Struct futures::future::OrElse
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#[must_use = "futures do nothing unless polled"]pub struct OrElse<A, B, F> where
A: Future,
B: IntoFuture, { /* fields omitted */ }
Future for the or_else
combinator, chaining a computation onto the end of
a future which fails with an error.
This is created by the Future::or_else
method.
Trait Implementations
impl<A, B, F> Debug for OrElse<A, B, F> where
A: Debug + Future,
B: Debug + IntoFuture,
F: Debug,
<B as IntoFuture>::Future: Debug,
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A: Debug + Future,
B: Debug + IntoFuture,
F: Debug,
<B as IntoFuture>::Future: Debug,
fn fmt(&self, __arg_0: &mut Formatter) -> Result<(), Error>
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Formats the value using the given formatter. Read more
impl<A, B, F> Future for OrElse<A, B, F> where
A: Future,
B: IntoFuture<Item = <A as Future>::Item>,
F: FnOnce(<A as Future>::Error) -> B,
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A: Future,
B: IntoFuture<Item = <A as Future>::Item>,
F: FnOnce(<A as Future>::Error) -> B,
type Item = <B as IntoFuture>::Item
A successful value
type Error = <B as IntoFuture>::Error
An error
fn poll(
&mut self,
cx: &mut Context
) -> Result<Async<<B as IntoFuture>::Item>, <B as IntoFuture>::Error>
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&mut self,
cx: &mut Context
) -> Result<Async<<B as IntoFuture>::Item>, <B as IntoFuture>::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