newnit 0.1.2

A rich newtype library for units of quantity.
Documentation 
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//! Units of volume.
//!
//! This module contains predefined newtypes for units of area as defined in
//! the following systems:
//! - [`customary`] - US Customary units
//! - [`imperial`] - British Imperial units
//! - [`metric`] - International System of Units (SI)

use crate::Unit;
use crate::area::Area;
use crate::area::metric::SquareMeter;
use crate::length::Length;
use crate::length::metric::Meter;

pub mod customary;
pub mod imperial;
pub mod metric;

pub trait Volume: Unit {
    /// Divide a unit of volume by a unit of length
    fn divide_length(&self, rhs: &dyn Length) -> SquareMeter {
        SquareMeter(self.to_base() / rhs.to_base())
    }

    /// Divide a unit of volume by a unit of area
    fn divide_area(&self, rhs: &dyn Area) -> Meter {
        Meter(self.to_base() / rhs.to_base())
    }
}

#[cfg(test)]
mod test {
    use super::*;

    #[test]
    fn divide_by_length() {
        let volume = metric::CubicMeter(6.0);
        let length = crate::length::imperial::Foot(3.0);

        let area = volume.divide_length(&length);
        assert!((area.to_value() - 6.56168).abs() < 1e-5);
    }

    #[test]
    fn divide_by_area() {
        let volume = metric::CubicMeter(4.0);
        let area = crate::area::imperial::SquareInch(6.0);

        let length = volume.divide_area(&area);
        assert!((length.to_value() - 1033.3354).abs() < 1e-5);
    }
}