Struct tower_balance::p2c::MakeFuture[−][src]

[+] Show declaration

pub struct MakeFuture<F, Req> { /* fields omitted */ }

[−]

Makes a balancer instance.

Trait Implementations

`impl<F: Debug, Req: Debug> Debug for MakeFuture<F, Req>`[src][+]

[+] Show hidden undocumented items

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

`impl<F, T, E, Req> Future for MakeFuture<F, Req> where F: Future<Output = Result<T, E>>, T: Discover, <T as Discover>::Service: Service<Req>, <<T as Discover>::Service as Service<Req>>::Error: Into<Box<dyn Error + Send + Sync>>,` [src][+]

[+] Show hidden undocumented items

`type Output = Result<Balance<T, Req>, E>`

The type of value produced on completion.

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

`impl<F, Req> PinnedDrop for MakeFuture<F, Req>`[src][+]

[+] Show hidden undocumented items

`unsafe fn drop(self: Pin<&mut Self>)`[src]

`impl<'pin, F, Req> Unpin for MakeFuture<F, Req> where __MakeFuture<'pin, F, Req>: Unpin,` [src]

`impl<F, Req> UnsafeUnpin for MakeFuture<F, Req>`[src]

Auto Trait Implementations

`impl<F, Req> RefUnwindSafe for MakeFuture<F, Req> where F: RefUnwindSafe,`

`impl<F, Req> Send for MakeFuture<F, Req> where F: Send,`

`impl<F, Req> Sync for MakeFuture<F, Req> where F: Sync,`

`impl<F, Req> UnwindSafe for MakeFuture<F, Req> where F: UnwindSafe,`

Blanket Implementations

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

[+] Show hidden undocumented items

`pub fn type_id(&self) -> TypeId`[src][−]

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

[+] Show hidden undocumented items

`pub fn borrow(&self) -> &T`[src][−]

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

[+] Show hidden undocumented items

`pub fn borrow_mut(&mut self) -> &mut T`[src][−]

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

[+] Show hidden undocumented items

`pub fn from(t: T) -> T`[src][−]

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

[+] Show hidden undocumented items

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

`pub fn map_into(self) -> MapInto<Self, U> where Self::Output: Into,` [src][−]

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

`pub fn left_future(self) -> Either<Self, B> where B: Future<Output = Self::Output>,` [src][−]

`pub fn right_future<A>(self) -> Either<A, Self> where A: Future<Output = Self::Output>,` [src][−]

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

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

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

`pub fn fuse(self) -> Fuse<Self>`[src][−]

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

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

`pub fn shared(self) -> Shared<Self> where Self::Output: Clone,` [src][−]

`pub fn remote_handle(self) -> (Remote<Self>, RemoteHandle<Self::Output>)`[src][−]

`pub fn boxed<'a>( self ) -> Pin<Box<dyn Future<Output = Self::Output> + 'a + Send, Global>> where Self: Send + 'a,` [src][−]

`pub fn boxed_local<'a>( self ) -> Pin<Box<dyn Future<Output = Self::Output> + 'a, Global>> where Self: 'a,` [src][−]

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

`pub fn never_error(self) -> NeverError<Self>`[src][−]

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

`pub fn now_or_never(self) -> Option<Self::Output>`[src][−]

`impl<T> Instrument for T`[src][+]

[+] Show hidden undocumented items

`pub fn instrument(self, span: Span) -> Instrumented<Self>`[src][−]

`pub fn in_current_span(self) -> Instrumented<Self>`[src][−]

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

[+] Show hidden undocumented items

`pub fn into(self) -> U`[src][−]

`impl<F> IntoFuture for F where F: Future,` [src][+]

[+] Show hidden undocumented items

`type Output = <F as Future>::Output`

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

The output that the future will produce on completion.

`type Future = F`

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

Which kind of future are we turning this into?

`pub fn into_future(self) -> <F as IntoFuture>::Future`[src][−]

`impl<T> Pointable for T`[src][+]

[+] Show hidden undocumented items

`pub const ALIGN: usize`[src][−][−]

`type Init = T`

The type for initializers.

`pub unsafe fn init(init: <T as Pointable>::Init) -> usize`[src][−]

`pub unsafe fn deref<'a>(ptr: usize) -> &'a T`[src][−]

`pub unsafe fn deref_mut<'a>(ptr: usize) -> &'a mut T`[src][−]

`pub unsafe fn drop(ptr: usize)`[src][−]

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

[+] Show hidden undocumented items

`type Error = Infallible`

The type returned in the event of a conversion error.

