Struct futures::future::FromErr

#[must_use = "futures do nothing unless polled"]
pub struct FromErr<A, E> where A: Future { /* fields omitted */ }

Future for the from_err combinator, changing the error type of a future.

This is created by the Future::from_err method.

Trait Implementations

impl<A: Debug, E: Debug> Debug for FromErr<A, E> where A: Future

fn fmt(&self, __arg_0: &mut Formatter) -> Result

Formats the value using the given formatter.

impl<A: Future, E: From<A::Error>> Future for FromErr<A, E>

type Item = A::Item

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

type Error = E

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

fn poll(&mut self) -> Poll<A::Item, E>

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> where Self: Sized

Block the current thread until this future is resolved.

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.

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.

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.

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.

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

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 F: FnOnce(Self::Item) -> B,
        B: IntoFuture<Error=Self::Error>,
        Self: Sized

Execute another future after this one has resolved successfully.

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

Execute another future if this one resolves with an error.

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.

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.

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.

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

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

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

Same as join, but with more futures.

fn into_stream(self) -> IntoStream<Self> where Self: Sized

Convert this future into a single element stream.

fn flatten(self) -> Flatten<Self> where Self::Item: IntoFuture,
        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.

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.

fn fuse(self) -> Fuse<Self> where Self: Sized

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

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

Catches unwinding panics while polling the future.

fn shared(self) -> Shared<Self> where Self: Sized

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