IEEE-754 behavior for floats (NaN and infinities propagate according to the underlying operation).

§SemVer and stability

This workspace is currently 0.x. Expect breaking changes between minor versions until 1.0.

Modules§

angular: Angular quantities and utilities.
area: Area units.
f32: Re-exports of quantity types specialized to f32 scalar.
f64: Re-exports of quantity types specialized to f64 scalar (default).
frequency: Angular frequency unit aliases (Angular / Time).
i8: Re-exports of quantity types specialized to i8 scalar.
i16: Re-exports of quantity types specialized to i16 scalar.
i32: Re-exports of quantity types specialized to i32 scalar.
i64: Re-exports of quantity types specialized to i64 scalar.
i128: Re-exports of quantity types specialized to i128 scalar.
length: Length units.
mass: Mass units.
nominal: Nominal astronomical and planetary radii and related distances.
power: Power units.
scalar: Scalar traits for quantity values.
time: Time units.
unitless: Dimensionless helpers.
units: Predefined unit modules (grouped by dimension).
velocity: Velocity unit aliases (Length / Time).
volume: Volume units.

Macros§

impl_unit_conversions: Generates all pairwise conversions and cross-unit comparisons.
impl_unit_cross_unit_ops: Generates cross-unit PartialEq and PartialOrd implementations for all pairs of units.
impl_unit_from_conversions: Generates bidirectional From trait implementations for all pairs of units within a dimension.
qtty_vec: Build typed quantities from scalar literals without repeating Unit::new(...).

