Struct futures::stream::FilterMap
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#[must_use = "streams do nothing unless polled"]pub struct FilterMap<S, F> { /* fields omitted */ }
A combinator used to filter the results of a stream and simultaneously map them to a different type.
This structure is returned by the Stream::filter_map
method.
Trait Implementations
impl<S: Debug, F: Debug> Debug for FilterMap<S, F>
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impl<S, F> Sink for FilterMap<S, F> where S: Sink
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type SinkItem = S::SinkItem
The type of value that the sink accepts.
type SinkError = S::SinkError
The type of value produced by the sink when an error occurs.
fn start_send(&mut self,
item: S::SinkItem)
-> StartSend<S::SinkItem, S::SinkError>
item: S::SinkItem)
-> StartSend<S::SinkItem, S::SinkError>
Begin the process of sending a value to the sink. Read more
fn poll_complete(&mut self) -> Poll<(), S::SinkError>
Flush all output from this sink, if necessary. Read more
fn close(&mut self) -> Poll<(), S::SinkError>
A method to indicate that no more values will ever be pushed into this sink. Read more
fn wait(self) -> Wait<Self> where Self: Sized
Creates a new object which will produce a synchronous sink. Read more
fn with<U, F, Fut>(self, f: F) -> With<Self, U, F, Fut> where F: FnMut(U) -> Fut,
Fut: IntoFuture<Item=Self::SinkItem>,
Fut::Error: From<Self::SinkError>,
Self: Sized
Fut: IntoFuture<Item=Self::SinkItem>,
Fut::Error: From<Self::SinkError>,
Self: Sized
Composes a function in front of the sink. Read more
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.
fn sink_from_err<E: From<Self::SinkError>>(self) -> SinkFromErr<Self, E> where Self: Sized
Map this sink's error to any error implementing From
for this sink's Error
, returning a new sink. Read more
fn buffer(self, amt: usize) -> Buffer<Self> where Self: Sized
Adds a fixed-size buffer to the current sink. Read more
fn flush(self) -> Flush<Self> where Self: Sized
A future that completes when the sink has finished processing all pending requests. Read more
fn send(self, item: Self::SinkItem) -> Send<Self> where Self: Sized
A future that completes after the given item has been fully processed into the sink, including flushing. Read more
fn send_all<S>(self, stream: S) -> SendAll<Self, S> where S: Stream<Item=Self::SinkItem>,
Self::SinkError: From<S::Error>,
Self: Sized
Self::SinkError: From<S::Error>,
Self: Sized
A future that completes after the given stream has been fully processed into the sink, including flushing. Read more
impl<S, F, B> Stream for FilterMap<S, F> where S: Stream,
F: FnMut(S::Item) -> Option<B>
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F: FnMut(S::Item) -> Option<B>
type Item = B
The type of item this stream will yield on success.
type Error = S::Error
The type of error this stream may generate.
fn poll(&mut self) -> Poll<Option<B>, S::Error>
Attempt to pull out the next value of this stream, returning None
if the stream is finished. Read more
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
fn boxed(self) -> BoxStream<Self::Item, Self::Error> where Self: Sized + Send + 'static
Convenience function for turning this stream into a trait object. Read more
fn into_future(self) -> StreamFuture<Self> where Self: Sized
Converts this stream into a Future
. Read more
fn map<U, F>(self, f: F) -> Map<Self, F> where F: FnMut(Self::Item) -> U, Self: Sized
Converts a stream of type T
to a stream of type U
. Read more
fn map_err<U, F>(self, f: F) -> MapErr<Self, F> where F: FnMut(Self::Error) -> U, Self: Sized
Converts a stream of error type T
to a stream of error type U
. Read more
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
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
fn then<F, U>(self, f: F) -> Then<Self, F, U> where F: FnMut(Result<Self::Item, Self::Error>) -> U,
U: IntoFuture,
Self: Sized
U: IntoFuture,
Self: Sized
Chain on a computation for when a value is ready, passing the resulting item to the provided closure f
. Read more
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
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 more
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 more
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
fn concat(self) -> Concat<Self> where Self: Sized, Self::Item: Extend<Self::Item::Item> + IntoIterator
Concatenate all results of a stream into a single extendable destination, returning a future representing the end result. Read more
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::Error>,
Self: Sized
Fut: IntoFuture<Item=T>,
Self::Error: From<Fut::Error>,
Self: Sized
Execute an accumulating computation over a stream, collecting all the values into one final result. Read more
fn flatten(self) -> Flatten<Self> where Self::Item: Stream, Self::Item::Error: From<Self::Error>, Self: Sized
Flattens a stream of streams into just one continuous stream. Read more
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
R: IntoFuture<Item=bool, Error=Self::Error>,
Self: Sized
Skip elements on this stream while the predicate provided resolves to true
. Read more
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
R: IntoFuture<Item=bool, Error=Self::Error>,
Self: Sized
Take elements from this stream while the predicate provided resolves to true
. Read more
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
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
fn from_err<E: From<Self::Error>>(self) -> FromErr<Self, E> where Self: Sized
Map this stream's error to any error implementing From
for this stream's Error
, returning a new stream. Read more
fn take(self, amt: u64) -> Take<Self> where Self: Sized
Creates a new stream of at most amt
items of the underlying stream. Read more
fn skip(self, amt: u64) -> Skip<Self> where Self: Sized
Creates a new stream which skips amt
items of the underlying stream. Read more
fn fuse(self) -> Fuse<Self> where Self: Sized
Fuse a stream such that poll
will never again be called once it has finished. Read more
fn catch_unwind(self) -> CatchUnwind<Self> where Self: Sized + UnwindSafe
Catches unwinding panics while polling the stream. Read more
fn buffered(self, amt: usize) -> Buffered<Self> where Self::Item: IntoFuture<Error=Self::Error>, Self: Sized
An adaptor for creating a buffered list of pending futures. Read more
fn buffer_unordered(self, amt: usize) -> BufferUnordered<Self> where Self::Item: IntoFuture<Error=Self::Error>, Self: Sized
An adaptor for creating a buffered list of pending futures (unordered). Read more
fn merge<S>(self, other: S) -> Merge<Self, S> where S: Stream<Error=Self::Error>, Self: Sized
An adapter for merging the output of two streams. Read more
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
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
fn peekable(self) -> Peekable<Self> where Self: Sized
Creates a new stream which exposes a peek
method. Read more
fn chunks(self, capacity: usize) -> Chunks<Self> where Self: Sized
An adaptor for chunking up items of the stream inside a vector. Read more
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
fn forward<S>(self, sink: S) -> Forward<Self, S> where S: Sink<SinkItem=Self::Item>,
Self::Error: From<S::SinkError>,
Self: Sized
Self::Error: From<S::SinkError>,
Self: Sized
A future that completes after the given stream has been fully processed into the sink, including flushing. Read more
fn split(self) -> (SplitSink<Self>, SplitStream<Self>) where Self: Sink + Sized
Splits this Stream + Sink
object into separate Stream
and Sink
objects. Read more