Struct tokio::prelude::future::OrElse

[+] Show declaration

[+] Expand attributes
#[must_use = "futures do nothing unless polled"]
pub struct OrElse<A, B, F> where
    A: Future,
    B: IntoFuture,  { /* fields omitted */ }

[−] Expand description

Future for the or_else combinator, chaining a computation onto the end of a future which fails with an error.

This is created by the Future::or_else method.

Trait Implementations

impl<A, B, F> Future for OrElse<A, B, F> where     A: Future,     B: IntoFuture<Item = <A as Future>::Item>,     F: FnOnce(<A as Future>::Error) -> B,

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type Item = <B as IntoFuture>::Item

The type of value that this future will resolved with if it is successful.

type Error = <B as IntoFuture>::Error

The type of error that this future will resolve with if it fails in a normal fashion.

fn poll(     &mut self ) -> Result<Async<<B as IntoFuture>::Item>, <B as IntoFuture>::Error>

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Query this future to see if its value has become available, registering interest if it is not.

fn wait(self) -> Result<Self::Item, Self::Error>

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Block the current thread until this future is resolved.

fn map<F, U>(self, f: F) -> Map<Self, F> where     F: FnOnce(Self::Item) -> U,

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Map this future's result to a different type, returning a new future of the resulting type.

fn map_err<F, E>(self, f: F) -> MapErr<Self, F> where     F: FnOnce(Self::Error) -> E,

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Map this future's error to a different error, returning a new future.

fn from_err<E>(self) -> FromErr<Self, E> where     E: From<Self::Error>,

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Map this future's error to any error implementing From for this future's Error, returning a new future.

fn then<F, B>(self, f: F) -> Then<Self, B, F> where     B: IntoFuture,     F: FnOnce(Result<Self::Item, Self::Error>) -> B,

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

fn and_then<F, B>(self, f: F) -> AndThen<Self, B, F> where     B: IntoFuture<Error = Self::Error>,     F: FnOnce(Self::Item) -> B,

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Execute another future after this one has resolved successfully.

fn or_else<F, B>(self, f: F) -> OrElse<Self, B, F> where     B: IntoFuture<Item = Self::Item>,     F: FnOnce(Self::Error) -> B,

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Execute another future if this one resolves with an error.

fn select<B>(self, other: B) -> Select<Self, <B as IntoFuture>::Future> where     B: IntoFuture<Item = Self::Item, Error = Self::Error>,

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Waits for either one of two futures to complete.

fn select2<B>(self, other: B) -> Select2<Self, <B as IntoFuture>::Future> where     B: IntoFuture,

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Waits for either one of two differently-typed futures to complete.

fn join<B>(self, other: B) -> Join<Self, <B as IntoFuture>::Future> where     B: IntoFuture<Error = Self::Error>,

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Joins the result of two futures, waiting for them both to complete.

fn join3<B, C>(     self,     b: B,     c: C ) -> Join3<Self, <B as IntoFuture>::Future, <C as IntoFuture>::Future> where     B: IntoFuture<Error = Self::Error>,     C: IntoFuture<Error = Self::Error>,

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Same as join, but with more futures.

fn join4<B, C, D>(     self,     b: B,     c: C,     d: D ) -> Join4<Self, <B as IntoFuture>::Future, <C as IntoFuture>::Future, <D as IntoFuture>::Future> where     B: IntoFuture<Error = Self::Error>,     C: IntoFuture<Error = Self::Error>,     D: IntoFuture<Error = Self::Error>,

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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 as IntoFuture>::Future, <C as IntoFuture>::Future, <D as IntoFuture>::Future, <E as IntoFuture>::Future> where     B: IntoFuture<Error = Self::Error>,     C: IntoFuture<Error = Self::Error>,     D: IntoFuture<Error = Self::Error>,     E: IntoFuture<Error = Self::Error>,

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Same as join, but with more futures.

fn into_stream(self) -> IntoStream<Self>

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Convert this future into a single element stream.

fn flatten(self) -> Flatten<Self> where     Self::Item: IntoFuture,     <Self::Item as IntoFuture>::Error: From<Self::Error>,

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

fn flatten_stream(self) -> FlattenStream<Self> where     Self::Item: Stream,     <Self::Item as Stream>::Error == Self::Error,

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

fn fuse(self) -> Fuse<Self>

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Fuse a future such that poll will never again be called once it has completed.

fn inspect<F>(self, f: F) -> Inspect<Self, F> where     F: FnOnce(&Self::Item),

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Do something with the item of a future, passing it on.

fn catch_unwind(self) -> CatchUnwind<Self> where     Self: UnwindSafe,

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Catches unwinding panics while polling the future.

fn shared(self) -> Shared<Self>

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

impl<A, B, F> Debug for OrElse<A, B, F> where     A: Debug + Future,     B: Debug + IntoFuture,     F: Debug,     <B as IntoFuture>::Future: Debug,

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fn fmt(&self, f: &mut Formatter) -> Result<(), Error>

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Formats the value using the given formatter.