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

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

[+] Show hidden undocumented items

`type Ok = T`

The type of successful values yielded by this future

`type Error = E`

The type of failures yielded by this future

`pub fn try_poll( self: Pin<&mut F>, cx: &mut Context<'_> ) -> Poll<<F as Future>::Output>`[src][−]

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

[+] Show hidden undocumented items

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

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

`pub 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,` [src][−]

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

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

`pub fn ok_into(self) -> OkInto<Self, U> where Self::Ok: Into,` [src][−]

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

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

`pub fn inspect_ok<F>(self, f: F) -> InspectOk<Self, F> where F: FnOnce(&Self::Ok),` [src][−]

`pub fn inspect_err<F>(self, f: F) -> InspectErr<Self, F> where F: FnOnce(&Self::Error),` [src][−]

`pub fn try_flatten(self) -> TryFlatten<Self, Self::Ok> where Self::Ok: TryFuture, <Self::Ok as TryFuture>::Error == Self::Error,` [src][−]

`pub fn try_flatten_stream(self) -> TryFlattenStream<Self> where Self::Ok: TryStream, <Self::Ok as TryStream>::Error == Self::Error,` [src][−]

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

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

`pub fn try_poll_unpin( &mut self, cx: &mut Context<'_> ) -> Poll<Result<Self::Ok, Self::Error>> where Self: Unpin,` [src][−]

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

[+] Show hidden undocumented items

`type Error = >::Error`

The type returned in the event of a conversion error.

`pub fn try_into(self) -> Result<U, >::Error>`[src][−]

`impl<V, T> VZip<V> for T where V: MultiLane<T>,` [src][+]

[+] Show hidden undocumented items

Struct tower_balance::p2c::MakeFuture[−][src]

Trait Implementations

impl<F: Debug, Req: Debug> Debug for MakeFuture<F, Req>[src][+]

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

impl<F, T, E, Req> Future for MakeFuture<F, Req> where F: Future<Output = Result<T, E>>, T: Discover, <T as Discover>::Service: Service<Req>, <<T as Discover>::Service as Service<Req>>::Error: Into<Box<dyn Error + Send + Sync>>, [src][+]

type Output = Result<Balance<T, Req>, E>

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

impl<F, Req> PinnedDrop for MakeFuture<F, Req>[src][+]

unsafe fn drop(self: Pin<&mut Self>)[src]

impl<'pin, F, Req> Unpin for MakeFuture<F, Req> where __MakeFuture<'pin, F, Req>: Unpin, [src]

impl<F, Req> UnsafeUnpin for MakeFuture<F, Req>[src]

Auto Trait Implementations

impl<F, Req> RefUnwindSafe for MakeFuture<F, Req> where F: RefUnwindSafe,

impl<F, Req> Send for MakeFuture<F, Req> where F: Send,

impl<F, Req> Sync for MakeFuture<F, Req> where F: Sync,

impl<F, Req> UnwindSafe for MakeFuture<F, Req> where F: UnwindSafe,

Blanket Implementations

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

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

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

pub fn borrow(&self) -> &T[src][−]

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

pub fn borrow_mut(&mut self) -> &mut T[src][−]

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

pub fn from(t: T) -> T[src][−]

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

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

pub fn map_into<U>(self) -> MapInto<Self, U> where Self::Output: Into<U>, [src][−]

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

pub fn left_future<B>(self) -> Either<Self, B> where B: Future<Output = Self::Output>, [src][−]

pub fn right_future<A>(self) -> Either<A, Self> where A: Future<Output = Self::Output>, [src][−]

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

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

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

pub fn fuse(self) -> Fuse<Self>[src][−]

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

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

pub fn shared(self) -> Shared<Self> where Self::Output: Clone, [src][−]

pub fn remote_handle(self) -> (Remote<Self>, RemoteHandle<Self::Output>)[src][−]

pub fn boxed<'a>( self) -> Pin<Box<dyn Future<Output = Self::Output> + 'a + Send, Global>> where Self: Send + 'a, [src][−]

pub fn boxed_local<'a>( self) -> Pin<Box<dyn Future<Output = Self::Output> + 'a, Global>> where Self: 'a, [src][−]

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

pub fn never_error(self) -> NeverError<Self>[src][−]

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

pub fn now_or_never(self) -> Option<Self::Output>[src][−]

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

pub fn instrument(self, span: Span) -> Instrumented<Self>[src][−]

pub fn in_current_span(self) -> Instrumented<Self>[src][−]

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

pub fn into(self) -> U[src][−]

impl<F> IntoFuture for F where F: Future, [src][+]

type Output = <F as Future>::Output

type Future = F

pub fn into_future(self) -> <F as IntoFuture>::Future[src][−]

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

pub const ALIGN: usize[src][−][−]

type Init = T

pub unsafe fn init(init: <T as Pointable>::Init) -> usize[src][−]

pub unsafe fn deref<'a>(ptr: usize) -> &'a T[src][−]

pub unsafe fn deref_mut<'a>(ptr: usize) -> &'a mut T[src][−]

pub unsafe fn drop(ptr: usize)[src][−]

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

type Error = Infallible

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

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

type Ok = T

type Error = E

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

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

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

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

pub 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, [src][−]

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

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

pub fn ok_into<U>(self) -> OkInto<Self, U> where Self::Ok: Into<U>, [src][−]

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

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

pub fn inspect_ok<F>(self, f: F) -> InspectOk<Self, F> where F: FnOnce(&Self::Ok), [src][−]

pub fn inspect_err<F>(self, f: F) -> InspectErr<Self, F> where F: FnOnce(&Self::Error), [src][−]

pub fn try_flatten(self) -> TryFlatten<Self, Self::Ok> where Self::Ok: TryFuture, <Self::Ok as TryFuture>::Error == Self::Error, [src][−]

