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

#[must_use = "streams do nothing unless polled"]
pub struct Map<St, F> { /* fields omitted */ }
Expand description

Stream for the map method.

Implementations

impl<St, F> Map<St, F>[src]

pub fn get_ref(&self) -> &St[src]

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

pub fn get_mut(&mut self) -> &mut St[src]

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

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

pub fn get_pin_mut(self: Pin<&mut Self>) -> Pin<&mut St>ⓘ

Notable traits for Pin<P>

impl<P> Future for Pin<P> where
    P: Unpin + DerefMut,
    <P as Deref>::Target: Future,  type Output = <<P as Deref>::Target as Future>::Output;
[src]

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

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

pub fn into_inner(self) -> St[src]

Consumes this combinator, returning the underlying sink or stream.

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

Trait Implementations

impl<St, F> Debug for Map<St, F> where
    St: Debug, [src]

fn fmt(&self, f: &mut Formatter<'_>) -> Result[src]

Formats the value using the given formatter. Read more

impl<St, F> FusedStream for Map<St, F> where
    St: FusedStream,
    F: FnMut1<St::Item>, [src]

fn is_terminated(&self) -> bool[src]

Returns true if the stream should no longer be polled.

impl<St, F, Item> Sink<Item> for Map<St, F> where
    St: Stream + Sink<Item>,
    F: FnMut1<St::Item>, [src]

type Error = St::Error

The type of value produced by the sink when an error occurs.

fn poll_ready(
    self: Pin<&mut Self>,
    cx: &mut Context<'_>
) -> Poll<Result<(), Self::Error>>[src]

Attempts to prepare the Sink to receive a value. Read more

fn start_send(self: Pin<&mut Self>, item: Item) -> Result<(), Self::Error>[src]

Begin the process of sending a value to the sink. Each call to this function must be preceded by a successful call to poll_ready which returned Poll::Ready(Ok(())). Read more

fn poll_flush(
    self: Pin<&mut Self>,
    cx: &mut Context<'_>
) -> Poll<Result<(), Self::Error>>[src]

Flush any remaining output from this sink. Read more

fn poll_close(
    self: Pin<&mut Self>,
    cx: &mut Context<'_>
) -> Poll<Result<(), Self::Error>>[src]

Flush any remaining output and close this sink, if necessary. Read more

impl<St, F> Stream for Map<St, F> where
    St: Stream,
    F: FnMut1<St::Item>, [src]

type Item = F::Output

Values yielded by the stream.

fn poll_next(
    self: Pin<&mut Self>,
    cx: &mut Context<'_>
) -> Poll<Option<Self::Item>>[src]

Attempt to pull out the next value of this stream, registering the current task for wakeup if the value is not yet available, and returning None if the stream is exhausted. Read more

fn size_hint(&self) -> (usize, Option<usize>)[src]

Returns the bounds on the remaining length of the stream. Read more

impl<'__pin, St, F> Unpin for Map<St, F> where
    __Origin<'__pin, St, F>: Unpin, [src]

Auto Trait Implementations

impl<St, F> RefUnwindSafe for Map<St, F> where
    F: RefUnwindSafe,
    St: RefUnwindSafe, 

impl<St, F> Send for Map<St, F> where
    F: Send,
    St: Send, 

impl<St, F> Sync for Map<St, F> where
    F: Sync,
    St: Sync, 

impl<St, F> UnwindSafe for Map<St, F> where
    F: UnwindSafe,
    St: UnwindSafe, 

Blanket Implementations

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

pub fn type_id(&self) -> TypeId[src]

Gets the TypeId of self. Read more

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

pub fn borrow(&self) -> &T[src]

Immutably borrows from an owned value. Read more

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

pub fn borrow_mut(&mut self) -> &mut T[src]

Mutably borrows from an owned value. Read more

impl<T> From<T> for T[src]

pub fn from(t: T) -> T[src]

Performs the conversion.

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

pub fn into(self) -> U[src]

Performs the conversion.

impl<T, Item> SinkExt<Item> for T where
    T: Sink<Item> + ?Sized, [src]

fn with<U, Fut, F, E>(self, f: F) -> With<Self, Item, U, Fut, F> where
    F: FnMut(U) -> Fut,
    Fut: Future<Output = Result<Item, E>>,
    E: From<Self::Error>,
    Self: Sized, [src]

This is supported on crate feature sink only.

Composes a function in front of the sink. Read more

fn with_flat_map<U, St, F>(self, f: F) -> WithFlatMap<Self, Item, U, St, F> where
    F: FnMut(U) -> St,
    St: Stream<Item = Result<Item, Self::Error>>,
    Self: Sized, [src]

This is supported on crate feature sink only.

Composes a function in front of the sink. Read more

fn sink_map_err<E, F>(self, f: F) -> SinkMapErr<Self, F> where
    F: FnOnce(Self::Error) -> E,
    Self: Sized, [src]

This is supported on crate feature sink only.

Transforms the error returned by the sink.

fn sink_err_into<E>(self) -> SinkErrInto<Self, Item, E> where
    Self: Sized,
    Self::Error: Into<E>, [src]

This is supported on crate feature sink only.

Map this sink’s error to a different error type using the Into trait. Read more

fn buffer(self, capacity: usize) -> Buffer<Self, Item> where
    Self: Sized, [src]

This is supported on crate feature sink only.

