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