pub enum Either<A, B> {
A(A),
B(B),
}
Expand description
Combines two different futures yielding the same item and error types into a single type.
Variants
A(A)
First branch of the type
B(B)
Second branch of the type
Implementations
Trait Implementations
sourceimpl<A, B> Future for Either<A, B>where
A: Future,
B: Future<Item = <A as Future>::Item, Error = <A as Future>::Error>,
impl<A, B> Future for Either<A, B>where
A: Future,
B: Future<Item = <A as Future>::Item, Error = <A as Future>::Error>,
type Item = <A as Future>::Item
type Item = <A as Future>::Item
The type of value that this future will resolved with if it is
successful. Read more
type Error = <A as Future>::Error
type Error = <A as Future>::Error
The type of error that this future will resolve with if it fails in a
normal fashion. Read more
sourcefn poll(&mut self) -> Result<Async<<A as Future>::Item>, <A as Future>::Error>
fn poll(&mut self) -> Result<Async<<A as Future>::Item>, <A as Future>::Error>
Query this future to see if its value has become available, registering
interest if it is not. Read more
sourcefn wait(self) -> Result<Self::Item, Self::Error>where
Self: Sized,
fn wait(self) -> Result<Self::Item, Self::Error>where
Self: Sized,
Block the current thread until this future is resolved. Read more
sourcefn map<F, U>(self, f: F) -> Map<Self, F>where
F: FnOnce(Self::Item) -> U,
Self: Sized,
fn map<F, U>(self, f: F) -> Map<Self, F>where
F: FnOnce(Self::Item) -> U,
Self: Sized,
Map this future’s result to a different type, returning a new future of
the resulting type. Read more
sourcefn map_err<F, E>(self, f: F) -> MapErr<Self, F>where
F: FnOnce(Self::Error) -> E,
Self: Sized,
fn map_err<F, E>(self, f: F) -> MapErr<Self, F>where
F: FnOnce(Self::Error) -> E,
Self: Sized,
Map this future’s error to a different error, returning a new future. Read more
sourcefn 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 future’s error to any error implementing
From
for
this future’s Error
, returning a new future. Read moresourcefn then<F, B>(self, f: F) -> Then<Self, B, F>where
F: FnOnce(Result<Self::Item, Self::Error>) -> B,
B: IntoFuture,
Self: Sized,
fn then<F, B>(self, f: F) -> Then<Self, B, F>where
F: FnOnce(Result<Self::Item, Self::Error>) -> B,
B: IntoFuture,
Self: Sized,
Chain on a computation for when a future finished, passing the result of
the future to the provided closure
f
. Read moresourcefn and_then<F, B>(self, f: F) -> AndThen<Self, B, F>where
F: FnOnce(Self::Item) -> B,
B: IntoFuture<Error = Self::Error>,
Self: Sized,
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,
Execute another future after this one has resolved successfully. Read more
sourcefn or_else<F, B>(self, f: F) -> OrElse<Self, B, F>where
F: FnOnce(Self::Error) -> B,
B: IntoFuture<Item = Self::Item>,
Self: Sized,
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,
Execute another future if this one resolves with an error. Read more
sourcefn select<B>(self, other: B) -> Select<Self, <B as IntoFuture>::Future>where
B: IntoFuture<Item = Self::Item, Error = Self::Error>,
Self: Sized,
fn select<B>(self, other: B) -> Select<Self, <B as IntoFuture>::Future>where
B: IntoFuture<Item = Self::Item, Error = Self::Error>,
Self: Sized,
Waits for either one of two futures to complete. Read more
sourcefn select2<B>(self, other: B) -> Select2<Self, <B as IntoFuture>::Future>where
B: IntoFuture,
Self: Sized,
fn select2<B>(self, other: B) -> Select2<Self, <B as IntoFuture>::Future>where
B: IntoFuture,
Self: Sized,
Waits for either one of two differently-typed futures to complete. Read more
sourcefn join<B>(self, other: B) -> Join<Self, <B as IntoFuture>::Future>where
B: IntoFuture<Error = Self::Error>,
Self: Sized,
fn join<B>(self, other: B) -> Join<Self, <B as IntoFuture>::Future>where
B: IntoFuture<Error = Self::Error>,
Self: Sized,
Joins the result of two futures, waiting for them both to complete. Read more
sourcefn join3<B, C>(
self,
b: B,
c: C
) -> Join3<Self, <B as IntoFuture>::Future, <C as IntoFuture>::Future>where
B: IntoFuture<Error = Self::Error>,
C: IntoFuture<Error = Self::Error>,
Self: Sized,
fn join3<B, C>(
self,
b: B,
c: C
) -> Join3<Self, <B as IntoFuture>::Future, <C as IntoFuture>::Future>where
B: IntoFuture<Error = Self::Error>,
C: IntoFuture<Error = Self::Error>,
Self: Sized,
Same as
join
, but with more futures.sourcefn join4<B, C, D>(
self,
b: B,
c: C,
d: D
) -> Join4<Self, <B as IntoFuture>::Future, <C as IntoFuture>::Future, <D as IntoFuture>::Future>where
B: IntoFuture<Error = Self::Error>,
C: IntoFuture<Error = Self::Error>,
D: IntoFuture<Error = Self::Error>,
Self: Sized,
fn join4<B, C, D>(
self,
b: B,