`impl<F: Debug, Req: Debug> Debug for MakeFuture<F, Req>`[src][+]

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

`impl<F, T, E, Req> Future for MakeFuture<F, Req> where F: Future<Output = Result<T, E>>, T: Discover, <T as Discover>::Service: Service<Req>, <<T as Discover>::Service as Service<Req>>::Error: Into<Box<dyn Error + Send + Sync>>,` [src][+]

`type Output = Result<Balance<T, Req>, E>`

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

`impl<F, Req> PinnedDrop for MakeFuture<F, Req>`[src][+]

`unsafe fn drop(self: Pin<&mut Self>)`[src]

`impl<'pin, F, Req> Unpin for MakeFuture<F, Req> where __MakeFuture<'pin, F, Req>: Unpin,` [src]

`impl<F, Req> UnsafeUnpin for MakeFuture<F, Req>`[src]

`impl<F, Req> RefUnwindSafe for MakeFuture<F, Req> where F: RefUnwindSafe,`

`impl<F, Req> Send for MakeFuture<F, Req> where F: Send,`

`impl<F, Req> Sync for MakeFuture<F, Req> where F: Sync,`

`impl<F, Req> UnwindSafe for MakeFuture<F, Req> where F: UnwindSafe,`

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

`pub fn type_id(&self) -> TypeId`[src][−]

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

`pub fn borrow(&self) -> &T`[src][−]

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

`pub fn borrow_mut(&mut self) -> &mut T`[src][−]

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

`pub fn from(t: T) -> T`[src][−]

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

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

`pub fn map_into<U>(self) -> MapInto<Self, U> where Self::Output: Into<U>,` [src][−]

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

`pub fn left_future<B>(self) -> Either<Self, B> where B: Future<Output = Self::Output>,` [src][−]

`pub fn right_future<A>(self) -> Either<A, Self> where A: Future<Output = Self::Output>,` [src][−]

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

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

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

`pub fn fuse(self) -> Fuse<Self>`[src][−]

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

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

`pub fn shared(self) -> Shared<Self> where Self::Output: Clone,` [src][−]

`pub fn remote_handle(self) -> (Remote<Self>, RemoteHandle<Self::Output>)`[src][−]

`pub fn boxed<'a>( self ) -> Pin<Box<dyn Future<Output = Self::Output> + 'a + Send, Global>> where Self: Send + 'a,` [src][−]

`pub fn boxed_local<'a>( self ) -> Pin<Box<dyn Future<Output = Self::Output> + 'a, Global>> where Self: 'a,` [src][−]

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

`pub fn never_error(self) -> NeverError<Self>`[src][−]

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

`pub fn now_or_never(self) -> Option<Self::Output>`[src][−]

`impl<T> Instrument for T`[src][+]

`pub fn instrument(self, span: Span) -> Instrumented<Self>`[src][−]

`pub fn in_current_span(self) -> Instrumented<Self>`[src][−]

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

`pub fn into(self) -> U`[src][−]

`impl<F> IntoFuture for F where F: Future,` [src][+]

`type Output = <F as Future>::Output`

`type Future = F`

`pub fn into_future(self) -> <F as IntoFuture>::Future`[src][−]

`impl<T> Pointable for T`[src][+]

`pub const ALIGN: usize`[src][−][−]

`type Init = T`

`pub unsafe fn init(init: <T as Pointable>::Init) -> usize`[src][−]

`pub unsafe fn deref<'a>(ptr: usize) -> &'a T`[src][−]

`pub unsafe fn deref_mut<'a>(ptr: usize) -> &'a mut T`[src][−]

`pub unsafe fn drop(ptr: usize)`[src][−]

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

`type Error = Infallible`

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

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

`type Ok = T`

`type Error = E`

`pub fn try_poll( self: Pin<&mut F>, cx: &mut Context<'_> ) -> Poll<<F as Future>::Output>`[src][−]

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

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

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

`pub 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,` [src][−]

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

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

`pub fn ok_into<U>(self) -> OkInto<Self, U> where Self::Ok: Into<U>,` [src][−]

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

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

`pub fn inspect_ok<F>(self, f: F) -> InspectOk<Self, F> where F: FnOnce(&Self::Ok),` [src][−]

`pub fn inspect_err<F>(self, f: F) -> InspectErr<Self, F> where F: FnOnce(&Self::Error),` [src][−]

`pub fn try_flatten(self) -> TryFlatten<Self, Self::Ok> where Self::Ok: TryFuture, <Self::Ok as TryFuture>::Error == Self::Error,` [src][−]

`pub fn try_flatten_stream(self) -> TryFlattenStream<Self> where Self::Ok: TryStream, <Self::Ok as TryStream>::Error == Self::Error,` [src][−]

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

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

`pub fn try_poll_unpin( &mut self, cx: &mut Context<'_> ) -> Poll<Result<Self::Ok, Self::Error>> where Self: Unpin,` [src][−]