Struct futures::future::Join4
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#[must_use = "futures do nothing unless polled"]pub struct Join4<A, B, C, D> where
A: Future,
B: Future<Error = <A as Future>::Error>,
C: Future<Error = <A as Future>::Error>,
D: Future<Error = <A as Future>::Error>, { /* fields omitted */ }
Future for the join4
combinator, waiting for four futures to
complete.
This is created by the Future::join4
method.
Trait Implementations
impl<A, B, C, D> Debug for Join4<A, B, C, D> where
A: Future + Debug,
B: Future<Error = <A as Future>::Error> + Debug,
C: Future<Error = <A as Future>::Error> + Debug,
D: Future<Error = <A as Future>::Error> + Debug,
<A as Future>::Item: Debug,
<B as Future>::Item: Debug,
<C as Future>::Item: Debug,
<D as Future>::Item: Debug,
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A: Future + Debug,
B: Future<Error = <A as Future>::Error> + Debug,
C: Future<Error = <A as Future>::Error> + Debug,
D: Future<Error = <A as Future>::Error> + Debug,
<A as Future>::Item: Debug,
<B as Future>::Item: Debug,
<C as Future>::Item: Debug,
<D as Future>::Item: Debug,
fn fmt(&self, fmt: &mut Formatter) -> Result<(), Error>
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Formats the value using the given formatter. Read more
impl<A, B, C, D> Future for Join4<A, B, C, D> where
A: Future,
B: Future<Error = <A as Future>::Error>,
C: Future<Error = <A as Future>::Error>,
D: Future<Error = <A as Future>::Error>,
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A: Future,
B: Future<Error = <A as Future>::Error>,
C: Future<Error = <A as Future>::Error>,
D: Future<Error = <A as Future>::Error>,
type Item = (<A as Future>::Item, <B as Future>::Item, <C as Future>::Item, <D as Future>::Item)
A successful value
type Error = <A as Future>::Error
An error
fn poll(
&mut self,
cx: &mut Context
) -> Result<Async<<Join4<A, B, C, D> as Future>::Item>, <Join4<A, B, C, D> as Future>::Error>
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&mut self,
cx: &mut Context
) -> Result<Async<<Join4<A, B, C, D> as Future>::Item>, <Join4<A, B, C, D> as Future>::Error>
Attempt to resolve the future to a final value, registering the current task for wakeup if the value is not yet available. Read more
Auto Trait Implementations
impl<A, B, C, D> Send for Join4<A, B, C, D> where
A: Send,
B: Send,
C: Send,
D: Send,
<A as Future>::Item: Send,
<B as Future>::Item: Send,
<C as Future>::Item: Send,
<D as Future>::Item: Send,
A: Send,
B: Send,
C: Send,
D: Send,
<A as Future>::Item: Send,
<B as Future>::Item: Send,
<C as Future>::Item: Send,
<D as Future>::Item: Send,
impl<A, B, C, D> Sync for Join4<A, B, C, D> where
A: Sync,
B: Sync,
C: Sync,
D: Sync,
<A as Future>::Item: Sync,
<B as Future>::Item: Sync,
<C as Future>::Item: Sync,
<D as Future>::Item: Sync,
A: Sync,
B: Sync,
C: Sync,
D: Sync,
<A as Future>::Item: Sync,
<B as Future>::Item: Sync,
<C as Future>::Item: Sync,
<D as Future>::Item: Sync,