[−][src]Struct futures::future::FutureObj

[+] Show declaration

pub struct FutureObj<'a, T>(_);

🔬 This is a nightly-only experimental API. (futures_api)

futures in libcore are unstable

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A custom trait object for polling futures, roughly akin to Box<dyn Future<Output = T> + Send + 'a>.

This custom trait object was introduced for two reasons:

Currently it is not possible to take dyn Trait by value and Box<dyn Trait> is not available in no_std contexts.
The Future trait is currently not object safe: The Future::poll method makes uses the arbitrary self types feature and traits in which this feature is used are currently not object safe due to current compiler limitations. (See tracking issue for arbitrary self types for more information #44874)

Methods

`impl<'a, T> FutureObj<'a, T>`
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`pub fn new<F>(f: F) -> FutureObj<'a, T> where F: Send + UnsafeFutureObj<'a, T>,`
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🔬 This is a nightly-only experimental API. (futures_api)

futures in libcore are unstable

Create a FutureObj from a custom trait object representation.

Trait Implementations

`impl<'a, T> Future for FutureObj<'a, T>`
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`type Output = T`

🔬 This is a nightly-only experimental API. (futures_api)

futures in libcore are unstable

The result of the Future.

`fn poll(self: PinMut<FutureObj<'a, T>>, cx: &mut Context) -> Poll<T>`
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🔬 This is a nightly-only experimental API. (futures_api)

futures in libcore are unstable

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

`impl<'a, T> From<FutureObj<'a, T>> for LocalFutureObj<'a, T>`
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`fn from(f: FutureObj<'a, T>) -> LocalFutureObj<'a, T>`
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Performs the conversion.

`impl<'a, T> Unpin for FutureObj<'a, T>`
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`impl<'a, T> Debug for FutureObj<'a, T>`
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`fn fmt(&self, f: &mut Formatter) -> Result<(), Error>`
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Formats the value using the given formatter. Read more

`impl<'a, T> Send for FutureObj<'a, T>`
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`impl<'a, F> From<PinBox<F>> for FutureObj<'a, ()> where F: 'a + Send + Future<Output = ()>,`
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`fn from(boxed: PinBox<F>) -> FutureObj<'a, ()>`
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Performs the conversion.

`impl<'a, F> From<Box<F>> for FutureObj<'a, ()> where F: 'a + Send + Future<Output = ()>,`
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`fn from(boxed: Box<F>) -> FutureObj<'a, ()>`
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Performs the conversion.

Auto Trait Implementations

`impl<'a, T> !Sync for FutureObj<'a, T>`

Blanket Implementations

`impl<T> From for T`
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`fn from(t: T) -> T`
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Performs the conversion.

`impl<T, U> TryFrom for T where T: From,`
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`type Error = !`

🔬 This is a nightly-only experimental API. (try_from)

The type returned in the event of a conversion error.

`fn try_from(value: U) -> Result<T, <T as TryFrom>::Error>`
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🔬 This is a nightly-only experimental API. (try_from)

Performs the conversion.

`impl<T, U> TryInto for T where U: TryFrom<T>,`
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`type Error = >::Error`

🔬 This is a nightly-only experimental API. (try_from)

The type returned in the event of a conversion error.

`fn try_into(self) -> Result<U, >::Error>`
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🔬 This is a nightly-only experimental API. (try_from)

Performs the conversion.

`impl<T, U> Into for T where U: From<T>,`
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`fn into(self) -> U`
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Performs the conversion.

`impl<T> Borrow for T where T: ?Sized,`
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ⓘImportant traits for &'a mut I
Important traits for &'a mut I
`impl<'a, I> Iterator for &'a mut I where I: Iterator + ?Sized, type Item = ::Item;impl<'a, R> Read for &'a mut R where R: Read + ?Sized, impl<'a, W> Write for &'a mut W where W: Write + ?Sized,`
`fn borrow(&self) -> &T`
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Immutably borrows from an owned value. Read more

