tinytime 0.15.0

Low overhead implementation of time-related concepts.
Documentation 
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
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135

use rand::RngExt;
use rand::distr::Distribution;
use rand::distr::StandardUniform;
use rand::distr::uniform::SampleBorrow;
use rand::distr::uniform::SampleUniform;
use rand::distr::uniform::UniformInt;
use rand::distr::uniform::UniformSampler;

use crate::Duration;
use crate::Time;

impl Distribution<Time> for StandardUniform {
    fn sample<R: RngExt + ?Sized>(&self, rng: &mut R) -> Time {
        Time(rng.random())
    }
}

#[derive(Debug, Clone, Copy)]
pub struct UniformTime(UniformInt<i64>);

impl UniformSampler for UniformTime {
    type X = Time;

    fn new<B1, B2>(low: B1, high: B2) -> Result<Self, rand::distr::uniform::Error>
    where
        B1: SampleBorrow<Self::X> + Sized,
        B2: SampleBorrow<Self::X> + Sized,
    {
        UniformInt::new(low.borrow().0, high.borrow().0).map(Self)
    }

    fn new_inclusive<B1, B2>(low: B1, high: B2) -> Result<Self, rand::distr::uniform::Error>
    where
        B1: SampleBorrow<Self::X> + Sized,
        B2: SampleBorrow<Self::X> + Sized,
    {
        UniformInt::new_inclusive(low.borrow().0, high.borrow().0).map(Self)
    }

    fn sample<R: RngExt + ?Sized>(&self, rng: &mut R) -> Self::X {
        Time(self.0.sample(rng))
    }
}

impl SampleUniform for Time {
    type Sampler = UniformTime;
}

impl Distribution<Duration> for StandardUniform {
    fn sample<R: RngExt + ?Sized>(&self, rng: &mut R) -> Duration {
        Duration(rng.random())
    }
}

#[derive(Debug, Clone, Copy)]
pub struct UniformDuration(UniformInt<i64>);

impl UniformSampler for UniformDuration {
    type X = Duration;

    fn new<B1, B2>(low: B1, high: B2) -> Result<Self, rand::distr::uniform::Error>
    where
        B1: SampleBorrow<Self::X> + Sized,
        B2: SampleBorrow<Self::X> + Sized,
    {
        UniformInt::new(low.borrow().0, high.borrow().0).map(Self)
    }

    fn new_inclusive<B1, B2>(low: B1, high: B2) -> Result<Self, rand::distr::uniform::Error>
    where
        B1: SampleBorrow<Self::X> + Sized,
        B2: SampleBorrow<Self::X> + Sized,
    {
        UniformInt::new_inclusive(low.borrow().0, high.borrow().0).map(Self)
    }

    fn sample<R: RngExt + ?Sized>(&self, rng: &mut R) -> Self::X {
        Duration(self.0.sample(rng))
    }
}

impl SampleUniform for Duration {
    type Sampler = UniformDuration;
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn standard_time() {
        let _: Time = rand::random();
        let _: Time = rand::rng().random();
    }

    #[test]
    fn uniform_time() {
        let mut rng = rand::rng();
        assert_eq!(Time::EPOCH, rng.random_range(Time::EPOCH..Time::millis(1)));
        assert_eq!(Time::EPOCH, rng.random_range(Time::EPOCH..=Time::EPOCH));

        let low = Time::millis(100);
        let high = Time::millis(110);
        for _ in 0..1000 {
            let x = rng.random_range(low..high);
            assert!((low..high).contains(&x));
        }
    }

    #[test]
    fn standard_duration() {
        let _: Duration = rand::random();
        let _: Duration = rand::rng().random();
    }

    #[test]
    fn uniform_duration() {
        let mut rng = rand::rng();
        assert_eq!(
            Duration::ZERO,
            rng.random_range(Duration::ZERO..Duration::millis(1))
        );
        assert_eq!(
            Duration::ZERO,
            rng.random_range(Duration::ZERO..=Duration::ZERO)
        );

        let low = Duration::millis(100);
        let high = Duration::millis(110);
        for _ in 0..1000 {
            let x = rng.random_range(low..high);
            assert!((low..high).contains(&x));
        }
    }
}