Structs§

Acre: Acre (exactly 4046.8564224 m²).
Arcminute: Arcminute (1/60 degree).
Arcsecond: Arcsecond (1/3600 degree).
Are: Are (100 m²).
AstronomicalUnit: Astronomical unit (au). Exact (IAU 2012): metres per au.
AtomicMassUnit: Unified atomic mass unit (u), a.k.a. dalton (Da).
Attogram: SI mass unit Attogram with gram-based prefix (symbol ag). By definition, 1 ag = 1e-18 g.
Attometer: Attometre (1e-18 m).
Attosecond: Attoseconds (1 as = 10^-18 s).
Attowatt: SI-prefixed watt unit (1e-18 W).
BohrRadius: Bohr radius (a0). CODATA 2018 value in metres.
Carat: Carat: 1 ct = 0.2 g (exact).
Centigram: SI mass unit Centigram with gram-based prefix (symbol cg). By definition, 1 cg = 1e-2 g.
Centiliter: Centilitre (1e-5 m³, exact).
Centimeter: Centimetre (1e-2 m).
Centisecond: Centiseconds (1 cs = 10^-2 s).
Century: Century (100 mean tropical years).
Chain: Chain (66 ft exactly).
ClassicalElectronRadius: Classical electron radius (re). CODATA 2018 value in metres.
CubicCentimeter: Cubic centimetre (1e-6 m³).
CubicFoot: Cubic foot (0.028316846592 m³, exact: 0.3048³ m³).
CubicInch: Cubic inch (1.6387064e-5 m³, exact: 0.0254³ m³).
CubicKilometer: Cubic kilometre (1e9 m³).
CubicMeter: Cubic metre (SI derived unit of volume).
CubicMillimeter: Cubic millimetre (1e-9 m³).
Day: Mean solar day (86_400 s by convention; leap seconds ignored).
Decade: Decade (10 mean tropical years).
Decagram: SI mass unit Decagram with gram-based prefix (symbol dag). By definition, 1 dag = 1e1 g.
Decameter: Decametre (1e1 m).
Decasecond: Decaseconds (1 das = 10 s).
Decawatt: SI-prefixed watt unit (1e1 W).
Decigram: SI mass unit Decigram with gram-based prefix (symbol dg). By definition, 1 dg = 1e-1 g.
Deciliter: Decilitre (1e-4 m³, exact).
Decimeter: Decimetre (1e-1 m).
Decisecond: Deciseconds (1 ds = 10^-1 s).
Deciwatt: SI-prefixed watt unit (1e-1 W).
Degree: Degree.
Dim: A physical dimension encoded as eight typenum integer exponents.
EarthEquatorialCircumference: Earth equatorial circumference.
EarthMeridionalCircumference: Earth meridional circumference (approximate mean value).
ElectronReducedComptonWavelength: Reduced Compton wavelength of the electron (lambda_bar_e). CODATA 2018 value in metres.
ErgPerSecond: Erg per second (erg/s).
Exagram: SI mass unit Exagram with gram-based prefix (symbol Eg). By definition, 1 Eg = 1e18 g.
Exameter: Exametre (1e18 m).
Exawatt: SI-prefixed watt unit (1e18 W).
Fathom: Fathom (6 ft exactly).
Femtogram: SI mass unit Femtogram with gram-based prefix (symbol fg). By definition, 1 fg = 1e-15 g.
Femtometer: Femtometre (1e-15 m).
Femtosecond: Femtoseconds (1 fs = 10^-15 s).
Femtowatt: SI-prefixed watt unit (1e-15 W).
Foot: Foot (0.3048 m exactly).
Fortnight: Fortnight (14 d = 1_209_600 s).
Gigagram: SI mass unit Gigagram with gram-based prefix (symbol Gg). By definition, 1 Gg = 1e9 g.
Gigameter: Gigametre (1e9 m).
Gigaparsec: Gigaparsec (Gpc): 1e9 pc.
