Enum futures::Poll [−] [src]

pub enum Poll<T, E> {
    NotReady,
    Ok(T),
    Err(E),
}

Possible return values from the Future::poll method.

Variants

NotReady

Indicates that the future is not ready yet, ask again later.

Ok(T)

Indicates that the future has completed successfully, and this value is what the future completed with.

Err(E)

Indicates that the future has failed, and this error is what the future failed with.

Methods

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

Change the success type of this Poll value with the closure provided

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

Change the error type of this Poll value with the closure provided

fn is_not_ready(&self) -> bool

Returns whether this is Poll::NotReady

fn is_ready(&self) -> bool

Returns whether this is either Poll::Ok or Poll::Err

fn unwrap(self) -> Result<T, E>

Unwraps this Poll into a Result, panicking if it's not ready.

Trait Implementations

impl<T: PartialEq, E: PartialEq> PartialEq for Poll<T, E>
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fn eq(&self, __arg_0: &Poll<T, E>) -> bool

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

fn ne(&self, __arg_0: &Poll<T, E>) -> bool

This method tests for !=.

impl<T: Debug, E: Debug> Debug for Poll<T, E>
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fn fmt(&self, __arg_0: &mut Formatter) -> Result

Formats the value using the given formatter.

impl<T: Clone, E: Clone> Clone for Poll<T, E>
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fn clone(&self) -> Poll<T, E>

Returns a copy of the value. Read more

fn clone_from(&mut self, source: &Self)
1.0.0

Performs copy-assignment from source. Read more

impl<T: Copy, E: Copy> Copy for Poll<T, E>
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impl<T, E> From<Result<T, E>> for Poll<T, E>
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fn from(r: Result<T, E>) -> Poll<T, E>

Performs the conversion.