Enum Poll

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

An enum which indicates whether a value is ready or not.

Variants

Ready(T)

The task has just been finished with a returned value of T.

Pending

The task is not ready and should be scheduled to be awoken by the executor.

Implementations

impl<T> Poll<T>

pub fn is_pending(&self) -> bool

Return whether the value is Pending.

pub fn is_ready(&self) -> bool

Return whether the value is Ready.

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

where F: FnOnce(T) -> U,

Maps the value to a new type with given function.

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

pub fn is_ok(&self) -> bool

Return whether the value is Ready(Ok(t)).

pub fn is_err(&self) -> bool

Return whether the value is Ready(Err(t)).

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

where F: FnOnce(T) -> U,

Maps the value to a new type with given function if the value is Ok.

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

where F: FnOnce(E) -> U,

Maps the value to a new type with given function if the value is Err.

Trait Implementations

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

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

Returns a duplicate of the value.

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

Performs copy-assignment from source.

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

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

Formats the value using the given formatter.

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

fn from(v: Async<T>) -> Self

Converts to this type from the input type.

impl<T, E> From<Result<Async<T>, E>> for Poll<Result<T, E>>

fn from(v: Poll<T, E>) -> Self

Converts to this type from the input type.

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

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

Converts to this type from the input type.

impl<T> Into<Async<T>> for Poll<T>

fn into(self) -> Async<T>

Converts this type into the (usually inferred) input type.

impl<T, E> Into<Result<Async<T>, E>> for Poll<Result<T, E>>

fn into(self) -> Poll<T, E>

Converts this type into the (usually inferred) input type.

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

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

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

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

impl<T> StructuralPartialEq for Poll<T>