Gigasecond: Gigaseconds (1 Gs = 10^9 s).
Gigawatt: SI-prefixed watt unit (1e9 W).
Gradian: Gradian (also called gon; 1/400 of a full turn = 0.9 degree).
Grain: Grain: 1 gr = 64.79891 mg (exact) == 0.064_798_91 g.
Gram: Gram.
Hectare: Hectare (10 000 m²).
Hectogram: SI mass unit Hectogram with gram-based prefix (symbol hg). By definition, 1 hg = 1e2 g.
Hectometer: Hectometre (1e2 m).
Hectosecond: Hectoseconds (1 hs = 100 s).
Hectowatt: SI-prefixed watt unit (1e2 W).
HorsepowerElectric: Electric horsepower (hp_e), defined as exactly 746 W.
HorsepowerMetric: Metric horsepower (PS), defined as exactly 735.49875 W.
Hour: Hours (3_600 s).
HourAngle: Hour angle hour (15 degrees).
Inch: Inch (0.0254 m exactly).
JulianCentury: Julian century (36_525 d), expressed in seconds.
JulianYear: Julian year (365.25 d), expressed in seconds.
Kilogram: SI mass unit Kilogram with gram-based prefix (symbol kg). By definition, 1 kg = 1e3 g.
Kilometer: Kilometre (1000 m).
Kiloparsec: Kiloparsec (kpc): 1e3 pc.
Kilosecond: Kiloseconds (1 ks = 1_000 s).
Kilowatt: SI-prefixed watt unit (1e3 W).
LightYear: Light-year (ly): distance light travels in one Julian year (365.25 d) at c = 299_792_458 m/s.
Link: Link (1/100 of a chain, i.e. 0.66 ft).
Liter: Litre (1e-3 m³, exact).
LongTon: Long ton (Imperial): 2240 lb (exact given lb).
Megagram: SI mass unit Megagram with gram-based prefix (symbol Mg). By definition, 1 Mg = 1e6 g.
Megameter: Megametre (1e6 m).
Megaparsec: Megaparsec (Mpc): 1e6 pc.
Megasecond: Megaseconds (1 Ms = 10^6 s).
Megawatt: SI-prefixed watt unit (1e6 W).
Meter: Metre (SI base unit).
MicroArcsecond: Microarcsecond (1/3_600_000_000 degree).
Microgram: SI mass unit Microgram with gram-based prefix (symbol µg). By definition, 1 µg = 1e-6 g.
Microliter: Microlitre (1e-9 m³, exact).
Micrometer: Micrometre (1e-6 m).
Microsecond: Microseconds (1 µs = 10^-6 s).
Microwatt: SI-prefixed watt unit (1e-6 W).
Mile: (Statute) mile (1609.344 m exactly).
Millennium: Millennium (1000 mean tropical years).
MilliArcsecond: Milliarcsecond (1/3_600_000 degree).
Milligram: SI mass unit Milligram with gram-based prefix (symbol mg). By definition, 1 mg = 1e-3 g.
Milliliter: Millilitre (1e-6 m³, exact).
Millimeter: Millimetre (1e-3 m).
Milliradian: Milliradian (1/1000 radian).
Millisecond: Milliseconds (1 ms = 10^-3 s).
Milliwatt: SI-prefixed watt unit (1e-3 W).
Minute: Minutes (60 s).
Nanogram: SI mass unit Nanogram with gram-based prefix (symbol ng). By definition, 1 ng = 1e-9 g.
Nanometer: Nanometre (1e-9 m).
Nanosecond: Nanoseconds (1 ns = 10^-9 s).
Nanowatt: SI-prefixed watt unit (1e-9 W).
NauticalMile: Nautical mile (1852 m exactly).
Ounce: Avoirdupois ounce: 1 oz = 1/16 lb (exact).
Parsec: Parsec (pc): pc = au * 648000 / π (exact given au).
Per: Unit representing the division of two other units.
Petagram: SI mass unit Petagram with gram-based prefix (symbol Pg). By definition, 1 Pg = 1e15 g.
