ginger/
vector2_ref.rs

1#![allow(dead_code)]
2
3struct Vector2Ref<'a> {
4    x: &'a mut f64,
5    y: &'a mut f64,
6}
7
8impl<'a> Vector2Ref<'a> {
9    fn new(x: &'a mut f64, y: &'a mut f64) -> Self {
10        Vector2Ref { x, y }
11    }
12
13    fn dot(&self, other: &Vector2Ref) -> f64 {
14        *self.x * *other.x + *self.y * *other.y
15    }
16
17    fn cross(&self, other: &Vector2Ref) -> f64 {
18        *self.x * *other.y - *other.x * *self.y
19    }
20
21    fn add_assign(&mut self, other: &Vector2Ref) {
22        *self.x += *other.x;
23        *self.y += *other.y;
24    }
25
26    fn sub_assign(&mut self, other: &Vector2Ref) {
27        *self.x -= *other.x;
28        *self.y -= *other.y;
29    }
30
31    fn mul_assign(&mut self, alpha: f64) {
32        *self.x *= alpha;
33        *self.y *= alpha;
34    }
35
36    fn div_assign(&mut self, alpha: f64) {
37        *self.x /= alpha;
38        *self.y /= alpha;
39    }
40}
41
42#[cfg(test)]
43mod tests {
44    use super::*;
45
46    #[test]
47    fn test_vector2() {
48        let mut x = 1.0;
49        let mut y = 2.0;
50
51        let mut v = Vector2Ref::new(&mut x, &mut y);
52        v.mul_assign(2.0);
53        assert_eq!(*v.x, 2.0);
54        assert_eq!(*v.y, 4.0);
55
56        let mut v2 = Vector2Ref::new(&mut x, &mut y);
57        v2.mul_assign(2.0);
58        assert_eq!(*v2.y, 8.0);
59    }
60}
ginger/vector2_ref.rs

ginger/
vector2_ref.rs
