pub struct Then<S, F, U>where
U: IntoFuture,{ /* private fields */ }
Expand description
A stream combinator which chains a computation onto each item produced by a stream.
This structure is produced by the Stream::then
method.
Trait Implementations§
source§impl<S, F, U> Debug for Then<S, F, U>where
S: Debug,
F: Debug,
U: Debug + IntoFuture,
<U as IntoFuture>::Future: Debug,
impl<S, F, U> Debug for Then<S, F, U>where
S: Debug,
F: Debug,
U: Debug + IntoFuture,
<U as IntoFuture>::Future: Debug,
source§impl<S, F, U> Sink for Then<S, F, U>where
S: Sink,
U: IntoFuture,
impl<S, F, U> Sink for Then<S, F, U>where
S: Sink,
U: IntoFuture,
§type SinkError = <S as Sink>::SinkError
type SinkError = <S as Sink>::SinkError
The type of value produced by the sink when an error occurs.
source§fn start_send(
&mut self,
item: <S as Sink>::SinkItem
) -> Result<AsyncSink<<S as Sink>::SinkItem>, <S as Sink>::SinkError>
fn start_send(
&mut self,
item: <S as Sink>::SinkItem
) -> Result<AsyncSink<<S as Sink>::SinkItem>, <S as Sink>::SinkError>
Begin the process of sending a value to the sink. Read more
source§fn poll_complete(&mut self) -> Result<Async<()>, <S as Sink>::SinkError>
fn poll_complete(&mut self) -> Result<Async<()>, <S as Sink>::SinkError>
Flush all output from this sink, if necessary. Read more
source§fn close(&mut self) -> Result<Async<()>, <S as Sink>::SinkError>
fn close(&mut self) -> Result<Async<()>, <S as Sink>::SinkError>
A method to indicate that no more values will ever be pushed into this
sink. Read more
source§fn wait(self) -> Wait<Self>where
Self: Sized,
fn wait(self) -> Wait<Self>where
Self: Sized,
Creates a new object which will produce a synchronous sink. Read more
source§fn with<U, F, Fut>(self, f: F) -> With<Self, U, F, Fut>where
F: FnMut(U) -> Fut,
Fut: IntoFuture<Item = Self::SinkItem>,
<Fut as IntoFuture>::Error: From<Self::SinkError>,
Self: Sized,
fn with<U, F, Fut>(self, f: F) -> With<Self, U, F, Fut>where
F: FnMut(U) -> Fut,
Fut: IntoFuture<Item = Self::SinkItem>,
<Fut as IntoFuture>::Error: From<Self::SinkError>,
Self: Sized,
Composes a function in front of the sink. Read more
source§fn with_flat_map<U, F, St>(self, f: F) -> WithFlatMap<Self, U, F, St>where
F: FnMut(U) -> St,
St: Stream<Item = Self::SinkItem, Error = Self::SinkError>,
Self: Sized,
fn with_flat_map<U, F, St>(self, f: F) -> WithFlatMap<Self, U, F, St>where
F: FnMut(U) -> St,
St: Stream<Item = Self::SinkItem, Error = Self::SinkError>,
Self: Sized,
Composes a function in front of the sink. Read more
source§fn sink_map_err<F, E>(self, f: F) -> SinkMapErr<Self, F>where
F: FnOnce(Self::SinkError) -> E,
Self: Sized,
fn sink_map_err<F, E>(self, f: F) -> SinkMapErr<Self, F>where
F: FnOnce(Self::SinkError) -> E,
Self: Sized,
Transforms the error returned by the sink.
source§fn sink_from_err<E>(self) -> SinkFromErr<Self, E>where
E: From<Self::SinkError>,
Self: Sized,
fn sink_from_err<E>(self) -> SinkFromErr<Self, E>where
E: From<Self::SinkError>,
Self: Sized,
Map this sink’s error to any error implementing
From
for this sink’s
Error
, returning a new sink. Read moresource§fn buffer(self, amt: usize) -> Buffer<Self>where
Self: Sized,
fn buffer(self, amt: usize) -> Buffer<Self>where
Self: Sized,
Adds a fixed-size buffer to the current sink. Read more
source§fn flush(self) -> Flush<Self>where
Self: Sized,
fn flush(self) -> Flush<Self>where
Self: Sized,
A future that completes when the sink has finished processing all
pending requests. Read more
source§impl<S, F, U> Stream for Then<S, F, U>where
S: Stream,
F: FnMut(Result<<S as Stream>::Item, <S as Stream>::Error>) -> U,
U: IntoFuture,
impl<S, F, U> Stream for Then<S, F, U>where
S: Stream,
F: FnMut(Result<<S as Stream>::Item, <S as Stream>::Error>) -> U,
U: IntoFuture,
§type Item = <U as IntoFuture>::Item
type Item = <U as IntoFuture>::Item
The type of item this stream will yield on success.