`impl<T> BorrowMut for T where T: ?Sized,`
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ⓘImportant traits for &'a mut I
Important traits for &'a mut I
`impl<'a, I> Iterator for &'a mut I where I: Iterator + ?Sized, type Item = ::Item;impl<'a, R> Read for &'a mut R where R: Read + ?Sized, impl<'a, W> Write for &'a mut W where W: Write + ?Sized,`
`fn borrow_mut(&mut self) -> &mut T`
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Mutably borrows from an owned value. Read more

`impl<T> Any for T where T: 'static + ?Sized,`
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`fn get_type_id(&self) -> TypeId`
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🔬 This is a nightly-only experimental API. (get_type_id)

this method will likely be replaced by an associated static

Gets the TypeId of self. Read more

`impl<T> FutureExt for T where T: Future + ?Sized,`
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`fn map<U, F>(self, f: F) -> Map<Self, F> where F: FnOnce(Self::Output) -> U,`
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Map this future's output to a different type, returning a new future of the resulting type. Read more

`fn then<Fut, F>(self, f: F) -> Then<Self, Fut, F> where F: FnOnce(Self::Output) -> Fut, Fut: Future,`
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Chain on a computation for when a future finished, passing the result of the future to the provided closure f. Read more

`fn join<Fut2>(self, other: Fut2) -> Join<Self, Fut2> where Fut2: Future,`
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Joins the result of two futures, waiting for them both to complete. Read more

`fn join3<Fut2, Fut3>( self, future2: Fut2, future3: Fut3 ) -> Join3<Self, Fut2, Fut3> where Fut2: Future, Fut3: Future,`
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Same as join, but with more futures. Read more

`fn join4<Fut2, Fut3, Fut4>( self, future2: Fut2, future3: Fut3, future4: Fut4 ) -> Join4<Self, Fut2, Fut3, Fut4> where Fut2: Future, Fut3: Future + Future, Fut4: Future,`
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Same as join, but with more futures. Read more

`fn join5<Fut2, Fut3, Fut4, Fut5>( self, future2: Fut2, future3: Fut3, future4: Fut4, future5: Fut5 ) -> Join5<Self, Fut2, Fut3, Fut4, Fut5> where Fut2: Future, Fut3: Future + Future, Fut4: Future, Fut5: Future,`
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Same as join, but with more futures. Read more

`fn into_stream(self) -> IntoStream<Self>`
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Convert this future into a single element stream. Read more

`fn flatten(self) -> Flatten<Self> where Self::Output: Future,`
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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::Output: Stream,`
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Flatten the execution of this future when the successful result of this future is a stream. Read more

`fn fuse(self) -> Fuse<Self>`
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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::Output),`
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Do something with the output of a future before passing it on. Read more

`fn catch_unwind(self) -> CatchUnwind<Self> where Self: UnwindSafe,`
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Catches unwinding panics while polling the future. Read more

`fn shared(self) -> Shared<Self>`
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Create a cloneable handle to this future where all handles will resolve to the same result. Read more

`fn boxed(self) -> PinBox<Self>`
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Wrap the future in a Box, pinning it.

`fn unit_error(self) -> UnitError<Self>`
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Turns a Future into a TryFuture with Error = ().

`fn with_spawner<Sp>(self, spawner: Sp) -> WithSpawner<Self, Sp> where Sp: Spawn,`
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Assigns the provided Spawn to be used when spawning tasks from within the future. Read more

`fn poll_unpin(&mut self, cx: &mut Context) -> Poll<Self::Output> where Self: Unpin,`
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A convenience for calling Future::poll on Unpin future types.

`impl<F, T, E> TryFuture for F where F: Future<Output = Result<T, E>>,`
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`type Ok = T`

The type of successful values yielded by this future

`type Error = E`

The type of failures yielded by this future

`fn try_poll(self: PinMut<F>, cx: &mut Context) -> Poll<<F as Future>::Output>`
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Poll this TryFuture as if it were a Future. Read more

`impl<Fut> TryFutureExt for Fut where Fut: TryFuture,`
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`fn flatten_sink(self) -> FlattenSink<Self, Self::Ok> where Self::Ok: Sink, <Self::Ok as Sink>::SinkError == Self::Error,`
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Flattens the execution of this future when the successful result of this future is a [Sink]. Read more