Petameter: Petametre (1e15 m).
Petawatt: SI-prefixed watt unit (1e15 W).
Picogram: SI mass unit Picogram with gram-based prefix (symbol pg). By definition, 1 pg = 1e-12 g.
Picometer: Picometre (1e-12 m).
Picosecond: Picoseconds (1 ps = 10^-12 s).
Picowatt: SI-prefixed watt unit (1e-12 W).
PlanckLength: Planck length (lp). CODATA 2018 value in metres.
Pound: Avoirdupois pound: 1 lb = 0.45359237 kg (exact) == 453.59237 g.
Prod: Unit representing the product of two other units.
Quantity: A quantity with a specific unit and scalar type.
Radian: Radian.
Rod: Rod / pole / perch (16.5 ft exactly).
Second: Seconds (SI base unit).
ShortTon: Short ton (US customary): 2000 lb (exact given lb).
SiderealDay: Mean sidereal day (Earth), expressed in SI seconds.
SiderealYear: Mean sidereal year (Earth), expressed in seconds.
SolarLuminosity: Solar luminosity (IAU nominal constant; watts per L☉).
SolarMass: Nominal solar mass (IAU 2015 Resolution B3; grams per M☉).
SquareCentimeter: Square centimetre (1e-4 m²).
SquareFoot: Square foot (0.09290304 m², exact: 0.3048² m²).
SquareInch: Square inch (6.4516e-4 m², exact: 0.0254² m²).
SquareKilometer: Square kilometre (1e6 m²).
SquareMeter: Square metre (SI derived unit of area).
SquareMile: Square mile (2_589_988.110336 m², exact: 1609.344² m²).
SquareMillimeter: Square millimetre (1e-6 m²).
SquareYard: Square yard (0.83612736 m², exact: 0.9144² m²).
Stone: Avoirdupois stone: 1 st = 14 lb (exact).
SynodicMonth: Mean synodic month (lunar phase cycle), expressed in seconds.
Teragram: SI mass unit Teragram with gram-based prefix (symbol Tg). By definition, 1 Tg = 1e12 g.
Terameter: Terametre (1e12 m).
Terasecond: Teraseconds (1 Ts = 10^12 s).
Terawatt: SI-prefixed watt unit (1e12 W).
Tonne: Tonne (metric ton): 1 t = 1_000_000 g (exact).
Turn: Turn (full revolution; 360 degrees).
Unitless: Zero-sized marker type for dimensionless quantities.
UsFluidOunce: US fluid ounce (2.95735295625e-5 m³, exact: gal / 128).
UsGallon: US liquid gallon (0.003785411784 m³, exact: 231 in³).
Watt: Watt (SI coherent derived unit).
Week: Week (7 d = 604_800 s).
Yard: Yard (0.9144 m exactly).
Year: Mean tropical year, as a conventional mean length.
Yoctogram: SI mass unit Yoctogram with gram-based prefix (symbol yg). By definition, 1 yg = 1e-24 g.
Yoctometer: Yoctometre (1e-24 m).
Yoctowatt: SI-prefixed watt unit (1e-24 W).
Yottagram: SI mass unit Yottagram with gram-based prefix (symbol Yg). By definition, 1 Yg = 1e24 g.
Yottameter: Yottametre (1e24 m).
Yottawatt: SI-prefixed watt unit (1e24 W).
Zeptogram: SI mass unit Zeptogram with gram-based prefix (symbol zg). By definition, 1 zg = 1e-21 g.
Zeptometer: Zeptometre (1e-21 m).
Zeptowatt: SI-prefixed watt unit (1e-21 W).
Zettagram: SI mass unit Zettagram with gram-based prefix (symbol Zg). By definition, 1 Zg = 1e21 g.
Zettameter: Zettametre (1e21 m).
Zettawatt: SI-prefixed watt unit (1e21 W).