§type Error = <U as IntoFuture>::Error
type Error = <U as IntoFuture>::Error
The type of error this stream may generate.
source§fn poll(
&mut self
) -> Result<Async<Option<<U as IntoFuture>::Item>>, <U as IntoFuture>::Error>
fn poll(
&mut self
) -> Result<Async<Option<<U as IntoFuture>::Item>>, <U as IntoFuture>::Error>
Attempt to pull out the next value of this stream, returning
None
if
the stream is finished. Read moresource§fn wait(self) -> Wait<Self> ⓘwhere
Self: Sized,
fn wait(self) -> Wait<Self> ⓘwhere
Self: Sized,
Creates an iterator which blocks the current thread until each item of
this stream is resolved. Read more
source§fn into_future(self) -> StreamFuture<Self>where
Self: Sized,
fn into_future(self) -> StreamFuture<Self>where
Self: Sized,
Converts this stream into a
Future
. Read moresource§fn map_err<U, F>(self, f: F) -> MapErr<Self, F>where
F: FnMut(Self::Error) -> U,
Self: Sized,
fn map_err<U, F>(self, f: F) -> MapErr<Self, F>where
F: FnMut(Self::Error) -> U,
Self: Sized,
source§fn filter<F>(self, f: F) -> Filter<Self, F>where
F: FnMut(&Self::Item) -> bool,
Self: Sized,
fn filter<F>(self, f: F) -> Filter<Self, F>where
F: FnMut(&Self::Item) -> bool,
Self: Sized,
Filters the values produced by this stream according to the provided
predicate. Read more
source§fn filter_map<F, B>(self, f: F) -> FilterMap<Self, F>where
F: FnMut(Self::Item) -> Option<B>,
Self: Sized,
fn filter_map<F, B>(self, f: F) -> FilterMap<Self, F>where
F: FnMut(Self::Item) -> Option<B>,
Self: Sized,
Filters the values produced by this stream while simultaneously mapping
them to a different type. Read more
source§fn then<F, U>(self, f: F) -> Then<Self, F, U>where
F: FnMut(Result<Self::Item, Self::Error>) -> U,
U: IntoFuture,
Self: Sized,
fn then<F, U>(self, f: F) -> Then<Self, F, U>where
F: FnMut(Result<Self::Item, Self::Error>) -> U,
U: IntoFuture,
Self: Sized,
Chain on a computation for when a value is ready, passing the resulting
item to the provided closure
f
. Read moresource§fn and_then<F, U>(self, f: F) -> AndThen<Self, F, U>where
F: FnMut(Self::Item) -> U,
U: IntoFuture<Error = Self::Error>,
Self: Sized,
fn and_then<F, U>(self, f: F) -> AndThen<Self, F, U>where
F: FnMut(Self::Item) -> U,
U: IntoFuture<Error = Self::Error>,
Self: Sized,
Chain on a computation for when a value is ready, passing the successful
results to the provided closure
f
. Read moresource§fn or_else<F, U>(self, f: F) -> OrElse<Self, F, U>where
F: FnMut(Self::Error) -> U,
U: IntoFuture<Item = Self::Item>,
Self: Sized,
fn or_else<F, U>(self, f: F) -> OrElse<Self, F, U>where
F: FnMut(Self::Error) -> U,
U: IntoFuture<Item = Self::Item>,
Self: Sized,
Chain on a computation for when an error happens, passing the
erroneous result to the provided closure
f
. Read moresource§fn collect(self) -> Collect<Self>where
Self: Sized,
fn collect(self) -> Collect<Self>where
Self: Sized,
Collect all of the values of this stream into a vector, returning a
future representing the result of that computation. Read more
source§fn fold<F, T, Fut>(self, init: T, f: F) -> Fold<Self, F, Fut, T>where
F: FnMut(T, Self::Item) -> Fut,
Fut: IntoFuture<Item = T>,
Self::Error: From<<Fut as IntoFuture>::Error>,
Self: Sized,
fn fold<F, T, Fut>(self, init: T, f: F) -> Fold<Self, F, Fut, T>where
F: FnMut(T, Self::Item) -> Fut,
Fut: IntoFuture<Item = T>,
Self::Error: From<<Fut as IntoFuture>::Error>,
Self: Sized,
Execute an accumulating computation over a stream, collecting all the
values into one final result. Read more
source§fn skip_while<P, R>(self, pred: P) -> SkipWhile<Self, P, R>where
P: FnMut(&Self::Item) -> R,
R: IntoFuture<Item = bool, Error = Self::Error>,
Self: Sized,
fn skip_while<P, R>(self, pred: P) -> SkipWhile<Self, P, R>where
P: FnMut(&Self::Item) -> R,
R: IntoFuture<Item = bool, Error = Self::Error>,
Self: Sized,
Skip elements on this stream while the predicate provided resolves to
true
. Read moresource§fn take_while<P, R>(self, pred: P) -> TakeWhile<Self, P, R>where
P: FnMut(&Self::Item) -> R,
R: IntoFuture<Item = bool, Error = Self::Error>,
Self: Sized,
fn take_while<P, R>(self, pred: P) -> TakeWhile<Self, P, R>where
