Or if this type is used a lot, you can wrap the 16-bit integer inside its own type and overload addition and/or other operators.

    struct Angle(i16);
    impl Add for Angle {
        type Output = Angle;
        fn add(self, rhs: Angle) -> Angle {
            Angle(self.0.wrapping_add(rhs.0))
        }
    }