typerat 0.0.4

Type-level rational numbers based on `typenum`.
Documentation 
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use crate::{Denominator, Numerator, Q};
use core::ops::{Add, Neg, Sub};

impl<Nl, Dl, Nr, Dr, No, Do> Sub<Q<Nr, Dr>> for Q<Nl, Dl>
where
    Self: Add<<Q<Nr, Dr> as Neg>::Output, Output = Q<No, Do>>,
    Q<Nr, Dr>: Neg,
    Nl: Numerator<Dl>,
    Dl: Denominator,
    Nr: Numerator<Dr>,
    Dr: Denominator,
    No: Numerator<Do>,
    Do: Denominator,
{
    type Output = Q<No, Do>;

    fn sub(self, rhs: Q<Nr, Dr>) -> Self::Output {
        let _ = rhs;
        Self::Output::new()
    }
}

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

    #[test]
    fn test_sub() {
        // positive - zero
        assert!(Q::<P1, P2>::new() - Q::<Z0>::new() == Q::<P1, P2>::new());

        // positive - positive
        assert!(Q::<P1, P2>::new() - Q::<P1, P3>::new() == Q::<P1, P6>::new());
    }
}