uom 0.38.0

Units of measurement
Documentation 
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//! Length (base unit meter, m).

quantity! {
    /// Length (base unit meter, m).
    quantity: Length; "length";
    /// Dimension of length, L (base unit meter, m).
    dimension: ISQ<
        P1,     // length
        Z0,     // mass
        Z0,     // time
        Z0,     // electric current
        Z0,     // thermodynamic temperature
        Z0,     // amount of substance
        Z0>;    // luminous intensity
    units {
        @yottameter: prefix!(yotta); "Ym", "yottameter", "yottameters";
        @zettameter: prefix!(zetta); "Zm", "zettameter", "zettameters";
        @exameter: prefix!(exa); "Em", "exameter", "exameters";
        @petameter: prefix!(peta); "Pm", "petameter", "petameters";
        @terameter: prefix!(tera); "Tm", "terameter", "terameters";
        @gigameter: prefix!(giga); "Gm", "gigameter", "gigameters";
        @megameter: prefix!(mega); "Mm", "megameter", "megameters";
        @kilometer: prefix!(kilo); "km", "kilometer", "kilometers";
        @hectometer: prefix!(hecto); "hm", "hectometer", "hectometers";
        @decameter: prefix!(deca); "dam", "decameter", "decameters";
        /// The meter is the SI unit of length. It is defined by taking the fixed numerical value
        /// of the speed of light in vacuum *c* to be 299 792 458 when expressed in the unit m s⁻¹,
        /// where the second is defined in terms of the caesium frequency ∆*ν*<sub>Cs</sub>.
        @meter: prefix!(none); "m", "meter", "meters";
        @decimeter: prefix!(deci); "dm", "decimeter", "decimeters";
        @centimeter: prefix!(centi); "cm", "centimeter", "centimeters";
        @millimeter: prefix!(milli); "mm", "millimeter", "millimeters";
        @micrometer: prefix!(micro); "µm", "micrometer", "micrometers";
        @nanometer: prefix!(nano); "nm", "nanometer", "nanometers";
        @picometer: prefix!(pico); "pm", "picometer", "picometers";
        @femtometer: prefix!(femto); "fm", "femtometer", "femtometers";
        @attometer: prefix!(atto); "am", "attometer", "attometers";
        @zeptometer: prefix!(zepto); "zm", "zeptometer", "zeptometers";
        @yoctometer: prefix!(yocto); "ym", "yoctometer", "yoctometers";

        @angstrom: 1.0_E-10; "Å", "ångström", "ångströms";
        @bohr_radius: 5.291_772_109_03_E-11; "a₀", "bohr radius", "bohr radiuses";
        /// Atomic unit of length (Bohr radius).
        @atomic_unit_of_length: 5.291_772_109_03_E-11; "a.u. of length", "atomic unit of length",
            "atomic units of length";
        @astronomical_unit: 1.495_978_707_E11; "ua", "astronomical unit", "astronomical units";
        @chain: 2.011_684_E1; "ch", "chain", "chains";
        @data_mile: 1.828_8_E3; "DM", "data mile", "data miles";
        @fathom: 1.828_804_E0; "fathom", "fathom", "fathoms";
        @fermi: 1.0_E-15; "fermi", "fermi", "fermis";
        @foot: 3.048_E-1; "ft", "foot", "feet";
        @foot_survey: 3.048_006_E-1; "ft (U.S. survey)", "foot (U.S. survey)", "feet (U.S. survey)";
        @inch: 2.54_E-2; "in", "inch", "inches";
        @light_year: 9.460_73_E15; "l. y.", "light year", "light years";
        @microinch: 2.54_E-8; "μin", "microinch", "microinches";
        @micron: 1.0_E-6; "μ", "micron", "microns";
        @mil: 2.54_E-5; "0.001 in", "mil", "mils";
        @mile: 1.609_344_E3; "mi", "mile", "miles";
        @mile_survey: 1.609_347_E3; "mi (U.S. survey)", "mile (U.S. survey)", "miles (U.S. survey)";
        @nautical_mile: 1.852_E3; "M", "nautical mile", "nautical miles";
        @parsec: 3.085_678_E16; "pc", "parsec", "parsecs";
        @pica_computer: 4.233_333_333_333_333_E-3; "1/6 in (computer)", "pica (computer)",
            "picas (computer)";
        @pica_printers: 4.217_518_E-3; "1/6 in", "pica (printer's)", "picas (printer's)";
        @point_computer: 3.527_778_E-4; "1/72 in (computer)", "point (computer)",
            "points (computer)";
        @point_printers: 3.514_598_E-4; "1/72 in", "point (printer's)", "points (printer's)";
        @rod: 5.029_21_E0; "rd", "rod", "rods";
        @yard: 9.144_E-1; "yd", "yard", "yards";

        // Ancient Roman units.
        @leuga: 2.22_E3; "leuga", "leuga", "leugae";
        @mille_passus: 1.48_E3; "mille passus", "mille passus", "mille passa";
        @stadium: 1.85_E2; "stadium", "stadium", "stadia";
        @actus: 3.552_E1; "actus", "actus", "acta";
        @decempeda: 2.96_E0; "decempeda", "decempeda", "decempedae";
        @passus: 1.48_E0; "passus", "passus", "passa";
        @gradus: 7.4_E-1; "gradus", "gradus", "gradus";
        @cubitum: 4.44_E-1; "cubitum", "cubitum", "cubita";
        @palmipes: 3.7_E-1; "palmipes", "palmipes", "palmipedes";
        @pes: 2.96_E-1; "pes", "pes", "pedes";
        @palmus_maior: 2.22_E-1; "palmus maior", "palmus maior", "palmas maior";
        @palmus: 7.4_E-2; "palmus", "palmus", "palmas";
        @uncia: 2.466_666_666_666_666_3_E-2; "uncia", "uncia", "unciae";
        @digitus: 1.85_E-2; "digitus", "digitus", "digiti";
    }
}

#[cfg(test)]
mod tests {
    storage_types! {
        use crate::num::{FromPrimitive, One};
        use crate::si::length as l;
        use crate::si::quantities::*;
        use crate::tests::Test;

        #[test]
        fn check_roman() {
            test::<l::leuga>(7.5_E3);
            test::<l::mille_passus>(5.0_E3);
            test::<l::stadium>(6.25_E2);
            test::<l::actus>(1.2_E2);
            test::<l::decempeda>(1.0_E1);
            test::<l::passus>(5.0_E0);
            test::<l::gradus>(2.5_E0);
            test::<l::cubitum>(1.5_E0);
            test::<l::palmipes>(1.25_E0);
            test::<l::palmus_maior>(3.0_E0 / 4.0_E0);
            test::<l::palmus>(1.0_E0 / 4.0_E0);
            test::<l::uncia>(1.0_E0 / 1.2_E1);
            test::<l::digitus>(1.0_E0 / 1.6_E1);

            fn test<L: l::Conversion<V>>(l: f64) {
                Test::assert_approx_eq(&Length::new::<L>(V::one()),
                    &Length::new::<l::pes>(V::from_f64(l).unwrap()));
            }
        }
    }
}