Interface HasMultiply

Source Code/19-27.rs:21–23

        fn exp(self) -> Self { self.exp() }
    }
    trait HasMultiply<Rhs> {
        fn multiply(self, rhs: Rhs) -> Self;
    }
    impl<Rhs> HasMultiply<Rhs> for f64 where Rhs: Into<Self> {
        fn multiply(self, rhs: Rhs) -> Self { self * rhs.into() }
    }