Struct futures_util::future::UnwrapOrElse

source · 
pub struct UnwrapOrElse<Fut, F> { /* private fields */ }
Expand description

Future for the unwrap_or_else method.

Trait Implementations§

source§

impl<Fut, F> Debug for UnwrapOrElse<Fut, F>where Map<IntoFuture<Fut>, UnwrapOrElseFn<F>>: Debug,

source§

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

Formats the value using the given formatter. Read more
source§

impl<Fut, F> FusedFuture for UnwrapOrElse<Fut, F>where Map<IntoFuture<Fut>, UnwrapOrElseFn<F>>: FusedFuture,

source§

fn is_terminated(&self) -> bool

Returns true if the underlying future should no longer be polled.
source§

impl<Fut, F> Future for UnwrapOrElse<Fut, F>where Map<IntoFuture<Fut>, UnwrapOrElseFn<F>>: Future,

§

type Output = <Map<IntoFuture<Fut>, UnwrapOrElseFn<F>> as Future>::Output

The type of value produced on completion.
source§

fn poll(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output>

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

impl<'__pin, Fut, F> Unpin for UnwrapOrElse<Fut, F>where __Origin<'__pin, Fut, F>: Unpin,

Auto Trait Implementations§

§

impl<Fut, F> RefUnwindSafe for UnwrapOrElse<Fut, F>where F: RefUnwindSafe, Fut: RefUnwindSafe,

§

impl<Fut, F> Send for UnwrapOrElse<Fut, F>where F: Send, Fut: Send,

§

impl<Fut, F> Sync for UnwrapOrElse<Fut, F>where F: Sync, Fut: Sync,

§

impl<Fut, F> UnwindSafe for UnwrapOrElse<Fut, F>where F: UnwindSafe, Fut: UnwindSafe,

Blanket Implementations§

source§

impl<T> Any for Twhere T: 'static + ?Sized,

source§

fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
source§

impl<T> Borrow<T> for Twhere T: ?Sized,

source§

fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
source§

impl<T> BorrowMut<T> for Twhere T: ?Sized,

source§

fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
source§

impl<T> From<T> for T

source§

fn from(t: T) -> T

Returns the argument unchanged.

source§

impl<T> FutureExt for Twhere T: Future + ?Sized,

source§

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

Map this future’s output to a different type, returning a new future of the resulting type. Read more
source§

fn map_into<U>(self) -> MapInto<Self, U> ⓘwhere Self::Output: Into<U>, Self: Sized,

Map this future’s output to a different type, returning a new future of the resulting type. Read more
source§

fn then<Fut, F>(self, f: F) -> Then<Self, Fut, F> ⓘwhere F: FnOnce(Self::Output) -> Fut, Fut: Future, Self: Sized,

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

fn left_future<B>(self) -> Either<Self, B> ⓘwhere B: Future<Output = Self::Output>, Self: Sized,

Wrap this future in an Either future, making it the left-hand variant of that Either. Read more
source§

fn right_future<A>(self) -> Either<A, Self> ⓘwhere A: Future<Output = Self::Output>, Self: Sized,

Wrap this future in an Either future, making it the right-hand variant of that Either. Read more
source§

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

Convert this future into a single element stream. Read more
source§

fn flatten(self) -> Flatten<Self> ⓘwhere Self::Output: Future, Self: Sized,

Flatten the execution of this future when the output of this future is itself another future. Read more
source§

fn flatten_stream(self) -> FlattenStream<Self>where Self::Output: Stream, Self: Sized,

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

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

Fuse a future such that poll will never again be called once it has completed. This method can be used to turn any Future into a FusedFuture. Read more
source§

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

Do something with the output of a future before passing it on. Read more
source§

fn catch_unwind(self) -> CatchUnwind<Self> ⓘwhere Self: Sized + UnwindSafe,

Catches unwinding panics while polling the future. Read more
source§

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

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

fn boxed<'a>(self) -> BoxFuture<'a, Self::Output>where Self: Sized + Send + 'a,

Wrap the future in a Box, pinning it. Read more
source§

fn boxed_local<'a>(self) -> LocalBoxFuture<'a, Self::Output>where Self: Sized + 'a,

Wrap the future in a Box, pinning it. Read more
source§

fn unit_error(self) -> UnitError<Self> ⓘwhere Self: Sized,

Turns a Future<Output = T> into a TryFuture<Ok = T, Error = ()>.
source§

fn never_error(self) -> NeverError<Self> ⓘwhere Self: Sized,

Turns a Future<Output = T> into a TryFuture<Ok = T, Error = Never>.
source§

fn poll_unpin(&mut self, cx: &mut Context<'_>) -> Poll<Self::Output>where Self: Unpin,

