[−][src]Struct futures::future::NeverError
#[must_use = "futures do nothing unless polled"]pub struct NeverError<Fut> { /* fields omitted */ }
Future for the never_error combinator.
Trait Implementations
impl<Fut> Unpin for NeverError<Fut> where
Fut: Unpin, [src]
Fut: Unpin,
impl<Fut> FusedFuture for NeverError<Fut> where
Fut: FusedFuture, [src][+]
Fut: FusedFuture,
fn is_terminated(&self) -> bool[src][+]
Returns true if the underlying future should no longer be polled.
impl<Fut> Debug for NeverError<Fut> where
Fut: Debug, [src][+]
Fut: Debug,
fn fmt(&self, f: &mut Formatter) -> Result<(), Error>[src][+]
Formats the value using the given formatter. Read more
impl<Fut, T> Future for NeverError<Fut> where
Fut: Future<Output = T>, [src][+]
Fut: Future<Output = T>,
type Output = Result<T, !>
The type of value produced on completion.
fn poll(self: Pin<&mut NeverError<Fut>>, cx: &mut Context) -> Poll<Result<T, !>>[src][+]
Attempt to resolve the future to a final value, registering the current task for wakeup if the value is not yet available. Read more
Auto Trait Implementations
impl<Fut> Send for NeverError<Fut> where
Fut: Send,
Fut: Send,
impl<Fut> Sync for NeverError<Fut> where
Fut: Sync,
Fut: Sync,
Blanket Implementations
impl<T> From for T[src][+]
impl<T, U> Into for T where
U: From<T>, [src][+]
U: From<T>,
impl<T, U> TryFrom for T where
U: Into<T>, [src][+]
U: Into<T>,
type Error = Infallible
The type returned in the event of a conversion error.
fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>[src][+]
Performs the conversion.
impl<T> Borrow for T where
T: ?Sized, [src][+]
T: ?Sized,
ⓘImportant traits for &'_ mut Ffn borrow(&self) -> &T[src][+]
Immutably borrows from an owned value. Read more
impl<T> Any for T where
T: 'static + ?Sized, [src][+]
T: 'static + ?Sized,
fn type_id(&self) -> TypeId[src][+]
Gets the TypeId of self. Read more
impl<T> BorrowMut for T where
T: ?Sized, [src][+]
T: ?Sized,
ⓘImportant traits for &'_ mut Ffn borrow_mut(&mut self) -> &mut T[src][+]
Mutably borrows from an owned value. Read more
impl<T, U> TryInto for T where
U: TryFrom<T>, [src][+]
U: TryFrom<T>,
type Error = <U as TryFrom<T>>::Error
The type returned in the event of a conversion error.
fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>[src][+]
Performs the conversion.
impl<T> FutureExt for T where
T: Future + ?Sized, [src][+]
T: Future + ?Sized,
ⓘImportant traits for Map<Fut, F>fn map<U, F>(self, f: F) -> Map<Self, F> where
F: FnOnce(Self::Output) -> U, [src][+]
F: FnOnce(Self::Output) -> U,
Map this future's output to a different type, returning a new future of the resulting type. Read more
ⓘImportant traits for Then<Fut1, Fut2, F>fn then<Fut, F>(self, f: F) -> Then<Self, Fut, F> where
F: FnOnce(Self::Output) -> Fut,
Fut: Future, [src][+]
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 more
ⓘImportant traits for Either<A, B>fn left_future<B>(self) -> Either<Self, B> where
B: Future<Output = Self::Output>, [src][+]
B: Future<Output = Self::Output>,
Wrap this future in an Either future, making it the left-hand variant of that Either. Read more
ⓘImportant traits for Either<A, B>fn right_future<A>(self) -> Either<A, Self> where
A: Future<Output = Self::Output>, [src][+]
A: Future<Output = Self::Output>,
Wrap this future in an Either future, making it the right-hand variant of that Either. Read more
fn into_stream(self) -> IntoStream<Self>[src][+]
Convert this future into a single element stream. Read more
ⓘImportant traits for Flatten<Fut>fn flatten(self) -> Flatten<Self> where
Self::Output: Future, [src][+]
Self::Output: Future,
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::Output: Stream, [src][+]
Self::Output: Stream,
Flatten the execution of this future when the successful result of this future is a stream. Read more
ⓘImportant traits for Fuse<Fut>fn fuse(self) -> Fuse<Self>[src][+]
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 more
ⓘImportant traits for Inspect<Fut, F>fn inspect<F>(self, f: F) -> Inspect<Self, F> where
F: FnOnce(&Self::Output), [src][+]
F: FnOnce(&Self::Output),
Do something with the output of a future before passing it on. Read more
ⓘImportant traits for CatchUnwind<Fut>Important traits for CatchUnwind<Fut>
impl<Fut> Future for CatchUnwind<Fut> where
Fut: Future + UnwindSafe, type Output = Result<<Fut as Future>::Output, Box<dyn Any + 'static + Send>>;fn catch_unwind(self) -> CatchUnwind<Self> where
Self: UnwindSafe, [src][+]
Important traits for CatchUnwind<Fut>
impl<Fut> Future for CatchUnwind<Fut> where
Fut: Future + UnwindSafe, type Output = Result<<Fut as Future>::Output, Box<dyn Any + 'static + Send>>;Self: UnwindSafe,
Catches unwinding panics while polling the future. Read more
ⓘImportant traits for Shared<Fut>fn shared(self) -> Shared<Self> where
Self::Output: Clone, [src][+]
Self::Output: Clone,
Create a cloneable handle to this future where all handles will resolve to the same result. Read more
fn remote_handle(self) -> (Remote<Self>, RemoteHandle<Self::Output>)[src][+]
Turn this future into a future that yields () on completion and sends its output to another future on a separate task. Read more
ⓘImportant traits for Pin<P>fn boxed<'a>(self) -> Pin<Box<dyn Future<Output = Self::Output> + 'a + Send>> where
Self: Send + 'a, [src][+]
Self: Send + 'a,
Wrap the future in a Box, pinning it.
