Enum futures::prelude::Async
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pub enum Async<T> { Ready(T), Pending, }
Indicates whether a value is available, or if the current task has been scheduled for later wake-up instead.
Variants
Ready(T)
Represents that a value is immediately ready.
Pending
Represents that a value is not ready yet.
When a function returns Pending
, the function must also
ensure that the current task is scheduled to be awoken when
progress can be made.
Methods
impl<T> Async<T>
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pub fn map<U, F>(self, f: F) -> Async<U> where
F: FnOnce(T) -> U,
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F: FnOnce(T) -> U,
Change the success value of this Async
with the closure provided
pub fn is_ready(&self) -> bool
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Returns whether this is Async::Ready
pub fn is_pending(&self) -> bool
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Returns whether this is Async::Pending
Trait Implementations
impl<T> From<T> for Async<T>
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impl<T> PartialEq<Async<T>> for Async<T> where
T: PartialEq<T>,
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T: PartialEq<T>,
fn eq(&self, __arg_0: &Async<T>) -> bool
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This method tests for self
and other
values to be equal, and is used by ==
. Read more
fn ne(&self, __arg_0: &Async<T>) -> bool
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This method tests for !=
.
impl<T> Copy for Async<T> where
T: Copy,
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T: Copy,
impl<T> Debug for Async<T> where
T: Debug,
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T: Debug,
fn fmt(&self, __arg_0: &mut Formatter) -> Result<(), Error>
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Formats the value using the given formatter. Read more
impl<T> Clone for Async<T> where
T: Clone,
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T: Clone,