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/// A fraction `p`/`q` with integers `p` and `q`. /// /// `p` is called the numerator and `q` is called the denominator. pub trait Fraction<T>: Sized { /// Returns the numerator `p` fn numerator(&self) -> T; /// Returns the denominator `q` fn denominator(&self) -> T; /// Returns the multiplicative inverse `q/p` for fraction `p/q`. /// /// If `p` is zero, None is returned. fn inv(&self) -> Option<Self>; }