Enum futures::task::Poll

[+] Show declaration

pub enum Poll<T> {
    Ready(T),
    Pending,
}

🔬 This is a nightly-only experimental API. (futures_api)

futures in libcore are unstable

[−] Expand description

Indicates whether a value is available or if the current task has been scheduled to receive a wakeup instead.

Variants

Ready(T)

🔬 This is a nightly-only experimental API. (futures_api)

futures in libcore are unstable

[−] Expand description

Represents that a value is immediately ready.

Pending

🔬 This is a nightly-only experimental API. (futures_api)

futures in libcore are unstable

[−] Expand description

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> Poll<T>

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pub fn map<U, F>(self, f: F) -> Poll<U> where     F: FnOnce(T) -> U,

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🔬 This is a nightly-only experimental API. (futures_api)

futures in libcore are unstable

Change the ready value of this Poll with the closure provided

pub fn is_ready(&self) -> bool

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🔬 This is a nightly-only experimental API. (futures_api)

futures in libcore are unstable

Returns whether this is Poll::Ready

pub fn is_pending(&self) -> bool

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🔬 This is a nightly-only experimental API. (futures_api)

futures in libcore are unstable

Returns whether this is Poll::Pending

impl<T, E> Poll<Result<T, E>>

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pub fn map_ok<U, F>(self, f: F) -> Poll<Result<U, E>> where     F: FnOnce(T) -> U,

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🔬 This is a nightly-only experimental API. (futures_api)

futures in libcore are unstable

Change the success value of this Poll with the closure provided

pub fn map_err<U, F>(self, f: F) -> Poll<Result<T, U>> where     F: FnOnce(E) -> U,

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🔬 This is a nightly-only experimental API. (futures_api)

futures in libcore are unstable

Change the error value of this Poll with the closure provided

Trait Implementations

impl<T> Clone for Poll<T> where     T: Clone,

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fn clone(&self) -> Poll<T>

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Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

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Performs copy-assignment from source.

impl<T> PartialOrd<Poll<T>> for Poll<T> where     T: PartialOrd<T>,

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fn partial_cmp(&self, other: &Poll<T>) -> Option<Ordering>

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This method returns an ordering between self and other values if one exists.

fn lt(&self, other: &Poll<T>) -> bool

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This method tests less than (for self and other) and is used by the < operator.

fn le(&self, other: &Poll<T>) -> bool

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This method tests less than or equal to (for self and other) and is used by the <= operator.

fn gt(&self, other: &Poll<T>) -> bool

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This method tests greater than (for self and other) and is used by the > operator.

fn ge(&self, other: &Poll<T>) -> bool

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This method tests greater than or equal to (for self and other) and is used by the >= operator.

impl<T> Ord for Poll<T> where     T: Ord,

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fn cmp(&self, other: &Poll<T>) -> Ordering

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This method returns an Ordering between self and other.

fn max(self, other: Self) -> Self

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Compares and returns the maximum of two values.

fn min(self, other: Self) -> Self

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Compares and returns the minimum of two values.

impl<T> Eq for Poll<T> where     T: Eq,

impl<T> PartialEq<Poll<T>> for Poll<T> where     T: PartialEq<T>,

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fn eq(&self, other: &Poll<T>) -> bool

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This method tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Poll<T>) -> bool

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This method tests for !=.

impl<T> From<T> for Poll<T>

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fn from(t: T) -> Poll<T>

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Performs the conversion.

impl<T> Copy for Poll<T> where     T: Copy,

impl<T> Hash for Poll<T> where     T: Hash,

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fn hash<__HT>(&self, state: &mut __HT) where     __HT: Hasher,

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Feeds this value into the given [Hasher].

fn hash_slice<H>(data: &[Self], state: &mut H) where     H: Hasher,

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Feeds a slice of this type into the given [Hasher].

impl<T, E> Try for Poll<Option<Result<T, E>>>

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type Ok = Poll<Option<T>>

🔬 This is a nightly-only experimental API. (try_trait)

The type of this value when viewed as successful.

type Error = E

🔬 This is a nightly-only experimental API. (try_trait)

The type of this value when viewed as failed.

fn into_result(     self ) -> Result<<Poll<Option<Result<T, E>>> as Try>::Ok, <Poll<Option<Result<T, E>>> as Try>::Error>

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🔬 This is a nightly-only experimental API. (try_trait)

Applies the "?" operator. A return of Ok(t) means that the execution should continue normally, and the result of ? is the value t. A return of Err(e) means that execution should branch to the innermost enclosing catch, or return from the function.

fn from_error(     e: <Poll<Option<Result<T, E>>> as Try>::Error ) -> Poll<Option<Result<T, E>>>

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🔬 This is a nightly-only experimental API. (try_trait)

Wrap an error value to construct the composite result. For example, Result::Err(x) and Result::from_error(x) are equivalent.

fn from_ok(     x: <Poll<Option<Result<T, E>>> as Try>::Ok ) -> Poll<Option<Result<T, E>>>

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🔬 This is a nightly-only experimental API. (try_trait)

Wrap an OK value to construct the composite result. For example, Result::Ok(x) and Result::from_ok(x) are equivalent.

impl<T, E> Try for Poll<Result<T, E>>

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type Ok = Poll<T>

🔬 This is a nightly-only experimental API. (try_trait)

The type of this value when viewed as successful.

type Error = E

🔬 This is a nightly-only experimental API. (try_trait)

The type of this value when viewed as failed.

fn into_result(     self ) -> Result<<Poll<Result<T, E>> as Try>::Ok, <Poll<Result<T, E>> as Try>::Error>

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🔬 This is a nightly-only experimental API. (try_trait)

Applies the "?" operator. A return of Ok(t) means that the execution should continue normally, and the result of ? is the value t. A return of Err(e) means that execution should branch to the innermost enclosing catch, or return from the function.

fn from_error(e: <Poll<Result<T, E>> as Try>::Error) -> Poll<Result<T, E>>

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🔬 This is a nightly-only experimental API. (try_trait)

Wrap an error value to construct the composite result. For example, Result::Err(x) and Result::from_error(x) are equivalent.

fn from_ok(x: <Poll<Result<T, E>> as Try>::Ok) -> Poll<Result<T, E>>

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🔬 This is a nightly-only experimental API. (try_trait)

Wrap an OK value to construct the composite result. For example, Result::Ok(x) and Result::from_ok(x) are equivalent.

impl<T> Debug for Poll<T> where     T: Debug,

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fn fmt(&self, f: &mut Formatter) -> Result<(), Error>

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Formats the value using the given formatter.