A convenience for calling Future::poll on Unpin future types.
source§

fn now_or_never(self) -> Option<Self::Output>where Self: Sized,

Evaluates and consumes the future, returning the resulting output if the future is ready after the first call to Future::poll. Read more
source§

impl<T, U> Into<U> for Twhere U: From<T>,

source§

fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

source§

impl<F> IntoFuture for Fwhere F: Future,

§

type Output = <F as Future>::Output

The output that the future will produce on completion.
§

type IntoFuture = F

Which kind of future are we turning this into?
source§

fn into_future(self) -> <F as IntoFuture>::IntoFuture

Creates a future from a value. Read more
source§

impl<T, U> TryFrom<U> for Twhere U: Into<T>,

§

type Error = Infallible

The type returned in the event of a conversion error.
source§

fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
source§

impl<F, T, E> TryFuture for Fwhere F: Future<Output = Result<T, E>> + ?Sized,

§

type Ok = T

The type of successful values yielded by this future
§

type Error = E

The type of failures yielded by this future
source§

fn try_poll( self: Pin<&mut F>, cx: &mut Context<'_> ) -> Poll<<F as Future>::Output>

Poll this TryFuture as if it were a Future. Read more
source§

impl<Fut> TryFutureExt for Futwhere Fut: TryFuture + ?Sized,

source§

fn map_ok<T, F>(self, f: F) -> MapOk<Self, F> ⓘwhere F: FnOnce(Self::Ok) -> T, Self: Sized,

Maps this future’s success value to a different value. Read more
source§

fn map_ok_or_else<T, E, F>(self, e: E, f: F) -> MapOkOrElse<Self, F, E> ⓘwhere F: FnOnce(Self::Ok) -> T, E: FnOnce(Self::Error) -> T, Self: Sized,

Maps this future’s success value to a different value, and permits for error handling resulting in the same type. Read more
source§

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

Maps this future’s error value to a different value. Read more
source§

fn err_into<E>(self) -> ErrInto<Self, E> ⓘwhere Self: Sized, Self::Error: Into<E>,

Maps this future’s Error to a new error type using the Into trait. Read more
source§

fn ok_into<U>(self) -> OkInto<Self, U> ⓘwhere Self: Sized, Self::Ok: Into<U>,

Maps this future’s Ok to a new type using the Into trait.
source§

fn and_then<Fut, F>(self, f: F) -> AndThen<Self, Fut, F> ⓘwhere F: FnOnce(Self::Ok) -> Fut, Fut: TryFuture<Error = Self::Error>, Self: Sized,

Executes another future after this one resolves successfully. The success value is passed to a closure to create this subsequent future. Read more
source§

fn or_else<Fut, F>(self, f: F) -> OrElse<Self, Fut, F> ⓘwhere F: FnOnce(Self::Error) -> Fut, Fut: TryFuture<Ok = Self::Ok>, Self: Sized,

Executes another future if this one resolves to an error. The error value is passed to a closure to create this subsequent future. Read more
source§

fn inspect_ok<F>(self, f: F) -> InspectOk<Self, F> ⓘwhere F: FnOnce(&Self::Ok), Self: Sized,

Do something with the success value of a future before passing it on. Read more
source§

fn inspect_err<F>(self, f: F) -> InspectErr<Self, F> ⓘwhere F: FnOnce(&Self::Error), Self: Sized,

Do something with the error value of a future before passing it on. Read more
source§

fn try_flatten(self) -> TryFlatten<Self, Self::Ok> ⓘwhere Self::Ok: TryFuture<Error = Self::Error>, Self: Sized,

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

fn try_flatten_stream(self) -> TryFlattenStream<Self>where Self::Ok: TryStream<Error = Self::Error>, Self: Sized,

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

fn unwrap_or_else<F>(self, f: F) -> UnwrapOrElse<Self, F> ⓘwhere Self: Sized, F: FnOnce(Self::Error) -> Self::Ok,

Unwraps this future’s output, producing a future with this future’s Ok type as its Output type. Read more
source§

fn into_future(self) -> IntoFuture<Self> ⓘwhere Self: Sized,

Wraps a TryFuture into a type that implements Future. Read more
source§

fn try_poll_unpin( &mut self, cx: &mut Context<'_> ) -> Poll<Result<Self::Ok, Self::Error>>where Self: Unpin,

A convenience method for calling TryFuture::try_poll on Unpin future types.
source§

impl<T, U> TryInto<U> for Twhere U: TryFrom<T>,

§

type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
source§

fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.