example.rs

#[derive(Copy, Clone, Debug)]
pub struct Vector2<T> {
    pub x: T,
    pub y: T,
}

impl<T: Copy + Num + Signed> Vector2<T> {

    pub fn new(x: T, y: T) -> Vector2<T> where T: Float {
        assert!(!x.is_nan() && !y.is_nan());
        Vector2{x: x, y: y}
    }

    pub fn length(&self) -> f32 where T: NumCast + Add<T, Output = T> + Mul<T, Output = T> {
		self.length_squared().sqrt()
    }

    pub fn length_squared(&self) -> f32 where T: NumCast + Add<T, Output = T> + Mul<T, Output = T> {
        num::cast(self.x * self.x + self.y * self.y).unwrap()
    }

    pub fn abs(&self) -> Vector2<T> {
        Vector2{x: self.x.abs(), y: self.y.abs()}
    }

    pub fn dot(&self, v2: Vector2<T>) -> T where T: Add<T, Output = T> + Mul<T, Output = T> {
        self.x * v2.x + self.y * v2.y
    }

    pub fn abs_dot(&self, v2: Vector2<T>) -> T {
       //self.dot(v2).abs() 
		num::abs(self.dot(v2))
    }
}