`fn map_ok<T, F>(self, f: F) -> MapOk<Self, F> where F: FnOnce(Self::Ok) -> T,`
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Maps this future's success value to a different value. Read more

`fn map_err<E, F>(self, f: F) -> MapErr<Self, F> where F: FnOnce(Self::Error) -> E,`
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Maps this future's error value to a different value. Read more

`fn err_into<E>(self) -> ErrInto<Self, E> where Self::Error: Into<E>,`
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Maps this future's Error to a new error type using the Into trait. Read more

`fn and_then<Fut, F>(self, f: F) -> AndThen<Self, Fut, F> where F: FnOnce(Self::Ok) -> Fut, Fut: TryFuture<Error = Self::Error>,`
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Executes another future after this one resolves successfully. The success value is passed to a closure to create this subsequent future. Read more

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

`fn unwrap_or_else<F>(self, f: F) -> UnwrapOrElse<Self, F> where F: FnOnce(Self::Error) -> Self::Ok,`
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Unwraps this future's ouput, producing a future with this future's Ok type as its Output type. Read more

`fn compat<Sp>(self, spawn: Sp) -> Compat<Self, Sp> where Self: Unpin, Sp: Spawn,`
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Wraps a [TryFuture] into a future compatable with libraries using futures 0.1 future definitons. Requires the compat feature to enable. Read more

`fn into_future(self) -> IntoFuture<Self>`
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Wraps a [TryFuture] into a type that implements Future. Read more

`fn try_join<Fut2>(self, other: Fut2) -> TryJoin<Self, Fut2> where Fut2: TryFuture<Error = Self::Error>,`
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Joins the result of two futures, waiting for them both to complete or for one to produce an error. Read more

`fn try_join3<Fut2, Fut3>( self, future2: Fut2, future3: Fut3 ) -> TryJoin3<Self, Fut2, Fut3> where Fut2: TryFuture<Error = Self::Error>, Fut3: TryFuture<Error = Self::Error>,`
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Same as try_join, but with more futures. Read more

`fn try_join4<Fut2, Fut3, Fut4>( self, future2: Fut2, future3: Fut3, future4: Fut4 ) -> TryJoin4<Self, Fut2, Fut3, Fut4> where Fut2: TryFuture<Error = Self::Error>, Fut3: TryFuture<Error = Self::Error>, Fut4: TryFuture<Error = Self::Error>,`
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Same as try_join, but with more futures. Read more

`fn try_join5<Fut2, Fut3, Fut4, Fut5>( self, future2: Fut2, future3: Fut3, future4: Fut4, future5: Fut5 ) -> TryJoin5<Self, Fut2, Fut3, Fut4, Fut5> where Fut2: TryFuture<Error = Self::Error>, Fut3: TryFuture<Error = Self::Error>, Fut4: TryFuture<Error = Self::Error>, Fut5: TryFuture<Error = Self::Error>,`
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Same as try_join, but with more futures. Read more

[−][src]Struct futures::future::FutureObj

Methods

impl<'a, T> FutureObj<'a, T>[src][−]

pub fn new<F>(f: F) -> FutureObj<'a, T> where F: Send + UnsafeFutureObj<'a, T>, [src][−]

Trait Implementations

impl<'a, T> Future for FutureObj<'a, T>[src][+]

type Output = T

fn poll(self: PinMut<FutureObj<'a, T>>, cx: &mut Context) -> Poll<T>[src][−]

impl<'a, T> From<FutureObj<'a, T>> for LocalFutureObj<'a, T>[src][+]

fn from(f: FutureObj<'a, T>) -> LocalFutureObj<'a, T>[src][−]

impl<'a, T> Unpin for FutureObj<'a, T>[src]

impl<'a, T> Debug for FutureObj<'a, T>[src][+]

fn fmt(&self, f: &mut Formatter) -> Result<(), Error>[src][−]

impl<'a, T> Send for FutureObj<'a, T>[src]

impl<'a, F> From<PinBox<F>> for FutureObj<'a, ()> where F: 'a + Send + Future<Output = ()>, [src][+]

fn from(boxed: PinBox<F>) -> FutureObj<'a, ()>[src][−]

impl<'a, F> From<Box<F>> for FutureObj<'a, ()> where F: 'a + Send + Future<Output = ()>, [src][+]

fn from(boxed: Box<F>) -> FutureObj<'a, ()>[src][−]

Auto Trait Implementations

impl<'a, T> !Sync for FutureObj<'a, T>

Blanket Implementations

impl<T> From for T[src][+]

fn from(t: T) -> T[src][−]

impl<T, U> TryFrom for T where T: From<U>, [src][+]

type Error = !

