Struct futures::future::PollFn

#[must_use = "futures do nothing unless polled"]
pub struct PollFn<F> { /* fields omitted */ }

A future which adapts a function returning Poll.

Created by the poll_fn function.

Trait Implementations

impl<F> Debug for PollFn<F> where
    F: Debug, 

fn fmt(&self, __arg_0: &mut Formatter) -> Result<(), Error>

Formats the value using the given formatter.

impl<T, E, F> Future for PollFn<F> where
    F: FnMut(&mut Context) -> Result<Async<T>, E>, 

type Item = T

A successful value

type Error = E

An error

fn poll(&mut self, cx: &mut Context) -> Result<Async<T>, E>

Attempt to resolve the future to a final value, registering the current task for wakeup if the value is not yet available.