[−][src]Struct futures_util::stream::Fold

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

pub struct Fold<St, Fut, T, F> { /* fields omitted */ }

A future used to collect all the results of a stream into one generic type.

This future is returned by the Stream::fold method.

Trait Implementations

impl<St: Debug, Fut: Debug, T: Debug, F: Debug> Debug for Fold<St, Fut, T, F>
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impl<St: Unpin, Fut: Unpin, T, F> Unpin for Fold<St, Fut, T, F>
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impl<St, Fut, T, F> Future for Fold<St, Fut, T, F> where
    St: Stream,
    F: FnMut(T, St::Item) -> Fut,
    Fut: Future<Output = T>, 
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type Output = T

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

futures in libcore are unstable

The result of the Future.

impl<St, Fut, T, F> FusedFuture for Fold<St, Fut, T, F>
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Auto Trait Implementations

impl<St, Fut, T, F> Send for Fold<St, Fut, T, F> where
    F: Send,
    Fut: Send,
    St: Send,
    T: Send, 

impl<St, Fut, T, F> Sync for Fold<St, Fut, T, F> where
    F: Sync,
    Fut: Sync,
    St: Sync,
    T: Sync, 

Blanket Implementations

impl<T> FutureExt for T where
    T: Future + ?Sized, 
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fn map<U, F>(self, f: F) -> Map<Self, F> where
    F: FnOnce(Self::Output) -> U,
    Self: Sized, 
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Map this future's output to a different type, returning a new future of the resulting type. Read more

fn then<Fut, F>(self, f: F) -> Then<Self, Fut, F> where
    F: FnOnce(Self::Output) -> Fut,
    Fut: Future,
    Self: Sized, 
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Chain on a computation for when a future finished, passing the result of the future to the provided closure f. Read more

fn join<Fut2>(self, other: Fut2) -> Join<Self, Fut2> where
    Fut2: Future,
    Self: Sized, 
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Joins the result of two futures, waiting for them both to complete. Read more

fn join3<Fut2, Fut3>(
    self,
    future2: Fut2,
    future3: Fut3
) -> Join3<Self, Fut2, Fut3> where
    Fut2: Future,
    Fut3: Future,
    Self: Sized, 
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Same as join, but with more futures. Read more

fn join4<Fut2, Fut3, Fut4>(
    self,
    future2: Fut2,
    future3: Fut3,
    future4: Fut4
) -> Join4<Self, Fut2, Fut3, Fut4> where
    Fut2: Future,
    Fut3: Future,
    Fut3: Future,
    Fut4: Future,
    Self: Sized, 
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Same as join, but with more futures. Read more

fn join5<Fut2, Fut3, Fut4, Fut5>(
    self,
    future2: Fut2,
    future3: Fut3,
    future4: Fut4,
    future5: Fut5
) -> Join5<Self, Fut2, Fut3, Fut4, Fut5> where
    Fut2: Future,
    Fut3: Future,
    Fut3: Future,
    Fut4: Future,
    Fut5: Future,
    Self: Sized, 
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Same as join, but with more futures. Read more

fn into_stream(self) -> IntoStream<Self> where
    Self: Sized, 
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Convert this future into a single element stream. Read more

fn flatten(self) -> Flatten<Self> where
    Self::Output: Future,
    Self: Sized, 
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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,
    Self: Sized, 
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Flatten the execution of this future when the successful result of this future is a stream. Read more

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

fn inspect<F>(self, f: F) -> Inspect<Self, F> where
    F: FnOnce(&Self::Output),
    Self: Sized, 
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Do something with the output of a future before passing it on. Read more

fn catch_unwind(self) -> CatchUnwind<Self> where
    Self: Sized + UnwindSafe, 
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Catches unwinding panics while polling the future. Read more

fn shared(self) -> Shared<Self> where
    Self: Sized,
    Self::Output: Clone, 
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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>) where
    Self: Sized, 
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Turn this future into a future that yields () on completion and sends its output to another future on a separate task. Read more

fn boxed(self) -> Pin<Box<Self>> where
    Self: Sized, 
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Wrap the future in a Box, pinning it.

fn unit_error(self) -> UnitError<Self> where
    Self: Sized, 
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Turns a Future into a TryFuture with Error = ().

