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
|
//@ check-pass
//@ edition: 2021
// This test case is meant to demonstrate how close we can get to async
// functions in dyn traits with the current level of dyn* support.
#![feature(dyn_star)]
#![allow(incomplete_features)]
use std::future::Future;
trait DynAsyncCounter {
fn increment<'a>(&'a mut self) -> dyn* Future<Output = usize> + 'a;
}
struct MyCounter {
count: usize,
}
impl DynAsyncCounter for MyCounter {
fn increment<'a>(&'a mut self) -> dyn* Future<Output = usize> + 'a {
Box::pin(async {
self.count += 1;
self.count
})
}
}
async fn do_counter(counter: &mut dyn DynAsyncCounter) -> usize {
counter.increment().await
}
fn main() {
let mut counter = MyCounter { count: 0 };
let _ = do_counter(&mut counter);
}
|
