horloge 0.1.1

Clock and timer traits
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

use crate::Clock;
use ::std::time::Instant;

/// Standard library clock using the system time.
#[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Hash)]
pub struct SystemStdClock;

impl Clock for SystemStdClock {
  type Instant = Instant;

  fn now(&self) -> Self::Instant {
    Instant::now()
  }
}

// TODO: Rust guarantees monotonicity, for tier 1 platforms. There should be
//       conditional implementation of `Monotonic` when detecting such platform.

#[cfg(test)]
mod tests {
  use super::*;
  use crate::StdClock;
  use ::std::time::Duration;
  const ONE_YEAR: Duration = Duration::new(365 * 24 * 60 * 60, 0);

  #[test]
  fn test_now() {
    let clock = SystemStdClock;
    use_clock(&clock);
    use_std_clock(&clock);
  }

  fn use_clock<TyClock>(clock: &TyClock)
  where
    TyClock: Clock<Instant = Instant>,
  {
    let one_year_ago = Instant::now() - ONE_YEAR;
    let now = clock.now();
    assert!(now > one_year_ago);
    use_std_clock(clock);
  }

  fn use_std_clock<TyClock>(clock: &TyClock)
  where
    TyClock: StdClock,
  {
    let one_year_ago = Instant::now() - ONE_YEAR;
    let now = clock.now_std();
    assert!(now > one_year_ago);
  }
}