mathf/
math_helper.rs

1/// Function to determine possible equality problems between 2 equal floats.
2/// `delta` is the equality variance.
3/// ```
4/// use mathf::math_helper::float_eq;
5/// assert!(float_eq(4.00001, 4.00002, 0.0001));
6/// assert!(!float_eq(4.00001, 4.00002, 0.00001));
7/// ```
8pub fn float_eq(a: f32, b: f32, delta: f32) -> bool {
9    a == b || (a.abs() - b.abs()).abs().le(&delta)
10}
11
12#[cfg(test)]
13mod test {
14    use super::float_eq;
15
16    #[test]
17    fn non_equal_floats() {
18        assert!(!float_eq(5f32, 2f32, 1f32));
19    }
20
21    #[test]
22    fn equal_floats_small_delta() {
23        assert!(float_eq(3.0005f32, 3.0005f32, 0.00000001f32));
24    }
25}
mathf/math_helper.rs

mathf/
math_helper.rs