Constants§

A0: One Bohr radius.
AG: Constant equal to one Attogram (1 ag).
AM: One attometre.
ARCM: One arcminute.
ARCS: One arcsecond.
ATTOSEC: A constant representing one attosecond.
AU: One astronomical unit.
AW: One Attowatt.
CENTISEC: A constant representing one centisecond.
CENTURY: A constant representing one century.
CG: Constant equal to one Centigram (1 cg).
CHAIN: One chain.
CM: One centimetre.
CT: One carat.
C_EQUATORIAL: One Earth equatorial circumference.
C_MERIDIONAL: One Earth meridional circumference.
DAG: Constant equal to one Decagram (1 dag).
DAM: One decametre.
DAW: One Decawatt.
DAY: A constant representing one day.
DECADE: A constant representing one decade.
DECASEC: A constant representing one decasecond.
DECISEC: A constant representing one decisecond.
DEG: One degree.
DG: Constant equal to one Decigram (1 dg).
DM: One decimetre.
DW: One Deciwatt.
EG: Constant equal to one Exagram (1 Eg).
EM: One exametre.
ERG_PER_S: One erg/s.
EW_1: One Exawatt.
FEMTOSEC: A constant representing one femtosecond.
FG: Constant equal to one Femtogram (1 fg).
FM: One femtometre.
FORTNIGHT: A constant representing one fortnight.
FT: One foot.
FTM: One fathom.
FW: One Femtowatt.
G: One gram.
GG: Constant equal to one Gigagram (1 Gg).
GIGASEC: A constant representing one gigasecond.
GM: One gigametre.
GON: One gradian.
GPC: One gigaparsec.
GR: One grain.
GW_1: One Gigawatt.
HECTOSEC: A constant representing one hectosecond.
HG: Constant equal to one Hectogram (1 hg).
HM: One hectometre.
HOUR: A constant representing one hour.
HOUR_ANGLE: One hour angle hour (==15°).
HP_E: One electric horsepower.
HW: One Hectowatt.
INCH: One inch.
JULIAN_CENTURY: A constant representing one Julian century.
JULIAN_YEAR: A constant representing one Julian year.
KG: Constant equal to one Kilogram (1 kg).
KILOSEC: A constant representing one kilosecond.
KM: One kilometre.
KPC: One kiloparsec.
KW: One Kilowatt.
LAMBDA_BAR_E: One reduced Compton wavelength of the electron.
LB: One pound.
LINK: One link.
LP: One Planck length.
LY: One light-year.
L_SUN: One solar luminosity.
M: One metre.
MAS: One milliarcsecond.
MEGAGRAM: Constant equal to one Megagram (1 Mg).
MEGAMETER: One megametre.
MEGASEC: A constant representing one megasecond.
MEGAWATT: One Megawatt.
MG: Constant equal to one Milligram (1 mg).
MI: One mile.
MICROSEC: A constant representing one microsecond.
MILLENNIUM: A constant representing one millennium.
MILLISEC: A constant representing one millisecond.
MIN: A constant representing one minute.
MM: One millimetre.
MPC: One megaparsec.
MRAD: One milliradian.
MSUN: One nominal solar mass.
MW_1: One Milliwatt.
NANOSEC: A constant representing one nanosecond.
NG: Constant equal to one Nanogram (1 ng).
NM: One nanometre.
NMI: One nautical mile.
NW: One Nanowatt.
OZ: One ounce.
PC: One parsec.
PETAGRAM: Constant equal to one Petagram (1 Pg).
PETAWATT: One Petawatt.
PG: Constant equal to one Picogram (1 pg).
PICOSEC: A constant representing one picosecond.
PM: One petametre.
PMETER: One picometre.
PS: One metric horsepower.
PW: One Picowatt.
RAD: One radian.
RE: One classical electron radius.
ROD: One rod.
SEC: A constant representing one second.
SECONDS_PER_DAY: Conventional civil mapping used by this module: seconds per mean solar day.
SIDEREAL_DAY: A constant representing one sidereal day.
SIDEREAL_YEAR: A constant representing one sidereal year.
ST: One stone.
SYNODIC_MONTH: A constant representing one synodic month.
TERASEC: A constant representing one terasecond.
TG: Constant equal to one Teragram (1 Tg).
TM: One terametre.
TONE: One metric tonne.
TON_UK: One long ton (UK).
TON_US: One short ton (US).
TURN: One turn.
TW_1: One Terawatt.
U: One atomic mass unit.
UAS: One microarcsecond.
UG: Constant equal to one Microgram (1 µg).
UM: One micrometre.
UW: One Microwatt.
WATT: One watt.
WEEK: A constant representing one week.
YD: One yard.
YEAR: A constant representing one year.
YG: Constant equal to one Yoctogram (1 yg).
YM: One yottametre.
YMETER: One yoctometre.
YOTTAGRAM: Constant equal to one Yottagram (1 Yg).
YW: One Yoctowatt.
YW_1: One Yottawatt.
ZETTAGRAM: Constant equal to one Zettagram (1 Zg).
ZG: Constant equal to one Zeptogram (1 zg).
ZM: One zettametre.
ZMETER: One zeptometre.
ZW: One Zeptowatt.
ZW_1: One Zettawatt.

