# Struct futures::future::PollFn [−] [src]

    #[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> Debug for PollFn<F>`
[src]

#### `fn fmt(&self, __arg_0: &mut Formatter) -> Result`
[src]

Formats the value using the given formatter. Read more

### `impl<T, E, F> Future for PollFn<F> where
F: FnMut() -> Poll<T, E>,`
[src]

#### `type Item = T`

The type of value that this future will resolved with if it is successful. Read more

#### `type Error = E`

The type of error that this future will resolve with if it fails in a normal fashion. Read more

#### `fn poll(&mut self) -> Poll<T, E>`
[src]

Query this future to see if its value has become available, registering interest if it is not. Read more

#### `fn wait(self) -> Result<Self::Item, Self::Error> where
Self: Sized,`
[src]

Block the current thread until this future is resolved. Read more

#### `fn map<F, U>(self, f: F) -> Map<Self, F> where
F: FnOnce(Self::Item) -> U,
Self: Sized,`
[src]

Map this future's result to a different type, returning a new future of the resulting type. Read more

#### `fn map_err<F, E>(self, f: F) -> MapErr<Self, F> where
F: FnOnce(Self::Error) -> E,
Self: Sized,`
[src]

Map this future's error to a different error, returning a new future. Read more

#### `fn from_err<E: From<Self::Error>>(self) -> FromErr<Self, E> where
Self: Sized,`
[src]

Map this future's error to any error implementing `From` for this future's `Error`, returning a new future. Read more

#### `fn then<F, B>(self, f: F) -> Then<Self, B, F> where
F: FnOnce(Result<Self::Item, Self::Error>) -> B,
B: IntoFuture,
Self: Sized,`
[src]

Chain on a computation for when a future finished, passing the result of the future to the provided closure `f`. Read more

#### `fn and_then<F, B>(self, f: F) -> AndThen<Self, B, F> where
F: FnOnce(Self::Item) -> B,
B: IntoFuture<Error = Self::Error>,
Self: Sized,`
[src]

Execute another future after this one has resolved successfully. Read more

#### `fn or_else<F, B>(self, f: F) -> OrElse<Self, B, F> where
F: FnOnce(Self::Error) -> B,
B: IntoFuture<Item = Self::Item>,
Self: Sized,`
[src]

Execute another future if this one resolves with an error. Read more

#### `fn select<B>(self, other: B) -> Select<Self, B::Future> where
B: IntoFuture<Item = Self::Item, Error = Self::Error>,
Self: Sized,`
[src]

Waits for either one of two futures to complete. Read more

#### `fn select2<B>(self, other: B) -> Select2<Self, B::Future> where
B: IntoFuture,
Self: Sized,`
[src]

Waits for either one of two differently-typed futures to complete. Read more

#### `fn join<B>(self, other: B) -> Join<Self, B::Future> where
B: IntoFuture<Error = Self::Error>,
Self: Sized,`
[src]

Joins the result of two futures, waiting for them both to complete. Read more

#### `fn join3<B, C>(self, b: B, c: C) -> Join3<Self, B::Future, C::Future> where
B: IntoFuture<Error = Self::Error>,
C: IntoFuture<Error = Self::Error>,
Self: Sized,`
[src]

Same as `join`, but with more futures.

#### `fn join4<B, C, D>(
self,
b: B,
c: C,
d: D
) -> Join4<Self, B::Future, C::Future, D::Future> where
B: IntoFuture<Error = Self::Error>,
C: IntoFuture<Error = Self::Error>,
D: IntoFuture<Error = Self::Error>,
Self: Sized,`
[src]

Same as `join`, but with more futures.

#### `fn join5<B, C, D, E>(
self,
b: B,
c: C,
d: D,
e: E
) -> Join5<Self, B::Future, C::Future, D::Future, E::Future> where
B: IntoFuture<Error = Self::Error>,
C: IntoFuture<Error = Self::Error>,
D: IntoFuture<Error = Self::Error>,
E: IntoFuture<Error = Self::Error>,
Self: Sized,`
[src]

Same as `join`, but with more futures.

#### `fn into_stream(self) -> IntoStream<Self> where
Self: Sized,`
[src]

Convert this future into a single element stream. Read more

#### `fn flatten(self) -> Flatten<Self> where
Self::Item: IntoFuture,
<Self::Item as IntoFuture>::Error: From<Self::Error>,
Self: Sized,`
[src]

Flatten the execution of this future when the successful result of this future is itself another future. Read more

#### `fn flatten_stream(self) -> FlattenStream<Self> where
Self::Item: Stream<Error = Self::Error>,
Self: Sized,`
[src]

Flatten the execution of this future when the successful result of this future is a stream. Read more

#### `fn fuse(self) -> Fuse<Self> where
Self: Sized,`
[src]

Fuse a future such that `poll` will never again be called once it has completed. Read more

#### `fn inspect<F>(self, f: F) -> Inspect<Self, F> where
F: FnOnce(&Self::Item),
Self: Sized,`
[src]

Do something with the item of a future, passing it on. Read more

#### `fn catch_unwind(self) -> CatchUnwind<Self> where
Self: Sized + UnwindSafe,`
[src]

Catches unwinding panics while polling the future. Read more

#### `fn shared(self) -> Shared<Self> where
Self: Sized,`
[src]

Create a cloneable handle to this future where all handles will resolve to the same result. Read more

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