fn_traits/fns/
poll_ready_fn.rs

1use crate::{Fn, FnMut, FnOnce};
2use core::marker::PhantomData;
3use core::task::Poll;
4
5/// [`Poll::Ready`] function.
6#[derive(Clone, Copy, Default)]
7pub struct PollReadyFn {
8    _phantom: PhantomData<()>,
9}
10
11impl<T> FnOnce<(T,)> for PollReadyFn {
12    type Output = Poll<T>;
13
14    fn call_once(self, args: (T,)) -> Self::Output {
15        Poll::Ready(args.0)
16    }
17}
18
19impl<T> FnMut<(T,)> for PollReadyFn {
20    type Output = Poll<T>;
21
22    fn call_mut(&mut self, args: (T,)) -> Self::Output {
23        self.call_once(args)
24    }
25}
26
27impl<T> Fn<(T,)> for PollReadyFn {
28    type Output = Poll<T>;
29
30    fn call(&self, args: (T,)) -> Self::Output {
31        self.call_once(args)
32    }
33}
34
35#[cfg(test)]
36mod tests {
37    use super::super::tests::{into_std_fn, into_std_fn_mut, into_std_fn_once};
38    use super::PollReadyFn;
39    use core::task::Poll;
40
41    #[test]
42    fn test_poll_ready_fn() {
43        let f = PollReadyFn::default();
44
45        assert_eq!(into_std_fn_once(Clone::clone(&f))(2), Poll::Ready(2));
46        assert_eq!(into_std_fn_mut(Clone::clone(&f))(2), Poll::Ready(2));
47        assert_eq!(into_std_fn(Clone::clone(&f))(2), Poll::Ready(2));
48    }
49}
fn_traits/fns/poll_ready_fn.rs

fn_traits/fns/
poll_ready_fn.rs
