Struct tokio::prelude::future::Inspect

pub struct Inspect<A, F>where
    A: Future,{ /* private fields */ }

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

This is created by the Future::inspect method.

Trait Implementations

impl<A, F> Debug for Inspect<A, F>where
    A: Debug + Future,
    F: Debug,

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

Formats the value using the given formatter.

impl<A, F> Future for Inspect<A, F>where
    A: Future,
    F: FnOnce(&<A as Future>::Item),

type Item = <A as Future>::Item

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

type Error = <A as Future>::Error

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

fn poll(&mut self) -> Result<Async<<A as Future>::Item>, <A as Future>::Error>

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

fn wait(self) -> Result<Self::Item, Self::Error>where
    Self: Sized,

Block the current thread until this future is resolved.

fn map<F, U>(self, f: F) -> Map<Self, F>where
    F: FnOnce(Self::Item) -> U,
    Self: Sized,

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

fn map_err<F, E>(self, f: F) -> MapErr<Self, F>where
    F: FnOnce(Self::Error) -> E,
    Self: Sized,

Map this future’s error to a different error, returning a new future.

fn from_err<E>(self) -> FromErr<Self, E>where
    E: From<Self::Error>,
    Self: Sized,

Map this future’s error to any error implementing From for this future’s Error, returning a new future.

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

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

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,

Execute another future after this one has resolved successfully.

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,

Execute another future if this one resolves with an error.

fn select<B>(self, other: B) -> Select<Self, <B as IntoFuture>::Future>where
    B: IntoFuture<Item = Self::Item, Error = Self::Error>,
    Self: Sized,

Waits for either one of two futures to complete.

fn select2<B>(self, other: B) -> Select2<Self, <B as IntoFuture>::Future>where
    B: IntoFuture,
    Self: Sized,

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

fn join<B>(self, other: B) -> Join<Self, <B as IntoFuture>::Future>where
    B: IntoFuture<Error = Self::Error>,
    Self: Sized,

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

fn join3<B, C>(
    self,
    b: B,
    c: C
) -> Join3<Self, <B as IntoFuture>::Future, <C as IntoFuture>::Future>where
    B: IntoFuture<Error = Self::Error>,
    C: IntoFuture<Error = Self::Error>,
    Self: Sized,

Same as join, but with more futures.

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

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 as IntoFuture>::Future, <C as IntoFuture>::Future, <D as IntoFuture>::Future, <E as IntoFuture>::Future>where
    B: IntoFuture<Error = Self::Error>,
    C: IntoFuture<Error = Self::Error>,
    D: IntoFuture<Error = Self::Error>,
    E: IntoFuture<Error = Self::Error>,
    Self: Sized,

Same as join, but with more futures.

fn into_stream(self) -> IntoStream<Self>where
    Self: Sized,

Convert this future into a single element stream.

fn fuse(self) -> Fuse<Self>where
    Self: Sized,

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

fn inspect<F>(self, f: F) -> Inspect<Self, F>where
    F: FnOnce(&Self::Item),
    Self: Sized,

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

fn shared(self) -> Shared<Self>where
    Self: Sized,

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