Struct futures::future::Fuse
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#[must_use = "futures do nothing unless polled"]pub struct Fuse<A: Future> { /* fields omitted */ }
A future which "fuses" a future once it's been resolved.
Normally futures can behave unpredictable once they're used after a future
has been resolved, but Fuse
is always defined to return Async::NotReady
from poll
after it has resolved successfully or returned an error.
This is created by the Future::fuse
method.
Trait Implementations
impl<A: Debug + Future> Debug for Fuse<A>
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impl<A: Future> Future for Fuse<A>
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type Item = A::Item
The type of value that this future will resolved with if it is successful. Read more
type Error = A::Error
The type of error that this future will resolve with if it fails in a normal fashion. Read more
fn poll(&mut self) -> Poll<A::Item, A::Error>
Query this future to see if its value has become available, registering interest if it is not. Read more
fn wait(self) -> Result<Self::Item, Self::Error> where Self: Sized
Block the current thread until this future is resolved. Read more
fn boxed(self) -> BoxFuture<Self::Item, Self::Error> where Self: Sized + Send + 'static
Convenience function for turning this future into a trait object which is also Send
. Read more
fn map<F, U>(self, f: F) -> Map<Self, F> where F: FnOnce(Self::Item) -> U, Self: Sized
Map this future's result to a different type, returning a new future of the resulting type. Read more
fn map_err<F, E>(self, f: F) -> MapErr<Self, F> where F: FnOnce(Self::Error) -> E, Self: Sized
Map this future's error to a different error, returning a new future. Read more
fn from_err<E: From<Self::Error>>(self) -> FromErr<Self, E> where Self: Sized
Map this future's error to any error implementing From
for this future's Error
, returning a new future. Read more
fn then<F, B>(self, f: F) -> Then<Self, B, F> where F: FnOnce(Result<Self::Item, Self::Error>) -> B,
B: IntoFuture,
Self: Sized
B: IntoFuture,
Self: Sized
Chain on a computation for when a future finished, passing the result of the future to the provided closure f
. Read more
fn and_then<F, B>(self, f: F) -> AndThen<Self, B, F> where F: FnOnce(Self::Item) -> B,
B: IntoFuture<Error=Self::Error>,
Self: Sized
B: IntoFuture<Error=Self::Error>,
Self: Sized
Execute another future after this one has resolved successfully. Read more
fn or_else<F, B>(self, f: F) -> OrElse<Self, B, F> where F: FnOnce(Self::Error) -> B,
B: IntoFuture<Item=Self::Item>,
Self: Sized
B: IntoFuture<Item=Self::Item>,
Self: Sized
Execute another future if this one resolves with an error. Read more
fn select<B>(self, other: B) -> Select<Self, B::Future> where B: IntoFuture<Item=Self::Item, Error=Self::Error>, Self: Sized
Waits for either one of two futures to complete. Read more
fn select2<B>(self, other: B) -> Select2<Self, B::Future> where B: IntoFuture, Self: Sized
Waits for either one of two differently-typed futures to complete. Read more
fn join<B>(self, other: B) -> Join<Self, B::Future> where B: IntoFuture<Error=Self::Error>, Self: Sized
Joins the result of two futures, waiting for them both to complete. Read more
fn join3<B, C>(self, b: B, c: C) -> Join3<Self, B::Future, C::Future> where B: IntoFuture<Error=Self::Error>,
C: IntoFuture<Error=Self::Error>,
Self: Sized
C: IntoFuture<Error=Self::Error>,
Self: Sized
Same as join
, but with more futures.
fn join4<B, C, D>(self,
b: B,
c: C,
d: D)
-> Join4<Self, B::Future, C::Future, D::Future> where B: IntoFuture<Error=Self::Error>,
C: IntoFuture<Error=Self::Error>,
D: IntoFuture<Error=Self::Error>,
Self: Sized
b: B,
c: C,
d: D)
-> Join4<Self, B::Future, C::Future, D::Future> where B: IntoFuture<Error=Self::Error>,
C: IntoFuture<Error=Self::Error>,
D: IntoFuture<Error=Self::Error>,
Self: Sized
Same as join
, but with more futures.
fn join5<B, C, D, E>(self,
b: B,
c: C,
d: D,
e: E)
-> Join5<Self, B::Future, C::Future, D::Future, E::Future> where B: IntoFuture<Error=Self::Error>,
C: IntoFuture<Error=Self::Error>,
D: IntoFuture<Error=Self::Error>,
E: IntoFuture<Error=Self::Error>,
Self: Sized
b: B,
c: C,
d: D,
e: E)
-> Join5<Self, B::Future, C::Future, D::Future, E::Future> where B: IntoFuture<Error=Self::Error>,
C: IntoFuture<Error=Self::Error>,
D: IntoFuture<Error=Self::Error>,
E: IntoFuture<Error=Self::Error>,
Self: Sized
Same as join
, but with more futures.
fn into_stream(self) -> IntoStream<Self> where Self: Sized
Convert this future into a single element stream. Read more
fn flatten(self) -> Flatten<Self> where Self::Item: IntoFuture,
Self::Item::Error: From<Self::Error>,
Self: Sized
Self::Item::Error: From<Self::Error>,
Self: Sized
Flatten the execution of this future when the successful result of this future is itself another future. Read more
fn flatten_stream(self) -> FlattenStream<Self> where Self::Item: Stream<Error=Self::Error>, Self: Sized
Flatten the execution of this future when the successful result of this future is a stream. Read more
fn fuse(self) -> Fuse<Self> where Self: Sized
Fuse a future such that poll
will never again be called once it has completed. Read more
fn catch_unwind(self) -> CatchUnwind<Self> where Self: Sized + UnwindSafe
Catches unwinding panics while polling the future. Read more
Create a cloneable handle to this future where all handles will resolve to the same result. Read more