ⓘImportant traits for UnitError<Fut>fn unit_error(self) -> UnitError<Self>[src][+]
Turns a Future<Output = T> into a TryFuture<Ok = T, Error = ()>. Read more
ⓘImportant traits for NeverError<Fut>Important traits for NeverError<Fut>
impl<Fut, T> Future for NeverError<Fut> where
Fut: Future<Output = T>, type Output = Result<T, !>;fn never_error(self) -> NeverError<Self>[src][+]
Important traits for NeverError<Fut>
impl<Fut, T> Future for NeverError<Fut> where
Fut: Future<Output = T>, type Output = Result<T, !>;Turns a Future<Output = T> into a TryFuture<Ok = T, Error = !>. Read more
fn poll_unpin(&mut self, cx: &mut Context) -> Poll<Self::Output> where
Self: Unpin, [src][+]
Self: Unpin,
A convenience for calling Future::poll on Unpin future types.
impl<Fut> TryFutureExt for Fut where
Fut: TryFuture + ?Sized, [src][+]
Fut: TryFuture + ?Sized,
fn flatten_sink<Item>(self) -> FlattenSink<Self, Self::Ok> where
Self::Ok: Sink<Item>,
<Self::Ok as Sink<Item>>::SinkError == Self::Error, [src][+]
Self::Ok: Sink<Item>,
<Self::Ok as Sink<Item>>::SinkError == Self::Error,
Flattens the execution of this future when the successful result of this future is a [Sink]. Read more
ⓘImportant traits for MapOk<Fut, F>fn map_ok<T, F>(self, f: F) -> MapOk<Self, F> where
F: FnOnce(Self::Ok) -> T, [src][+]
F: FnOnce(Self::Ok) -> T,
Maps this future's success value to a different value. Read more
ⓘImportant traits for MapErr<Fut, F>fn map_err<E, F>(self, f: F) -> MapErr<Self, F> where
F: FnOnce(Self::Error) -> E, [src][+]
F: FnOnce(Self::Error) -> E,
Maps this future's error value to a different value. Read more
ⓘImportant traits for ErrInto<Fut, E>fn err_into<E>(self) -> ErrInto<Self, E> where
Self::Error: Into<E>, [src][+]
Self::Error: Into<E>,
Maps this future's Error to a new error type using the Into trait. Read more
ⓘImportant traits for AndThen<Fut1, Fut2, F>fn and_then<Fut, F>(self, f: F) -> AndThen<Self, Fut, F> where
F: FnOnce(Self::Ok) -> Fut,
Fut: TryFuture<Error = Self::Error>, [src][+]
F: FnOnce(Self::Ok) -> Fut,
Fut: TryFuture<Error = Self::Error>,
Executes another future after this one resolves successfully. The success value is passed to a closure to create this subsequent future. Read more
ⓘImportant traits for OrElse<Fut1, Fut2, F>fn or_else<Fut, F>(self, f: F) -> OrElse<Self, Fut, F> where
F: FnOnce(Self::Error) -> Fut,
Fut: TryFuture<Ok = Self::Ok>, [src][+]
F: FnOnce(Self::Error) -> Fut,
Fut: TryFuture<Ok = Self::Ok>,
Executes another future if this one resolves to an error. The error value is passed to a closure to create this subsequent future. Read more
ⓘImportant traits for UnwrapOrElse<Fut, F>fn unwrap_or_else<F>(self, f: F) -> UnwrapOrElse<Self, F> where
F: FnOnce(Self::Error) -> Self::Ok, [src][+]
F: FnOnce(Self::Error) -> Self::Ok,
Unwraps this future's ouput, producing a future with this future's Ok type as its Output type. Read more
ⓘImportant traits for Compat<W>fn compat(self) -> Compat<Self> where
Self: Unpin, [src][+]
Self: Unpin,
Wraps a [TryFuture] into a future compatable with libraries using futures 0.1 future definitons. Requires the compat feature to enable. Read more
ⓘImportant traits for IntoFuture<Fut>Important traits for IntoFuture<Fut>
impl<Fut> Future for IntoFuture<Fut> where
Fut: TryFuture, type Output = Result<<Fut as TryFuture>::Ok, <Fut as TryFuture>::Error>;fn into_future(self) -> IntoFuture<Self>[src][+]
Important traits for IntoFuture<Fut>
impl<Fut> Future for IntoFuture<Fut> where
Fut: TryFuture, type Output = Result<<Fut as TryFuture>::Ok, <Fut as TryFuture>::Error>;Wraps a [TryFuture] into a type that implements Future. Read more
impl<F, T, E> TryFuture for F where
F: Future<Output = Result<T, E>> + ?Sized, [src][+]
F: Future<Output = Result<T, E>> + ?Sized,