Traits§

AngularUnit: Blanket extension trait for any Unit whose dimension is Angular.
AreaUnit: Marker trait for any Unit whose dimension is Area.
DimDiv: Trait for dividing two dimensions (subtracts exponents).
DimMul: Trait for multiplying two dimensions (adds exponents).
Dimension: Marker trait for dimensions.
Exact: Trait for exact numeric types that avoid floating-point rounding.
FrequencyUnit: Marker trait for any unit with frequency dimension (Angular / Time).
IntegerScalar: Marker trait for integer scalar types.
LengthUnit: Marker trait for any Unit whose dimension is Length.
MassUnit: Marker trait for any Unit whose dimension is Mass.
PowerUnit: Marker trait for power units.
Real: Trait for scalar types that support real-number operations.
Scalar: The base trait for all scalar types usable in Quantity.
Simplify: Trait for simplifying composite unit types.
TimeUnit: Marker trait for any Unit whose dimension is Time.
Transcendental: Trait for scalar types that support transcendental (trigonometric) functions.
Unit: Trait implemented by every unit type.
VelocityUnit: Marker trait for any unit whose dimension is VelocityDim.
VolumeUnit: Marker trait for any Unit whose dimension is Volume.

Type Aliases§

Acceleration: Acceleration (L¹ · T⁻²).
Acres: A quantity measured in acres.
Ag: Shorthand alias for Attogram.
AmountOfSubstance: Amount of substance (N¹).
Angular: Plane angle (A¹) — treated as an independent dimension for type safety.
Arcm: Type alias shorthand for Arcminute.
Arcminutes: Convenience alias for an arcminute quantity.
Arcs: Type alias shorthand for Arcsecond.
Arcseconds: Convenience alias for an arcsecond quantity.
Area: Area (L²).
Ares: A quantity measured in ares.
AstronomicalUnits: A quantity measured in astronomical units.
AtomicMassUnits: Quantity measured in atomic mass units.
Attograms: Quantity measured in Attogram (ag).
Attometers: A quantity measured in attometres.
Attoseconds: A quantity measured in attoseconds.
Attowatts: A quantity measured in Attowatts.
Au: Type alias shorthand for AstronomicalUnit.
Aw: Type alias shorthand for Attowatt.
BohrRadii: A quantity measured in Bohr radii.
Carats: Quantity measured in carats.
Centigrams: Quantity measured in Centigram (cg).
Centiliters: A quantity measured in centilitres.
Centimeters: A quantity measured in centimetres.
Centiseconds: A quantity measured in centiseconds.
Centuries: A quantity measured in centuries.
Cg: Shorthand alias for Centigram.
Chains: A quantity measured in chains.
ClassicalElectronRadii: A quantity measured in classical electron radii.
Cm: Type alias shorthand for Centimeter.
Ct: Shorthand type alias for Carat.
CubicCentimeters: A quantity measured in cubic centimetres.
CubicFeet: A quantity measured in cubic feet.
CubicInches: A quantity measured in cubic inches.
CubicKilometers: A quantity measured in cubic kilometres.
CubicMeters: A quantity measured in cubic metres.
CubicMillimeters: A quantity measured in cubic millimetres.
Current: Electric current (I¹).
Dag: Shorthand alias for Decagram.
Dalton: Type alias shorthand for AtomicMassUnit.
Daw: Type alias shorthand for Decawatt.
Days: A quantity measured in days.
Decades: A quantity measured in decades.
Decagrams: Quantity measured in Decagram (dag).
Decameters: A quantity measured in decametres.
Decaseconds: A quantity measured in decaseconds.
Decawatts: A quantity measured in Decawatts.
Decigrams: Quantity measured in Decigram (dg).
Deciliters: A quantity measured in decilitres.
Decimeters: A quantity measured in decimetres.
Deciseconds: A quantity measured in deciseconds.
Deciwatts: A quantity measured in Deciwatts.
Deg: Type alias shorthand for Degree.
Degrees: Convenience alias for a degree quantity.
Dg: Shorthand alias for Decigram.
Dimensionless: Dimensionless (all exponents zero).
DivDim: Backward-compatible alias: DivDim<N, D> resolves to <N as DimDiv<D>>::Output.
Dw: Type alias shorthand for Deciwatt.
EW: Type alias shorthand for Exawatt.
EarthEquatorialCircumferences: A quantity measured in Earth equatorial circumferences.
EarthMeridionalCircumferences: A quantity measured in Earth meridional circumferences.
Eg: Shorthand alias for Exagram.
ElectronReducedComptonWavelengths: A quantity measured in reduced Compton wavelengths of the electron.
Energy: Energy (M¹ · L² · T⁻²).
Exagrams: Quantity measured in Exagram (Eg).
Exameters: A quantity measured in exametres.