Adds a fixed-size buffer to the current sink. Read more

fn close(&mut self) -> Close<'_, Self, Item>ⓘ

Notable traits for Close<'_, Si, Item>

impl<Si: Sink<Item> + Unpin + ?Sized, Item> Future for Close<'_, Si, Item> type Output = Result<(), Si::Error>;
 where
    Self: Unpin, [src]

This is supported on crate feature sink only.

Close the sink.

fn fanout<Si>(self, other: Si) -> Fanout<Self, Si> where
    Self: Sized,
    Item: Clone,
    Si: Sink<Item, Error = Self::Error>, [src]

This is supported on crate feature sink only.

Fanout items to multiple sinks. Read more

fn flush(&mut self) -> Flush<'_, Self, Item>ⓘ

Notable traits for Flush<'_, Si, Item>

impl<Si: Sink<Item> + Unpin + ?Sized, Item> Future for Flush<'_, Si, Item> type Output = Result<(), Si::Error>;
 where
    Self: Unpin, [src]

This is supported on crate feature sink only.

Flush the sink, processing all pending items. Read more

fn send(&mut self, item: Item) -> Send<'_, Self, Item>ⓘ

Notable traits for Send<'_, Si, Item>

impl<Si: Sink<Item> + Unpin + ?Sized, Item> Future for Send<'_, Si, Item> type Output = Result<(), Si::Error>;
 where
    Self: Unpin, [src]

This is supported on crate feature sink only.

A future that completes after the given item has been fully processed into the sink, including flushing. Read more

fn feed(&mut self, item: Item) -> Feed<'_, Self, Item>ⓘ

Notable traits for Feed<'_, Si, Item>

impl<Si: Sink<Item> + Unpin + ?Sized, Item> Future for Feed<'_, Si, Item> type Output = Result<(), Si::Error>;
 where
    Self: Unpin, [src]

This is supported on crate feature sink only.

A future that completes after the given item has been received by the sink. Read more

fn send_all<'a, St: ?Sized>(
    &'a mut self,
    stream: &'a mut St
) -> SendAll<'a, Self, St>ⓘ

Notable traits for SendAll<'_, Si, St>

impl<Si: ?Sized, St: ?Sized, Ok, Error> Future for SendAll<'_, Si, St> where
    Si: Sink<Ok, Error = Error> + Unpin,
    St: Stream<Item = Result<Ok, Error>> + Unpin,  type Output = Result<(), Error>;
 where
    St: TryStream<Ok = Item, Error = Self::Error> + Stream + Unpin,
    Self: Unpin, [src]

This is supported on crate feature sink only.

A future that completes after the given stream has been fully processed into the sink, including flushing. Read more

fn left_sink<Si2>(self) -> Either<Self, Si2>ⓘ

Notable traits for Either<A, B>

impl<A, B> Future for Either<A, B> where
    A: Future,
    B: Future<Output = A::Output>,  type Output = A::Output;
 where
    Si2: Sink<Item, Error = Self::Error>,
    Self: Sized, [src]

This is supported on crate feature sink only.

Wrap this sink in an Either sink, making it the left-hand variant of that Either. Read more

fn right_sink<Si1>(self) -> Either<Si1, Self>ⓘ

Notable traits for Either<A, B>

impl<A, B> Future for Either<A, B> where
    A: Future,
    B: Future<Output = A::Output>,  type Output = A::Output;
 where
    Si1: Sink<Item, Error = Self::Error>,
    Self: Sized, [src]

This is supported on crate feature sink only.

Wrap this stream in an Either stream, making it the right-hand variant of that Either. Read more

fn compat(self) -> CompatSink<Self, Item> where
    Self: Sized + Unpin, [src]

This is supported on crate features sink and compat only.

Wraps a Sink into a sink compatible with libraries using futures 0.1 Sink. Requires the compat feature to be enabled. Read more

fn poll_ready_unpin(
    &mut self,
    cx: &mut Context<'_>
) -> Poll<Result<(), Self::Error>> where
    Self: Unpin, [src]

This is supported on crate feature sink only.

A convenience method for calling Sink::poll_ready on Unpin sink types. Read more

fn start_send_unpin(&mut self, item: Item) -> Result<(), Self::Error> where
    Self: Unpin, [src]

This is supported on crate feature sink only.

A convenience method for calling Sink::start_send on Unpin sink types. Read more

fn poll_flush_unpin(
    &mut self,
    cx: &mut Context<'_>
) -> Poll<Result<(), Self::Error>> where
    Self: Unpin, [src]

This is supported on crate feature sink only.

A convenience method for calling Sink::poll_flush on Unpin sink types. Read more

fn poll_close_unpin(
    &mut self,
    cx: &mut Context<'_>
) -> Poll<Result<(), Self::Error>> where
    Self: Unpin, [src]

This is supported on crate feature sink only.

A convenience method for calling Sink::poll_close on Unpin sink types. Read more

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

type Error = Infallible

The type returned in the event of a conversion error.

pub fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>[src]

Performs the conversion.

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

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

The type returned in the event of a conversion error.

pub fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>[src]

Performs the conversion.

impl<S, T, E> TryStream for S where
    S: Stream<Item = Result<T, E>> + ?Sized, [src]

type Ok = T

The type of successful values yielded by this future

type Error = E

The type of failures yielded by this future

pub fn try_poll_next(
    self: Pin<&mut S>,
    cx: &mut Context<'_>
) -> Poll<Option<Result<<S as TryStream>::Ok, <S as TryStream>::Error>>>[src]

Poll this TryStream as if it were a Stream. Read more