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

impl<T, U> TryInto for T where U: TryFrom<T>, [src][+]

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

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

impl<T, U> Into for T where U: From<T>, [src][+]

fn into(self) -> U[src][−]

impl<T> Borrow for T where T: ?Sized, [src][+]

Important traits for &'a mut I

impl<T> BorrowMut for T where T: ?Sized, [src][+]

Important traits for &'a mut I

impl<T> Any for T where T: 'static + ?Sized, [src][+]

fn get_type_id(&self) -> TypeId[src][−]

impl<T> FutureExt for T where T: Future + ?Sized, [src][+]

fn map<U, F>(self, f: F) -> Map<Self, F> where F: FnOnce(Self::Output) -> U, [src][−]

fn then<Fut, F>(self, f: F) -> Then<Self, Fut, F> where F: FnOnce(Self::Output) -> Fut, Fut: Future, [src][−]

fn join<Fut2>(self, other: Fut2) -> Join<Self, Fut2> where Fut2: Future, [src][−]

fn join3<Fut2, Fut3>( self, future2: Fut2, future3: Fut3) -> Join3<Self, Fut2, Fut3> where Fut2: Future, Fut3: Future, [src][−]

fn join4<Fut2, Fut3, Fut4>( self, future2: Fut2, future3: Fut3, future4: Fut4) -> Join4<Self, Fut2, Fut3, Fut4> where Fut2: Future, Fut3: Future + Future, Fut4: Future, [src][−]

fn join5<Fut2, Fut3, Fut4, Fut5>( self, future2: Fut2, future3: Fut3, future4: Fut4, future5: Fut5) -> Join5<Self, Fut2, Fut3, Fut4, Fut5> where Fut2: Future, Fut3: Future + Future, Fut4: Future, Fut5: Future, [src][−]

fn into_stream(self) -> IntoStream<Self>[src][−]

fn flatten(self) -> Flatten<Self> where Self::Output: Future, [src][−]

fn flatten_stream(self) -> FlattenStream<Self> where Self::Output: Stream, [src][−]

fn fuse(self) -> Fuse<Self>[src][−]

fn inspect<F>(self, f: F) -> Inspect<Self, F> where F: FnOnce(&Self::Output), [src][−]

fn catch_unwind(self) -> CatchUnwind<Self> where Self: UnwindSafe, [src][−]

fn shared(self) -> Shared<Self>[src][−]

fn boxed(self) -> PinBox<Self>[src][−]

fn unit_error(self) -> UnitError<Self>[src][−]

fn with_spawner<Sp>(self, spawner: Sp) -> WithSpawner<Self, Sp> where Sp: Spawn, [src][−]

fn poll_unpin(&mut self, cx: &mut Context) -> Poll<Self::Output> where Self: Unpin, [src][−]

impl<F, T, E> TryFuture for F where F: Future<Output = Result<T, E>>, [src][+]

type Ok = T

type Error = E

fn try_poll(self: PinMut<F>, cx: &mut Context) -> Poll<<F as Future>::Output>[src][−]

impl<Fut> TryFutureExt for Fut where Fut: TryFuture, [src][+]

fn flatten_sink(self) -> FlattenSink<Self, Self::Ok> where Self::Ok: Sink, <Self::Ok as Sink>::SinkError == Self::Error, [src][−]

fn map_ok<T, F>(self, f: F) -> MapOk<Self, F> where F: FnOnce(Self::Ok) -> T, [src][−]