Exawatts: A quantity measured in Exawatts.
Fathoms: A quantity measured in fathoms.
Feet: A quantity measured in feet.
Femtograms: Quantity measured in Femtogram (fg).
Femtometers: A quantity measured in femtometres.
Femtoseconds: A quantity measured in femtoseconds.
Femtowatts: A quantity measured in Femtowatts.
Fg: Shorthand alias for Femtogram.
Force: Force (M¹ · L¹ · T⁻²).
Fortnights: A quantity measured in fortnights.
Frequency: A frequency quantity parameterized by angular and time units.
FrequencyDim: Frequency — angular per time (A¹ · T⁻¹).
Fw: Type alias shorthand for Femtowatt.
GW: Type alias shorthand for Gigawatt.
Gg: Shorthand alias for Gigagram.
Gigagrams: Quantity measured in Gigagram (Gg).
Gigameters: A quantity measured in gigametres.
Gigaparsecs: A quantity measured in gigaparsecs.
Gigaseconds: A quantity measured in gigaseconds.
Gigawatts: A quantity measured in Gigawatts.
Gon: Type alias shorthand for Gradian.
Gr: Shorthand type alias for Grain.
Gradians: Convenience alias for a gradian quantity.
Grains: Quantity measured in grains.
Grams: A quantity measured in grams.
Hectares: A quantity measured in hectares.
Hectograms: Quantity measured in Hectogram (hg).
Hectometers: A quantity measured in hectometres.
Hectoseconds: A quantity measured in hectoseconds.
Hectowatts: A quantity measured in Hectowatts.
Hg: Shorthand alias for Hectogram.
Hms: Type alias shorthand for HourAngle.
HorsepowerElectrics: A quantity measured in electric horsepower.
HorsepowerMetrics: A quantity measured in metric horsepower.
HourAngles: Convenience alias for an hour-angle quantity.
Hours: A quantity measured in hours.
Hw: Type alias shorthand for Hectowatt.
Inches: A quantity measured in inches.
JulianCenturies: A quantity measured in Julian centuries.
JulianYears: A quantity measured in Julian years.
Kg: Shorthand alias for Kilogram.
Kilograms: Quantity measured in Kilogram (kg).
Kilometers: A quantity measured in kilometres.
Kiloparsecs: A quantity measured in kiloparsecs.
Kiloseconds: A quantity measured in kiloseconds.
Kilowatts: A quantity measured in Kilowatts.
Km: Type alias shorthand for Kilometer.
Kw: Type alias shorthand for Kilowatt.
Lb: Shorthand type alias for Pound.
Length: Length (L¹).
LightYears: A quantity measured in light-years.
Links: A quantity measured in links.
Liters: A quantity measured in litres.
LongTons: Quantity measured in long tons (UK).
LuminousIntensity: Luminous intensity (J¹).
Ly: Type alias shorthand for LightYear.
MOA: Alias for Arcminute (minute of angle, MOA).
MW: Type alias shorthand for Megawatt.
Mas: Type alias shorthand for MilliArcsecond.
Mass: Mass (M¹).
MegaMeter: Type alias shorthand for Megameter.
Megagrams: Quantity measured in Megagram (Mg).
Megameters: A quantity measured in megametres.
Megaparsecs: A quantity measured in megaparsecs.
Megaseconds: A quantity measured in megaseconds.
Megawatts: A quantity measured in Megawatts.
Meters: A quantity measured in metres.
Mg: Shorthand alias for Milligram.
MgG: Shorthand alias for Megagram.
MicroArcseconds: Convenience alias for a microarcsecond quantity.
Micrograms: Quantity measured in Microgram (µg).
Microliters: A quantity measured in microlitres.
Micrometers: A quantity measured in micrometres.
Microseconds: A quantity measured in microseconds.
Microwatts: A quantity measured in Microwatts.
Miles: A quantity measured in miles.
Millennia: A quantity measured in millennia.
MilliArcseconds: Convenience alias for a milliarcsecond quantity.
Milligrams: Quantity measured in Milligram (mg).
Milliliters: A quantity measured in millilitres.
Millimeters: A quantity measured in millimetres.
Milliradians: Convenience alias for a milliradian quantity.
Milliseconds: A quantity measured in milliseconds.
Milliwatts: A quantity measured in Milliwatts.
Minutes: A quantity measured in minutes.
Mm: Type alias shorthand for Millimeter.
Mrad: Type alias shorthand for Milliradian.
MulDim: Backward-compatible alias: MulDim<A, B> resolves to <A as DimMul<B>>::Output.
Mw: Type alias shorthand for Milliwatt.
Nanograms: Quantity measured in Nanogram (ng).
Nanometers: A quantity measured in nanometres.
Nanoseconds: A quantity measured in nanoseconds.
Nanowatts: A quantity measured in Nanowatts.
NauticalMiles: A quantity measured in nautical miles.
Ng: Shorthand alias for Nanogram.
Nm: Type alias shorthand for Nanometer.
Nw: Type alias shorthand for Nanowatt.
