Enum std::task::Poll

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

🔬 This is a nightly-only experimental API. (futures_api #50547)

futures in libcore are unstable

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 #50547)

futures in libcore are unstable

Represents that a value is immediately ready.

Pending

🔬 This is a nightly-only experimental API. (futures_api #50547)

futures in libcore are unstable

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 #50547)

futures in libcore are unstable

Change 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 #50547)

futures in libcore are unstable

Returns whether this is Poll::Ready

pub fn is_pending(&self) -> bool

🔬 This is a nightly-only experimental API. (futures_api #50547)

futures in libcore are unstable

Returns whether 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 #50547)

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,

🔬 This is a nightly-only experimental API. (futures_api #50547)

futures in libcore are unstable

Change the error value of this Poll with the closure provided

Trait Implementations

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

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

Formats the value using the given formatter.

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

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

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

Performs the conversion.

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

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>,

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,

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>,

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> Hash for Poll<T> where     T: Hash,

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].