Enum futures_core::task::Poll

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#[must_use = "this `Poll` may be a `Pending` variant, which should be handled"]
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>[−]

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

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

futures in libcore are unstable

Changes the ready value of this Poll with the closure provided.

pub fn is_ready(&self) -> bool[−]

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

futures in libcore are unstable

Returns true if this is Poll::Ready

pub fn is_pending(&self) -> bool[−]

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

futures in libcore are unstable

Returns true if this is Poll::Pending

impl<T, E> Poll<Result<T, E>>[−]

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

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

futures in libcore are unstable

Changes 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, [−]

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

futures in libcore are unstable

Changes the error value of this Poll with the closure provided.

Trait Implementations

impl<T> Debug for Poll<T> where
    T: Debug, [+]

[+] Show hidden undocumented items

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

Formats the value using the given formatter.

impl<T> Clone for Poll<T> where
    T: Clone, [+]

[+] Show hidden undocumented items

fn clone(&self) -> Poll<T>[−]

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)[−]

Performs copy-assignment from source.

impl<T> PartialOrd<Poll<T>> for Poll<T> where
    T: PartialOrd<T>, [+]

[+] Show hidden undocumented items

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

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

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

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

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

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[−]

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

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

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, [+]

[+] Show hidden undocumented items

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

This method returns an Ordering between self and other.

fn max(self, other: Self) -> Self[−]

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Self[−]

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>, [+]

[+] Show hidden undocumented items

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

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

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

This method tests for !=.

impl<T> From<T> for Poll<T>[+]

[+] Show hidden undocumented items

fn from(t: T) -> Poll<T>[−]

Performs the conversion.

impl<T, E> Try for Poll<Result<T, E>>[+]

[+] Show hidden undocumented items

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>[−]

🔬 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>>[−]

🔬 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>>[−]

🔬 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<Option<Result<T, E>>>[+]

[+] Show hidden undocumented items

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>[−]

🔬 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>>>[−]

🔬 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>>>[−]

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

impl<T> Hash for Poll<T> where
    T: Hash, [+]

[+] Show hidden undocumented items

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

Feeds this value into the given [Hasher].

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

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