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

fn err_into<E>(self) -> ErrInto<Self, E> where Self::Error: Into<E>, [src][−]

fn and_then<Fut, F>(self, f: F) -> AndThen<Self, Fut, F> where F: FnOnce(Self::Ok) -> Fut, Fut: TryFuture<Error = Self::Error>, [src][−]

fn or_else<Fut, F>(self, f: F) -> OrElse<Self, Fut, F> where F: FnOnce(Self::Error) -> Fut, Fut: TryFuture<Ok = Self::Ok>, [src][−]

fn unwrap_or_else<F>(self, f: F) -> UnwrapOrElse<Self, F> where F: FnOnce(Self::Error) -> Self::Ok, [src][−]

fn compat<Sp>(self, spawn: Sp) -> Compat<Self, Sp> where Self: Unpin, Sp: Spawn, [src][−]

fn into_future(self) -> IntoFuture<Self>[src][−]

fn try_join<Fut2>(self, other: Fut2) -> TryJoin<Self, Fut2> where Fut2: TryFuture<Error = Self::Error>, [src][−]

fn try_join3<Fut2, Fut3>( self, future2: Fut2, future3: Fut3) -> TryJoin3<Self, Fut2, Fut3> where Fut2: TryFuture<Error = Self::Error>, Fut3: TryFuture<Error = Self::Error>, [src][−]

fn try_join4<Fut2, Fut3, Fut4>( self, future2: Fut2, future3: Fut3, future4: Fut4) -> TryJoin4<Self, Fut2, Fut3, Fut4> where Fut2: TryFuture<Error = Self::Error>, Fut3: TryFuture<Error = Self::Error>, Fut4: TryFuture<Error = Self::Error>, [src][−]

`impl<'a, T> FutureObj<'a, T>`
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`pub fn new<F>(f: F) -> FutureObj<'a, T> where F: Send + UnsafeFutureObj<'a, T>,`
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`impl<'a, T> Future for FutureObj<'a, T>`
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`type Output = T`

`fn poll(self: PinMut<FutureObj<'a, T>>, cx: &mut Context) -> Poll<T>`
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`impl<'a, T> From<FutureObj<'a, T>> for LocalFutureObj<'a, T>`
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`fn from(f: FutureObj<'a, T>) -> LocalFutureObj<'a, T>`
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`impl<'a, T> Unpin for FutureObj<'a, T>`
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`impl<'a, T> Debug for FutureObj<'a, T>`
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`fn fmt(&self, f: &mut Formatter) -> Result<(), Error>`
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`impl<'a, T> Send for FutureObj<'a, T>`
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`impl<'a, F> From<PinBox<F>> for FutureObj<'a, ()> where F: 'a + Send + Future<Output = ()>,`
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`fn from(boxed: PinBox<F>) -> FutureObj<'a, ()>`
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`impl<'a, F> From<Box<F>> for FutureObj<'a, ()> where F: 'a + Send + Future<Output = ()>,`
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`fn from(boxed: Box<F>) -> FutureObj<'a, ()>`
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`impl<'a, T> !Sync for FutureObj<'a, T>`

`impl<T> From for T`
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`fn from(t: T) -> T`
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`impl<T, U> TryFrom for T where T: From<U>,`
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`type Error = !`

`fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>`
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`impl<T, U> TryInto for T where U: TryFrom<T>,`
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`type Error = <U as TryFrom<T>>::Error`

`fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>`
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`impl<T, U> Into for T where U: From<T>,`
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`fn into(self) -> U`
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`impl<T> Borrow for T where T: ?Sized,`
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`impl<T> BorrowMut for T where T: ?Sized,`
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`impl<T> Any for T where T: 'static + ?Sized,`
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`fn get_type_id(&self) -> TypeId`
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`impl<T> FutureExt for T where T: Future + ?Sized,`
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`fn map<U, F>(self, f: F) -> Map<Self, F> where F: FnOnce(Self::Output) -> U,`
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`fn then<Fut, F>(self, f: F) -> Then<Self, Fut, F> where F: FnOnce(Self::Output) -> Fut, Fut: Future,`
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`fn join<Fut2>(self, other: Fut2) -> Join<Self, Fut2> where Fut2: Future,`
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`fn join3<Fut2, Fut3>( self, future2: Fut2, future3: Fut3 ) -> Join3<Self, Fut2, Fut3> where Fut2: Future, Fut3: Future,`
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`fn join4<Fut2, Fut3, Fut4>( self, future2: Fut2, future3: Fut3, future4: Fut4 ) -> Join4<Self, Fut2, Fut3, Fut4> where Fut2: Future, Fut3: Future + Future, Fut4: Future,`
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`fn join5<Fut2, Fut3, Fut4, Fut5>( self, future2: Fut2, future3: Fut3, future4: Fut4, future5: Fut5 ) -> Join5<Self, Fut2, Fut3, Fut4, Fut5> where Fut2: Future, Fut3: Future + Future, Fut4: Future, Fut5: Future,`
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`fn into_stream(self) -> IntoStream<Self>`
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`fn flatten(self) -> Flatten<Self> where Self::Output: Future,`
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`fn flatten_stream(self) -> FlattenStream<Self> where Self::Output: Stream,`
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`fn fuse(self) -> Fuse<Self>`
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`fn inspect<F>(self, f: F) -> Inspect<Self, F> where F: FnOnce(&Self::Output),`
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`fn catch_unwind(self) -> CatchUnwind<Self> where Self: UnwindSafe,`
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`fn shared(self) -> Shared<Self>`
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`fn boxed(self) -> PinBox<Self>`
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`fn unit_error(self) -> UnitError<Self>`
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`fn with_spawner<Sp>(self, spawner: Sp) -> WithSpawner<Self, Sp> where Sp: Spawn,`
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`fn poll_unpin(&mut self, cx: &mut Context) -> Poll<Self::Output> where Self: Unpin,`
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`impl<F, T, E> TryFuture for F where F: Future<Output = Result<T, E>>,`
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`type Ok = T`

`type Error = E`

`fn try_poll(self: PinMut<F>, cx: &mut Context) -> Poll<<F as Future>::Output>`
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`impl<Fut> TryFutureExt for Fut where Fut: TryFuture,`
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`fn flatten_sink(self) -> FlattenSink<Self, Self::Ok> where Self::Ok: Sink, <Self::Ok as Sink>::SinkError == Self::Error,`
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`fn map_ok<T, F>(self, f: F) -> MapOk<Self, F> where F: FnOnce(Self::Ok) -> T,`
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`fn map_err<E, F>(self, f: F) -> MapErr<Self, F> where F: FnOnce(Self::Error) -> E,`
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`fn err_into<E>(self) -> ErrInto<Self, E> where Self::Error: Into<E>,`
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`fn and_then<Fut, F>(self, f: F) -> AndThen<Self, Fut, F> where F: FnOnce(Self::Ok) -> Fut, Fut: TryFuture<Error = Self::Error>,`
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`fn or_else<Fut, F>(self, f: F) -> OrElse<Self, Fut, F> where F: FnOnce(Self::Error) -> Fut, Fut: TryFuture<Ok = Self::Ok>,`
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`fn unwrap_or_else<F>(self, f: F) -> UnwrapOrElse<Self, F> where F: FnOnce(Self::Error) -> Self::Ok,`
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`fn compat<Sp>(self, spawn: Sp) -> Compat<Self, Sp> where Self: Unpin, Sp: Spawn,`
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`fn into_future(self) -> IntoFuture<Self>`
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`fn try_join<Fut2>(self, other: Fut2) -> TryJoin<Self, Fut2> where Fut2: TryFuture<Error = Self::Error>,`
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`fn try_join3<Fut2, Fut3>( self, future2: Fut2, future3: Fut3 ) -> TryJoin3<Self, Fut2, Fut3> where Fut2: TryFuture<Error = Self::Error>, Fut3: TryFuture<Error = Self::Error>,`
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`fn try_join4<Fut2, Fut3, Fut4>( self, future2: Fut2, future3: Fut3, future4: Fut4 ) -> TryJoin4<Self, Fut2, Fut3, Fut4> where Fut2: TryFuture<Error = Self::Error>, Fut3: TryFuture<Error = Self::Error>, Fut4: TryFuture<Error = Self::Error>,`
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