1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53

use std::cmp::{Ordering, PartialOrd};


pub fn partial_min<T>(a: T, b: T) -> T
where
    T: PartialOrd,
{
    match a < b {
        true => a,
        false => b,
    }
}

pub fn partial_max<T>(a: T, b: T) -> T
where
    T: PartialOrd,
{
    match a > b {
        true => a,
        false => b,
    }
}


// sorts floating point integers, placing nan values at the end
pub fn compare_floating<T>(a: &T, b: &T) -> Ordering
where
    T: Float + Copy + PartialOrd,
{
    match (a, b) {
        (x, y) if x.is_nan() && y.is_nan() => Ordering::Equal,
        (x, _) if x.is_nan() => Ordering::Greater,
        (_, y) if y.is_nan() => Ordering::Less,
        (_, _) => a.partial_cmp(b).unwrap(),
    }
}


pub trait Float {
    fn is_nan(self) -> bool;
}

impl Float for f32 {
    fn is_nan(self) -> bool {
        self.is_nan()
    }
}

impl Float for f64 {
    fn is_nan(self) -> bool {
        self.is_nan()
    }
}