#[non_exhaustive]pub struct Never;Expand description
Future that never completes.
Implementations
Trait Implementations
Auto Trait Implementations
impl RefUnwindSafe for Never
impl Send for Never
impl Sync for Never
impl Unpin for Never
impl UnwindSafe for Never
Blanket Implementations
sourceimpl<T> BorrowMut<T> for Twhere
T: ?Sized,
impl<T> BorrowMut<T> for Twhere
T: ?Sized,
const: unstable · sourcefn borrow_mut(&mut self) -> &mut T
fn borrow_mut(&mut self) -> &mut T
Mutably borrows from an owned value. Read more
sourceimpl<T> FutureExt for Twhere
T: Future + ?Sized,
impl<T> FutureExt for Twhere
T: Future + ?Sized,
sourcefn map<U, F>(self, f: F) -> Map<Self, F>where
F: FnOnce(Self::Output) -> U,
fn map<U, F>(self, f: F) -> Map<Self, F>where
F: FnOnce(Self::Output) -> U,
Map this future’s output to a different type, returning a new future of
the resulting type. Read more
sourcefn map_into<U>(self) -> MapInto<Self, U>where
Self::Output: Into<U>,
fn map_into<U>(self) -> MapInto<Self, U>where
Self::Output: Into<U>,
Map this future’s output to a different type, returning a new future of
the resulting type. Read more
sourcefn then<Fut, F>(self, f: F) -> Then<Self, Fut, F>where
F: FnOnce(Self::Output) -> Fut,
Fut: Future,
fn then<Fut, F>(self, f: F) -> Then<Self, Fut, F>where
F: FnOnce(Self::Output) -> Fut,
Fut: Future,
Chain on a computation for when a future finished, passing the result of
the future to the provided closure
f. Read moresourcefn left_future<B>(self) -> Either<Self, B>where
B: Future<Output = Self::Output>,
fn left_future<B>(self) -> Either<Self, B>where
B: Future<Output = Self::Output>,
sourcefn right_future<A>(self) -> Either<A, Self>where
A: Future<Output = Self::Output>,
fn right_future<A>(self) -> Either<A, Self>where
A: Future<Output = Self::Output>,
sourcefn into_stream(self) -> IntoStream<Self>
fn into_stream(self) -> IntoStream<Self>
Convert this future into a single element stream. Read more
sourcefn flatten(self) -> Flatten<Self>where
Self::Output: Future,
fn flatten(self) -> Flatten<Self>where
Self::Output: Future,
Flatten the execution of this future when the output of this
future is itself another future. Read more
sourcefn flatten_stream(self) -> FlattenStream<Self>where
Self::Output: Stream,
fn flatten_stream(self) -> FlattenStream<Self>where
Self::Output: Stream,
Flatten the execution of this future when the successful result of this
future is a stream. Read more
sourcefn fuse(self) -> Fuse<Self>
fn fuse(self) -> Fuse<Self>
Fuse a future such that
poll will never again be called once it has
completed. This method can be used to turn any Future into a
FusedFuture. Read moresourcefn inspect<F>(self, f: F) -> Inspect<Self, F>where
F: FnOnce(&Self::Output),
fn inspect<F>(self, f: F) -> Inspect<Self, F>where
F: FnOnce(&Self::Output),
Do something with the output of a future before passing it on. Read more
sourcefn catch_unwind(self) -> CatchUnwind<Self>where
Self: UnwindSafe,
fn catch_unwind(self) -> CatchUnwind<Self>where
Self: 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
sourcefn boxed<'a>(
self
) -> Pin<Box<dyn Future<Output = Self::Output> + Send + 'a, Global>>where
Self: 'a + Send,
fn boxed<'a>(
self
) -> Pin<Box<dyn Future<Output = Self::Output> + Send + 'a, Global>>where
Self: 'a + Send,
Wrap the future in a Box, pinning it. Read more
sourcefn boxed_local<'a>(
self
) -> Pin<Box<dyn Future<Output = Self::Output> + 'a, Global>>where
Self: 'a,
fn boxed_local<'a>(
self
) -> Pin<Box<dyn Future<Output = Self::Output> + 'a, Global>>where
Self: 'a,
Wrap the future in a Box, pinning it. Read more
sourcefn unit_error(self) -> UnitError<Self>
fn unit_error(self) -> UnitError<Self>
sourcefn never_error(self) -> NeverError<Self>
fn never_error(self) -> NeverError<Self>
sourcefn poll_unpin(&mut self, cx: &mut Context<'_>) -> Poll<Self::Output>where
Self: Unpin,
fn poll_unpin(&mut self, cx: &mut Context<'_>) -> Poll<Self::Output>where
Self: Unpin,
A convenience for calling
Future::poll on Unpin future types.sourcefn now_or_never(self) -> Option<Self::Output>
fn now_or_never(self) -> Option<Self::Output>
Evaluates and consumes the future, returning the resulting output if
the future is ready after the first call to
Future::poll. Read moresourceimpl<F> IntoFuture for Fwhere
F: Future,
impl<F> IntoFuture for Fwhere
F: Future,
type IntoFuture = F
type IntoFuture = F
Which kind of future are we turning this into?
sourcefn into_future(self) -> <F as IntoFuture>::IntoFuture
fn into_future(self) -> <F as IntoFuture>::IntoFuture
Creates a future from a value. Read more