Expand description
Enstream provides a way to convert Future
to Stream
.
§Example
#![feature(type_alias_impl_trait)]
use std::future::Future;
use enstream::{HandlerFn, HandlerFnLifetime, Yielder, enstream};
use futures_util::{future::FutureExt, pin_mut, stream::StreamExt};
struct StreamState<'a> {
val: &'a str
}
// A separate type alias is used to work around TAIT bugs
type Fut<'yielder, 'a: 'yielder> = impl Future<Output = ()>;
impl<'yielder, 'a> HandlerFnLifetime<'yielder, &'a str> for StreamState<'a> {
type Fut = Fut<'yielder, 'a>;
}
impl<'a> HandlerFn<&'a str> for StreamState<'a> {
fn call<'yielder>(
self,
mut yielder: Yielder<'yielder, &'a str>,
) -> <Self as HandlerFnLifetime<'yielder, &'a str>>::Fut {
async move {
yielder.yield_item(self.val).await;
}
}
}
let owned = String::from("test");
let stream = enstream(StreamState {
val: &owned
});
pin_mut!(stream);
assert_eq!(stream.next().now_or_never().flatten(), Some("test"));
Structs§
Traits§
- Handler
Fn Future
generator that can be converted toStream
.- Handler
FnLifetime - Associated types of a
HandlerFn
with the specific lifetime of the yielder applied.