gluesql_utils/
tribool.rs

1#[derive(Debug, Clone, Copy, PartialEq, Eq)]
2pub enum Tribool {
3    True,
4    False,
5    Null,
6}
7
8impl Tribool {
9    pub fn is_true(self) -> bool {
10        matches!(self, Self::True)
11    }
12
13    pub fn is_false(self) -> bool {
14        matches!(self, Self::False)
15    }
16
17    pub fn is_null(self) -> bool {
18        matches!(self, Self::Null)
19    }
20}
21
22impl std::ops::Not for Tribool {
23    type Output = Self;
24
25    fn not(self) -> Self::Output {
26        match self {
27            Self::True => Self::False,
28            Self::False => Self::True,
29            Self::Null => Self::Null,
30        }
31    }
32}
33
34impl From<bool> for Tribool {
35    fn from(v: bool) -> Self {
36        if v { Self::True } else { Self::False }
37    }
38}
39
40#[cfg(test)]
41mod tests {
42    use super::*;
43
44    #[test]
45    fn test_tribool() {
46        let t = Tribool::True;
47        let f = Tribool::False;
48        let n = Tribool::Null;
49
50        assert!(t.is_true());
51        assert!(!t.is_false());
52        assert!(!t.is_null());
53
54        assert!(!f.is_true());
55        assert!(f.is_false());
56        assert!(!f.is_null());
57
58        assert!(!n.is_true());
59        assert!(!n.is_false());
60        assert!(n.is_null());
61    }
62
63    #[test]
64    fn test_conversion_from_bool() {
65        assert_eq!(Tribool::from(true), Tribool::True);
66        assert_eq!(Tribool::from(false), Tribool::False);
67    }
68
69    #[test]
70    fn test_not_operator() {
71        assert_eq!(!Tribool::True, Tribool::False);
72        assert_eq!(!Tribool::False, Tribool::True);
73        assert_eq!(!Tribool::Null, Tribool::Null);
74    }
75}
gluesql_utils/tribool.rs

gluesql_utils/
tribool.rs