Ounces: Quantity measured in ounces.
Oz: Shorthand type alias for Ounce.
PW: Type alias shorthand for Petawatt.
Parsecs: A quantity measured in parsecs.
Pc: Type alias shorthand for Parsec.
Petagrams: Quantity measured in Petagram (Pg).
Petameters: A quantity measured in petametres.
Petawatts: A quantity measured in Petawatts.
Pg: Shorthand alias for Picogram.
PgG: Shorthand alias for Petagram.
Picograms: Quantity measured in Picogram (pg).
Picometers: A quantity measured in picometres.
Picoseconds: A quantity measured in picoseconds.
Picowatts: A quantity measured in Picowatts.
PlanckLengths: A quantity measured in Planck lengths.
Pounds: Quantity measured in pounds.
Power: Power (M¹ · L² · T⁻³).
Pw: Type alias shorthand for Picowatt.
Quantity32: A quantity backed by f32.
Quantity64: A quantity backed by f64 (the default).
QuantityI8: A quantity backed by i8.
QuantityI16: A quantity backed by i16.
QuantityI32: A quantity backed by i32.
QuantityI64: A quantity backed by i64.
QuantityI128: A quantity backed by i128.
Rad: Type alias shorthand for Radian.
Radians: Convenience alias for a radian quantity.
Rods: A quantity measured in rods/poles/perches.
Seconds: A quantity measured in seconds.
ShortTons: Quantity measured in short tons (US).
SiderealDays: A quantity measured in sidereal days.
SiderealYears: A quantity measured in sidereal years.
SolarLuminosities: A quantity measured in solar luminosities.
SolarMasses: A quantity measured in solar masses.
SquareCentimeters: A quantity measured in square centimetres.
SquareFeet: A quantity measured in square feet.
SquareInches: A quantity measured in square inches.
SquareKilometers: A quantity measured in square kilometres.
SquareMeters: A quantity measured in square metres.
SquareMiles: A quantity measured in square miles.
SquareMillimeters: A quantity measured in square millimetres.
SquareYards: A quantity measured in square yards.
St: Shorthand type alias for Stone.
Stones: Quantity measured in stones.
SynodicMonths: A quantity measured in synodic months.
T: Shorthand type alias for Tonne.
TW: Type alias shorthand for Terawatt.
Temperature: Thermodynamic temperature (Θ¹).
Teragrams: Quantity measured in Teragram (Tg).
Terameters: A quantity measured in terametres.
Teraseconds: A quantity measured in teraseconds.
Terawatts: A quantity measured in Terawatts.
Tg: Shorthand alias for Teragram.
Time: Time (T¹).
Tonnes: Quantity measured in tonnes.
Turns: Convenience alias for a turn quantity.
Uas: Type alias shorthand for MicroArcsecond.
Ug: Shorthand alias for Microgram.
Um: Type alias shorthand for Micrometer.
UsFluidOunces: A quantity measured in US fluid ounces.
UsGallons: A quantity measured in US gallons.
Uw: Type alias shorthand for Microwatt.
Velocity: A velocity quantity parameterized by length and time units.
VelocityDim: Velocity (L¹ · T⁻¹).
Volume: Volume (L³).
W: Type alias shorthand for Watt.
Watts: A quantity measured in watts.
Weeks: A quantity measured in weeks.
YW: Type alias shorthand for Yottawatt.
Yards: A quantity measured in yards.
Years: A quantity measured in years.
Yg: Shorthand alias for Yoctogram.
YgG: Shorthand alias for Yottagram.
Yoctograms: Quantity measured in Yoctogram (yg).
Yoctometers: A quantity measured in yoctometres.
Yoctowatts: A quantity measured in Yoctowatts.
Yottagrams: Quantity measured in Yottagram (Yg).
Yottameters: A quantity measured in yottametres.
Yottawatts: A quantity measured in Yottawatts.
Yw: Type alias shorthand for Yoctowatt.
ZW: Type alias shorthand for Zettawatt.
Zeptograms: Quantity measured in Zeptogram (zg).
Zeptometers: A quantity measured in zeptometres.
Zeptowatts: A quantity measured in Zeptowatts.
Zettagrams: Quantity measured in Zettagram (Zg).
Zettameters: A quantity measured in zettametres.
Zettawatts: A quantity measured in Zettawatts.
Zg: Shorthand alias for Zeptogram.
ZgG: Shorthand alias for Zettagram.
Zw: Type alias shorthand for Zeptowatt.

Derive Macros§

Unit: Derive macro used by qtty-core to define unit marker types.

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§What this crate solves

§What this crate does not try to solve

§Quick start

§Incorrect usage (type error)

§Scalar Types

§Modules

§Feature flags

§Panics and errors

§SemVer and stability

Modules§

Macros§

Structs§

Constants§

Traits§

Type Aliases§

Derive Macros§

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