async-iter-ext 0.1.0

Async iterator methods and async methods for option and result.
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

pub trait AsyncOptionTools<T> {
  #[allow(clippy::wrong_self_convention)]
  fn is_some_and_async<F, Fut>(self, f: F) -> impl Future<Output = bool>
  where
    F: FnOnce(T) -> Fut,
    Fut: Future<Output = bool>;

  #[allow(clippy::wrong_self_convention)]
  fn is_none_or_async<F, Fut>(self, f: F) -> impl Future<Output = bool>
  where
    F: FnOnce(T) -> Fut,
    Fut: Future<Output = bool>;

  fn map_async<B, F, Fut>(self, f: F) -> impl Future<Output = Option<B>>
  where
    F: FnOnce(T) -> Fut,
    Fut: Future<Output = B>;
}

impl<T> AsyncOptionTools<T> for Option<T> {
  async fn is_some_and_async<F, Fut>(self, f: F) -> bool
  where
    F: FnOnce(T) -> Fut,
    Fut: Future<Output = bool>,
  {
    if let Some(x) = self { f(x).await } else { false }
  }

  async fn is_none_or_async<F, Fut>(self, f: F) -> bool
  where
    F: FnOnce(T) -> Fut,
    Fut: Future<Output = bool>,
  {
    if let Some(x) = self { f(x).await } else { true }
  }

  async fn map_async<B, F, Fut>(self, f: F) -> Option<B>
  where
    F: FnOnce(T) -> Fut,
    Fut: Future<Output = B>,
  {
    if let Some(x) = self { Some(f(x).await) } else { None }
  }
}