Struct futures::stream::StreamFuture

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#[must_use = "futures do nothing unless polled"]
pub struct StreamFuture<S> { /* fields omitted */ }

[−] Expand description

A combinator used to temporarily convert a stream into a future.

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

Methods

impl<S> StreamFuture<S>

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pub fn get_ref(&self) -> Option<&S>

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Acquires a reference to the underlying stream that this combinator is pulling from.

This method returns an Option to account for the fact that StreamFuture's implementation of Future::poll consumes the underlying stream during polling in order to return it to the caller of Future::poll if the stream yielded an element.

pub fn get_mut(&mut self) -> Option<&mut S>

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Acquires a mutable reference to the underlying stream that this combinator is pulling from.

Note that care must be taken to avoid tampering with the state of the stream which may otherwise confuse this combinator.

This method returns an Option to account for the fact that StreamFuture's implementation of Future::poll consumes the underlying stream during polling in order to return it to the caller of Future::poll if the stream yielded an element.

pub fn into_inner(self) -> Option<S>

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Consumes this combinator, returning the underlying stream.

Note that this may discard intermediate state of this combinator, so care should be taken to avoid losing resources when this is called.

This method returns an Option to account for the fact that StreamFuture's implementation of Future::poll consumes the underlying stream during polling in order to return it to the caller of Future::poll if the stream yielded an element.

Trait Implementations

impl<S: Stream> Future for StreamFuture<S>

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type Item = (Option<S::Item>, S)

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

type Error = (S::Error, S)

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

fn poll(&mut self) -> Poll<Self::Item, Self::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> where     Self: Sized,

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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,     Self: Sized,

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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,     Self: Sized,

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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,

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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     F: FnOnce(Result<Self::Item, Self::Error>) -> B,     B: IntoFuture,     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.

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,

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

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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,

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Waits for either one of two futures to complete.

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

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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,

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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::Future, C::Future> where     B: IntoFuture<Error = Self::Error>,     C: IntoFuture<Error = Self::Error>,     Self: Sized,

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

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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::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,

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Same as join, but with more futures.

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

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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>,     Self: Sized,

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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<Error = Self::Error>,     Self: Sized,

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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> where     Self: Sized,

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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),     Self: Sized,

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

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

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Catches unwinding panics while polling the future.

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

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

impl<S: Debug> Debug for StreamFuture<S>

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

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Formats the value using the given formatter.