pub trait SpawnExt: Spawn {
// Provided methods
fn spawn<Fut>(&self, future: Fut) -> Result<(), SpawnError>
where Fut: Future<Output = ()> + Send + 'static { ... }
fn spawn_with_handle<Fut>(
&self,
future: Fut,
) -> Result<RemoteHandle<Fut::Output>, SpawnError>
where Fut: Future + Send + 'static,
Fut::Output: Send { ... }
}
Expand description
Extension trait for Spawn
.
Provided Methods§
sourcefn spawn<Fut>(&self, future: Fut) -> Result<(), SpawnError>
fn spawn<Fut>(&self, future: Fut) -> Result<(), SpawnError>
Spawns a task that polls the given future with output ()
to
completion.
This method returns a Result
that contains a SpawnError
if
spawning fails.
You can use spawn_with_handle
if
you want to spawn a future with output other than ()
or if you want
to be able to await its completion.
Note this method will eventually be replaced with the upcoming
Spawn::spawn
method which will take a dyn Future
as input.
Technical limitations prevent Spawn::spawn
from being implemented
today. Feel free to use this method in the meantime.
use futures::executor::ThreadPool;
use futures::task::SpawnExt;
let executor = ThreadPool::new().unwrap();
let future = async { /* ... */ };
executor.spawn(future).unwrap();
sourcefn spawn_with_handle<Fut>(
&self,
future: Fut,
) -> Result<RemoteHandle<Fut::Output>, SpawnError>
fn spawn_with_handle<Fut>( &self, future: Fut, ) -> Result<RemoteHandle<Fut::Output>, SpawnError>
Spawns a task that polls the given future to completion and returns a future that resolves to the spawned future’s output.
This method returns a Result
that contains a RemoteHandle
, or, if
spawning fails, a SpawnError
. RemoteHandle
is a future that
resolves to the output of the spawned future.
use futures::executor::{block_on, ThreadPool};
use futures::future;
use futures::task::SpawnExt;
let executor = ThreadPool::new().unwrap();
let future = future::ready(1);
let join_handle_fut = executor.spawn_with_handle(future).unwrap();
assert_eq!(block_on(join_handle_fut), 1);