friendly 0.2.0

Human-friendly display library
Documentation 
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use super::{Prefix, PrefixFamily, Scale};

/// A binary scale.
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub struct Binary {
    pfx: &'static str,
    exp: i32,
}

impl Binary {
    const fn new(pfx: &'static str, exp: i32) -> Binary {
        Binary { pfx, exp }
    }

    pub const UNIT: Binary = Binary::new("", 0);
    pub const KIBI: Binary = Binary::new("Ki", 10);
    pub const MEBI: Binary = Binary::new("Mi", 20);
    pub const GIBI: Binary = Binary::new("Gi", 30);
    pub const TEBI: Binary = Binary::new("Ti", 40);
    pub const PEBI: Binary = Binary::new("Pi", 50);
    pub const EXBI: Binary = Binary::new("Ei", 60);
    pub const ZEBI: Binary = Binary::new("Zi", 70);
    pub const YOBI: Binary = Binary::new("Yi", 80);

    pub const AUTO: Scale<Binary> = Scale::Auto;

    pub const ALL_PREFIXES: &'static [&'static Binary] = &[
        &Binary::UNIT,
        &Binary::KIBI,
        &Binary::MEBI,
        &Binary::GIBI,
        &Binary::TEBI,
        &Binary::PEBI,
        &Binary::EXBI,
        &Binary::ZEBI,
        &Binary::YOBI,
    ];
}

impl Prefix for Binary {
    #[inline]
    fn base(&self) -> i32 {
        2
    }

    #[inline]
    fn exponent(&self) -> i32 {
        self.exp
    }

    fn multiplier(&self) -> f64 {
        let mult = 1u128 << self.exp;
        mult as f64
    }

    fn label(&self) -> &'static str {
        self.pfx
    }
}

impl PrefixFamily for Binary {
    type Prefix = Binary;

    fn unit_prefix() -> Binary {
        Binary::UNIT
    }

    fn all_prefixes() -> &'static [&'static Binary] {
        Binary::ALL_PREFIXES
    }
}

#[test]
fn test_multipliers() {
    assert_eq!(Binary::UNIT.multiplier(), 1.0);
    assert_eq!(Binary::KIBI.multiplier(), 1024.0);
    assert_eq!(Binary::MEBI.multiplier(), 1024.0 * 1024.0);
    assert_eq!(Binary::GIBI.multiplier(), 1024.0 * 1024.0 * 1024.0);
}