P: FnMut(&Self::Item) -> R,
R: IntoFuture<Item = bool, Error = Self::Error>,
Self: Sized,
Take elements from this stream while the predicate provided resolves to
true
. Read moresource§fn for_each<F, U>(self, f: F) -> ForEach<Self, F, U>where
F: FnMut(Self::Item) -> U,
U: IntoFuture<Item = (), Error = Self::Error>,
Self: Sized,
fn for_each<F, U>(self, f: F) -> ForEach<Self, F, U>where
F: FnMut(Self::Item) -> U,
U: IntoFuture<Item = (), Error = Self::Error>,
Self: Sized,
Runs this stream to completion, executing the provided closure for each
element on the stream. Read more
source§fn from_err<E>(self) -> FromErr<Self, E>where
E: From<Self::Error>,
Self: Sized,
fn from_err<E>(self) -> FromErr<Self, E>where
E: From<Self::Error>,
Self: Sized,
Map this stream’s error to any error implementing
From
for
this stream’s Error
, returning a new stream. Read moresource§fn take(self, amt: u64) -> Take<Self>where
Self: Sized,
fn take(self, amt: u64) -> Take<Self>where
Self: Sized,
Creates a new stream of at most
amt
items of the underlying stream. Read moresource§fn skip(self, amt: u64) -> Skip<Self>where
Self: Sized,
fn skip(self, amt: u64) -> Skip<Self>where
Self: Sized,
Creates a new stream which skips
amt
items of the underlying stream. Read moresource§fn fuse(self) -> Fuse<Self>where
Self: Sized,
fn fuse(self) -> Fuse<Self>where
Self: Sized,
Fuse a stream such that
poll
will never again be called once it has
finished. Read moresource§fn by_ref(&mut self) -> &mut Selfwhere
Self: Sized,
fn by_ref(&mut self) -> &mut Selfwhere
Self: Sized,
Borrows a stream, rather than consuming it. Read more
source§fn merge<S>(self, other: S) -> Merge<Self, S>where
S: Stream<Error = Self::Error>,
Self: Sized,
fn merge<S>(self, other: S) -> Merge<Self, S>where
S: Stream<Error = Self::Error>,
Self: Sized,
👎Deprecated: functionality provided by
select
nowAn adapter for merging the output of two streams. Read more
source§fn zip<S>(self, other: S) -> Zip<Self, S>where
S: Stream<Error = Self::Error>,
Self: Sized,
fn zip<S>(self, other: S) -> Zip<Self, S>where
S: Stream<Error = Self::Error>,
Self: Sized,
An adapter for zipping two streams together. Read more
source§fn chain<S>(self, other: S) -> Chain<Self, S>where
S: Stream<Item = Self::Item, Error = Self::Error>,
Self: Sized,
fn chain<S>(self, other: S) -> Chain<Self, S>where
S: Stream<Item = Self::Item, Error = Self::Error>,
Self: Sized,
Adapter for chaining two stream. Read more
source§fn peekable(self) -> Peekable<Self>where
Self: Sized,
fn peekable(self) -> Peekable<Self>where
Self: Sized,
Creates a new stream which exposes a
peek
method. Read moresource§fn chunks(self, capacity: usize) -> Chunks<Self>where
Self: Sized,
fn chunks(self, capacity: usize) -> Chunks<Self>where
Self: Sized,
An adaptor for chunking up items of the stream inside a vector. Read more
source§fn select<S>(self, other: S) -> Select<Self, S>where
S: Stream<Item = Self::Item, Error = Self::Error>,
Self: Sized,
fn select<S>(self, other: S) -> Select<Self, S>where
S: Stream<Item = Self::Item, Error = Self::Error>,
Self: Sized,
Creates a stream that selects the next element from either this stream
or the provided one, whichever is ready first. Read more
source§fn forward<S>(self, sink: S) -> Forward<Self, S>where
S: Sink<SinkItem = Self::Item>,
Self::Error: From<<S as Sink>::SinkError>,
Self: Sized,
fn forward<S>(self, sink: S) -> Forward<Self, S>where
S: Sink<SinkItem = Self::Item>,
Self::Error: From<<S as Sink>::SinkError>,
Self: Sized,
A future that completes after the given stream has been fully processed
into the sink, including flushing. Read more
source§fn inspect<F>(self, f: F) -> Inspect<Self, F>where
F: FnMut(&Self::Item),
Self: Sized,
fn inspect<F>(self, f: F) -> Inspect<Self, F>where
F: FnMut(&Self::Item),
Self: Sized,
Do something with each item of this stream, afterwards passing it on. Read more
source§fn inspect_err<F>(self, f: F) -> InspectErr<Self, F>where
F: FnMut(&Self::Error),
Self: Sized,
fn inspect_err<F>(self, f: F) -> InspectErr<Self, F>where
F: FnMut(&Self::Error),
Self: Sized,
Do something with the error of this stream, afterwards passing it on. Read more