[−][src]Struct futures::future::MapErr

#[must_use = "futures do nothing unless polled"]

pub struct MapErr<Fut, F> { /* fields omitted */ }

Future for the map_err method.

Trait Implementations

impl<Fut, F> Unpin for MapErr<Fut, F> where
    Fut: Unpin, [src]

impl<Fut, F, E> Future for MapErr<Fut, F> where
    F: FnOnce(<Fut as TryFuture>::Error) -> E,
    Fut: TryFuture, [src]

type Output = Result<<Fut as TryFuture>::Ok, E>

🔬 This is a nightly-only experimental API. (futures_api)

futures in libcore are unstable

The type of value produced on completion.

impl<Fut, F> FusedFuture for MapErr<Fut, F>[src]

impl<Fut, F> Debug for MapErr<Fut, F> where
    F: Debug,
    Fut: Debug, [src]

Auto Trait Implementations

impl<Fut, F> Send for MapErr<Fut, F> where
    F: Send,
    Fut: Send, 

impl<Fut, F> Sync for MapErr<Fut, F> where
    F: Sync,
    Fut: Sync, 

Blanket Implementations

impl<T> From for T[src]

impl<T, U> Into for T where
    U: From<T>, [src]

impl<T, U> TryFrom for T where
    U: Into<T>, [src]

type Error = Infallible

The type returned in the event of a conversion error.

impl<T> Borrow for T where
    T: ?Sized, [src]

impl<T> BorrowMut for T where
    T: ?Sized, [src]

impl<T, U> TryInto for T where
    U: TryFrom<T>, [src]

type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.

impl<T> Any for T where
    T: 'static + ?Sized, [src]

impl<T> FutureExt for T where
    T: Future + ?Sized, [src]

ⓘImportant traits for Map<Fut, F>
default fn map<U, F>(self, f: F) -> Map<Self, F> where
    F: FnOnce(Self::Output) -> U, [src]

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>
default fn then<Fut, F>(self, f: F) -> Then<Self, Fut, F> where
    F: FnOnce(Self::Output) -> Fut,
    Fut: Future, [src]

Chain on a computation for when a future finished, passing the result of the future to the provided closure f. Read more

default fn into_stream(self) -> IntoStream<Self>[src]

Convert this future into a single element stream. Read more

ⓘImportant traits for Flatten<Fut>
default fn flatten(self) -> Flatten<Self> where
    Self::Output: Future, [src]

Flatten the execution of this future when the successful result of this future is itself another future. Read more

default fn flatten_stream(self) -> FlattenStream<Self> where
    Self::Output: Stream, [src]

Flatten the execution of this future when the successful result of this future is a stream. Read more

ⓘImportant traits for Fuse<Fut>
default 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>
default fn inspect<F>(self, f: F) -> Inspect<Self, F> where
    F: FnOnce(&Self::Output), [src]

Do something with the output of a future before passing it on. Read more

ⓘImportant traits for CatchUnwind<Fut>
default fn catch_unwind(self) -> CatchUnwind<Self> where
    Self: UnwindSafe, [src]

Catches unwinding panics while polling the future. Read more

ⓘImportant traits for Shared<Fut>
default fn shared(self) -> Shared<Self> where
    Self::Output: Clone, [src]

Create a cloneable handle to this future where all handles will resolve to the same result. Read more

default 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>
default fn boxed(self) -> Pin<Box<Self>>[src]

Wrap the future in a Box, pinning it.

ⓘImportant traits for UnitError<Fut>
default fn unit_error(self) -> UnitError<Self>[src]

Turns a Future into a TryFuture with Error = ().

default fn poll_unpin(&mut self, cx: &mut Context) -> Poll<Self::Output> where
    Self: Unpin, [src]

A convenience for calling Future::poll on Unpin future types.

impl<F, T, E> TryFuture for F where
    F: Future<Output = Result<T, E>>, [src]

type Ok = T

The type of successful values yielded by this future

type Error = E

The type of failures yielded by this future

impl<Fut> TryFutureExt for Fut where
    Fut: TryFuture, [src]

default fn flatten_sink<Item>(self) -> FlattenSink<Self, Self::Ok> where
    Self::Ok: Sink<Item>,
    <Self::Ok as Sink<Item>>::SinkError == Self::Error, [src]

Flattens the execution of this future when the successful result of this future is a [Sink]. Read more

ⓘImportant traits for MapOk<Fut, F>
default fn map_ok<T, F>(self, f: F) -> MapOk<Self, F> where
    F: FnOnce(Self::Ok) -> T, [src]

Maps this future's success value to a different value. Read more

ⓘImportant traits for MapErr<Fut, F>
default fn map_err<E, F>(self, f: F) -> MapErr<Self, F> where
    F: FnOnce(Self::Error) -> E, [src]

Maps this future's error value to a different value. Read more

ⓘImportant traits for ErrInto<Fut, E>
default fn err_into<E>(self) -> ErrInto<Self, E> where
    Self::Error: Into<E>, [src]

Maps this future's Error to a new error type using the Into trait. Read more

ⓘImportant traits for AndThen<Fut1, Fut2, F>
default fn and_then<Fut, F>(self, f: F) -> AndThen<Self, Fut, F> where
    F: FnOnce(Self::Ok) -> Fut,
    Fut: TryFuture<Error = Self::Error>, [src]

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>
default fn or_else<Fut, F>(self, f: F) -> OrElse<Self, Fut, F> where
    F: FnOnce(Self::Error) -> Fut,
    Fut: TryFuture<Ok = Self::Ok>, [src]

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>
default fn unwrap_or_else<F>(self, f: F) -> UnwrapOrElse<Self, F> where
    F: FnOnce(Self::Error) -> Self::Ok, [src]

Unwraps this future's ouput, producing a future with this future's Ok type as its Output type. Read more

ⓘImportant traits for Compat<R>
default fn compat(self) -> Compat<Self> where
    Self: Unpin, [src]

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>
default fn into_future(self) -> IntoFuture<Self>[src]

Wraps a [TryFuture] into a type that implements Future. Read more