fn poll_unpin(&mut self, lw: &LocalWaker) -> Poll<Self::Output> where
    Self: Unpin + Sized, 
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A convenience for calling Future::poll on Unpin future types.

impl<Fut> TryFutureExt for Fut where
    Fut: TryFuture, 
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fn flatten_sink(self) -> FlattenSink<Self, Self::Ok> where
    Self::Ok: Sink<SinkError = Self::Error>,
    Self: Sized, 
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Flattens the execution of this future when the successful result of this future is a Sink. Read more

fn map_ok<T, F>(self, f: F) -> MapOk<Self, F> where
    F: FnOnce(Self::Ok) -> T,
    Self: Sized, 
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Maps this future's success value to a different value. Read more

fn map_err<E, F>(self, f: F) -> MapErr<Self, F> where
    F: FnOnce(Self::Error) -> E,
    Self: Sized, 
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Maps this future's error value to a different value. Read more

fn err_into<E>(self) -> ErrInto<Self, E> where
    Self: Sized,
    Self::Error: Into<E>, 
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Maps this future's Error to a new error type using the Into trait. Read more

fn and_then<Fut, F>(self, f: F) -> AndThen<Self, Fut, F> where
    F: FnOnce(Self::Ok) -> Fut,
    Fut: TryFuture<Error = Self::Error>,
    Self: Sized, 
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Executes another future after this one resolves successfully. The success value is passed to a closure to create this subsequent future. Read more

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

fn unwrap_or_else<F>(self, f: F) -> UnwrapOrElse<Self, F> where
    Self: Sized,
    F: FnOnce(Self::Error) -> Self::Ok, 
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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: Sized + Unpin, 
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Wraps a TryFuture into a future compatable with libraries using futures 0.1 future definitons. Requires the compat feature to enable. Read more

fn into_future(self) -> IntoFuture<Self> where
    Self: Sized, 
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Wraps a TryFuture into a type that implements Future. Read more

fn try_join<Fut2>(self, other: Fut2) -> TryJoin<Self, Fut2> where
    Fut2: TryFuture<Error = Self::Error>,
    Self: Sized, 
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Joins the result of two futures, waiting for them both to complete or for one to produce an error. Read more

fn try_join3<Fut2, Fut3>(
    self,
    future2: Fut2,
    future3: Fut3
) -> TryJoin3<Self, Fut2, Fut3> where
    Fut2: TryFuture<Error = Self::Error>,
    Fut3: TryFuture<Error = Self::Error>,
    Self: Sized, 
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Same as try_join, but with more futures. Read more

fn try_join4<Fut2, Fut3, Fut4>(
    self,
    future2: Fut2,
    future3: Fut3,
    future4: Fut4
) -> TryJoin4<Self, Fut2, Fut3, Fut4> where
    Fut2: TryFuture<Error = Self::Error>,
    Fut3: TryFuture<Error = Self::Error>,
    Fut4: TryFuture<Error = Self::Error>,
    Self: Sized, 
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Same as try_join, but with more futures. Read more

fn try_join5<Fut2, Fut3, Fut4, Fut5>(
    self,
    future2: Fut2,
    future3: Fut3,
    future4: Fut4,
    future5: Fut5
) -> TryJoin5<Self, Fut2, Fut3, Fut4, Fut5> where
    Fut2: TryFuture<Error = Self::Error>,
    Fut3: TryFuture<Error = Self::Error>,
    Fut4: TryFuture<Error = Self::Error>,
    Fut5: TryFuture<Error = Self::Error>,
    Self: Sized, 
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Same as try_join, but with more futures. Read more

impl<T> From for T
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impl<T, U> Into for T where
    U: From<T>, 
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impl<T, U> TryFrom for T where
    T: From<U>, 
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type Error = !

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

The type returned in the event of a conversion error.

impl<T> Borrow for T where
    T: ?Sized, 
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impl<T> Any for T where
    T: 'static + ?Sized, 
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impl<T> BorrowMut for T where
    T: ?Sized, 
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impl<T, U> TryInto for T where
    U: TryFrom<T>, 
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type Error = <U as TryFrom<T>>::Error

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

The type returned in the event of a conversion error.

impl<F, T, E> TryFuture for F where
    F: Future<Output = Result<T, E>>, 
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type Ok = T

The type of successful values yielded by this future

type Error = E

The type of failures yielded by this future