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
use std::marker;
use {Future, Task, Poll};
pub struct Finished<T, E> {
t: Option<T>,
_e: marker::PhantomData<E>,
}
pub fn finished<T, E>(t: T) -> Finished<T, E>
where T: Send + 'static,
E: Send + 'static,
{
Finished { t: Some(t), _e: marker::PhantomData }
}
impl<T, E> Future for Finished<T, E>
where T: Send + 'static,
E: Send + 'static,
{
type Item = T;
type Error = E;
fn poll(&mut self, _: &mut Task) -> Poll<T, E> {
Poll::Ok(self.t.take().expect("cannot poll Finished twice"))
}
fn schedule(&mut self, task: &mut Task) {
task.notify();
}
}