diman 0.2.0

Zero-cost compile-time dimensional analysis.
Documentation 
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use ::diman::dimension;
use ::diman::unit_system;

#[dimension]
pub struct Dimension {
    pub length: i32,
    pub time: i32,
    pub mass: i32,
    pub temperature: i32,
}

unit_system!(
    Quantity,
    Dimension,
    [
        def Dimensionless = {},
        unit dimensionless = Dimensionless,
        def Length = { length: 1 },
        unit (meters, "m") = Length,
        unit (kilometers, "km") = 1000.0 * meters,
        def Time = { time: 1 },
        unit (seconds, "s") = 1.0 * Time,
        def Velocity = Length / Time,
        unit (meters_per_second, "m/s") = meters / seconds,
        def Energy = Mass * Velocity * Velocity,
        unit (joules, "J") = 1.0 * Energy,
        def Mass = { mass: 1 },
        unit (kilograms, "kg") = Mass,
        unit (grams, "g") = 1e-3 * kilograms,
        def Area = Length * Length,
        def Volume = Length * Length * Length,
        def Force = Energy / Length,
        unit (newtons, "N") = joules / meters,
        constant SOLAR_MASS = 1.988477e30 * kilograms,
        constant SOLAR_MASS_GRAMS = 1.988477e33 * grams,
        constant SOLAR_MASS_AWKWARD = 1.988477e30 * kilograms / (seconds / seconds),
    ]
);