Struct futures_util::future::Map

#[must_use = "futures do nothing unless polled"]
pub struct Map<A, F> where
    A: Future,  { /* fields omitted */ }

Future for the map combinator, changing the type of a future.

This is created by the Future::map method.

Trait Implementations

impl<A: Debug, F: Debug> Debug for Map<A, F> where
    A: Future, 

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

Formats the value using the given formatter.

impl<U, A, F> Future for Map<A, F> where
    A: Future,
    F: FnOnce(A::Item) -> U, 

type Item = U

A successful value

type Error = A::Error

An error

fn poll(&mut self, cx: &mut Context) -> Poll<U, A::Error>

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