c: C,
d: D
) -> Join4<Self, <B as IntoFuture>::Future, <C as IntoFuture>::Future, <D as IntoFuture>::Future>where
B: IntoFuture<Error = Self::Error>,
C: IntoFuture<Error = Self::Error>,
D: IntoFuture<Error = Self::Error>,
Self: Sized,
Same as
join
, but with more futures.sourcefn join5<B, C, D, E>(
self,
b: B,
c: C,
d: D,
e: E
) -> Join5<Self, <B as IntoFuture>::Future, <C as IntoFuture>::Future, <D as IntoFuture>::Future, <E as IntoFuture>::Future>where
B: IntoFuture<Error = Self::Error>,
C: IntoFuture<Error = Self::Error>,
D: IntoFuture<Error = Self::Error>,
E: IntoFuture<Error = Self::Error>,
Self: Sized,
fn join5<B, C, D, E>(
self,
b: B,
c: C,
d: D,
e: E
) -> Join5<Self, <B as IntoFuture>::Future, <C as IntoFuture>::Future, <D as IntoFuture>::Future, <E as IntoFuture>::Future>where
B: IntoFuture<Error = Self::Error>,
C: IntoFuture<Error = Self::Error>,
D: IntoFuture<Error = Self::Error>,
E: IntoFuture<Error = Self::Error>,
Self: Sized,
Same as
join
, but with more futures.sourcefn into_stream(self) -> IntoStream<Self>where
Self: Sized,
fn into_stream(self) -> IntoStream<Self>where
Self: Sized,
Convert this future into a single element stream. Read more
sourcefn fuse(self) -> Fuse<Self>where
Self: Sized,
fn fuse(self) -> Fuse<Self>where
Self: Sized,
Fuse a future such that
poll
will never again be called once it has
completed. Read moresourcefn inspect<F>(self, f: F) -> Inspect<Self, F>where
F: FnOnce(&Self::Item),
Self: Sized,
fn inspect<F>(self, f: F) -> Inspect<Self, F>where
F: FnOnce(&Self::Item),
Self: Sized,
Do something with the item of a future, passing it on. Read more
Create a cloneable handle to this future where all handles will resolve
to the same result. Read more
sourceimpl<A, B> Stream for Either<A, B>where
A: Stream,
B: Stream<Item = <A as Stream>::Item, Error = <A as Stream>::Error>,
impl<A, B> Stream for Either<A, B>where
A: Stream,
B: Stream<Item = <A as Stream>::Item, Error = <A as Stream>::Error>,
sourcefn poll(
&mut self
) -> Result<Async<Option<<A as Stream>::Item>>, <A as Stream>::Error>
fn poll(
&mut self
) -> Result<Async<Option<<A as Stream>::Item>>, <A as Stream>::Error>
Attempt to pull out the next value of this stream, returning
None
if
the stream is finished. Read moresourcefn 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
sourcefn into_future(self) -> StreamFuture<Self>where
Self: Sized,
fn into_future(self) -> StreamFuture<Self>where
Self: Sized,
Converts this stream into a
Future
. Read moresourcefn 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
sourcefn 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
sourcefn 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 moresourcefn 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 moresourcefn 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 moresourcefn 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
sourcefn 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
sourcefn 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 moresourcefn 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 moresourcefn 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
sourcefn 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 moresourcefn 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 moresourcefn 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 moresourcefn 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 moresourcefn 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
sourcefn 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
sourcefn 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
sourcefn 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
sourcefn 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 moresourcefn 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
sourcefn 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
sourcefn 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
sourcefn 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
sourcefn 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
Auto Trait Implementations
impl<A, B> RefUnwindSafe for Either<A, B>where
A: RefUnwindSafe,
B: RefUnwindSafe,
impl<A, B> Send for Either<A, B>where
A: Send,
B: Send,
impl<A, B> Sync for Either<A, B>where
A: Sync,
B: Sync,
impl<A, B> Unpin for Either<A, B>where
A: Unpin,
B: Unpin,
impl<A, B> UnwindSafe for Either<A, B>where
A: UnwindSafe,
B: UnwindSafe,
Blanket Implementations
sourceimpl<T> BorrowMut<T> for Twhere
T: ?Sized,
impl<T> BorrowMut<T> for Twhere
T: ?Sized,
const: unstable · sourcefn borrow_mut(&mut self) -> &mut T
fn borrow_mut(&mut self) -> &mut T
Mutably borrows from an owned value. Read more