rxrust 0.15.0

A Rust implementation of Reactive Extensions.
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

use crate::prelude::*;
use crate::{complete_proxy_impl, error_proxy_impl, is_stopped_proxy_impl};

#[derive(Clone)]
pub struct TakeWhileOp<S, F> {
  pub(crate) source: S,
  pub(crate) callback: F,
}

#[doc(hidden)]
macro_rules! observable_impl {
  ($subscription:ty, $source:ident, $($marker:ident +)* $lf: lifetime) => {
  type Unsub = $source::Unsub;
  fn actual_subscribe<O>(
    self,
    subscriber: Subscriber<O, $subscription>,
  ) -> Self::Unsub
  where O: Observer<Item=Self::Item,Err= Self::Err> + $($marker +)* $lf {
    let subscriber = Subscriber {
      observer: TakeWhileObserver {
        observer: subscriber.observer,
        subscription: subscriber.subscription.clone(),
        callback: self.callback,
      },
      subscription: subscriber.subscription,
    };
    self.source.actual_subscribe(subscriber)
  }
}
}

impl<S, F> Observable for TakeWhileOp<S, F>
where
  S: Observable,
  F: FnMut(&S::Item) -> bool,
{
  type Item = S::Item;
  type Err = S::Err;
}

impl<'a, S, F> LocalObservable<'a> for TakeWhileOp<S, F>
where
  S: LocalObservable<'a>,
  F: FnMut(&S::Item) -> bool + 'a,
{
  observable_impl!(LocalSubscription, S, 'a);
}

impl<S, F> SharedObservable for TakeWhileOp<S, F>
where
  S: SharedObservable,
  F: FnMut(&S::Item) -> bool + Send + Sync + 'static,
{
  observable_impl!(SharedSubscription, S, Send + Sync + 'static);
}

pub struct TakeWhileObserver<O, S, F> {
  observer: O,
  subscription: S,
  callback: F,
}

impl<O, U, Item, Err, F> Observer for TakeWhileObserver<O, U, F>
where
  O: Observer<Item = Item, Err = Err>,
  U: SubscriptionLike,
  F: FnMut(&Item) -> bool,
{
  type Item = Item;
  type Err = Err;
  fn next(&mut self, value: Item) {
    if (self.callback)(&value) {
      self.observer.next(value);
    } else {
      self.observer.complete();
      self.subscription.unsubscribe();
    }
  }
  error_proxy_impl!(Err, observer);
  complete_proxy_impl!(observer);
  is_stopped_proxy_impl!(observer);
}

#[cfg(test)]
mod test {
  use crate::prelude::*;

  #[test]
  fn base_function() {
    let mut completed = false;
    let mut next_count = 0;

    observable::from_iter(0..100)
      .take_while(|v| v < &5)
      .subscribe_complete(|_| next_count += 1, || completed = true);

    assert_eq!(next_count, 5);
    assert!(completed);
  }

  #[test]
  fn take_while_support_fork() {
    let mut nc1 = 0;
    let mut nc2 = 0;
    {
      let take_while5 = observable::from_iter(0..100).take_while(|v| v < &5);
      let f1 = take_while5.clone();
      let f2 = take_while5;

      f1.take_while(|v| v < &5).subscribe(|_| nc1 += 1);
      f2.take_while(|v| v < &5).subscribe(|_| nc2 += 1);
    }
    assert_eq!(nc1, 5);
    assert_eq!(nc2, 5);
  }

  #[test]
  fn ininto_shared() {
    observable::from_iter(0..100)
      .take_while(|v| v < &5)
      .take_while(|v| v < &5)
      .into_shared()
      .subscribe(|_| {});
  }

  #[test]
  fn bench() { do_bench(); }

  benchmark_group!(do_bench, bench_take_while);

  fn bench_take_while(b: &mut bencher::Bencher) { b.iter(base_function); }
}