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

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

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>`[src]

ⓘImportant traits for FutureObj<'a, T>
Important traits for FutureObj<'a, T>
`impl<'a, T> Future for FutureObj<'a, T> type Output = T;`
`pub fn new<F: UnsafeFutureObj<'a, T> + Send>(f: F) -> FutureObj<'a, T>`[src]

Create a FutureObj from a custom trait object representation.

Trait Implementations

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

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

ⓘImportant traits for LocalFutureObj<'a, T>
Important traits for LocalFutureObj<'a, T>
`impl<'a, T> Future for LocalFutureObj<'a, T> type Output = T;`
`fn from(f: FutureObj<'a, T>) -> LocalFutureObj<'a, T>`[src]

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

`fn from(boxed: Pin<Box<F>>) -> Self`[src]

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

`fn from(boxed: Box<F>) -> Self`[src]

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

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

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

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

`type Output = T`

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

futures in libcore are unstable

The type of value produced on completion.

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

Auto Trait Implementations

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

Blanket Implementations

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

`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(Pin<&mut F>, &mut Context) -> Poll<<F as Future>::Output>`[src]

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

`fn from(t: T) -> T`[src]

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

`fn into(self) -> U`[src]

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

`type Error = Infallible`

The type returned in the event of a conversion error.

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

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

ⓘImportant traits for &'_ mut F
Important traits for &'_ mut F
`impl<'_, F> Future for &'_ mut F where F: Unpin + Future + ?Sized, type Output = <F as Future>::Output;`
`fn borrow(&self) -> &T`[src]

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

ⓘImportant traits for &'_ mut F
Important traits for &'_ mut F
`impl<'_, F> Future for &'_ mut F where F: Unpin + Future + ?Sized, type Output = <F as Future>::Output;`
`fn borrow_mut(&mut self) -> &mut T`[src]

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

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

The type returned in the event of a conversion error.

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

Methods

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

ⓘImportant traits for FutureObj<'a, T>Important traits for FutureObj<'a, T>impl<'a, T> Future for FutureObj<'a, T> type Output = T;pub fn new<F: UnsafeFutureObj<'a, T> + Send>(f: F) -> FutureObj<'a, T>[src]

Important traits for FutureObj<'a, T>

Trait Implementations

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

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

ⓘImportant traits for LocalFutureObj<'a, T>Important traits for LocalFutureObj<'a, T>impl<'a, T> Future for LocalFutureObj<'a, T> type Output = T;fn from(f: FutureObj<'a, T>) -> LocalFutureObj<'a, T>[src]

Important traits for LocalFutureObj<'a, T>

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

fn from(boxed: Pin<Box<F>>) -> Self[src]

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

fn from(boxed: Box<F>) -> Self[src]

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

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

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

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

type Output = T

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

Auto Trait Implementations

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

Blanket Implementations

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

type Ok = T

type Error = E

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

impl<T> From for T[src]

fn from(t: T) -> T[src]

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

fn into(self) -> U[src]

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

type Error = Infallible

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

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

ⓘImportant traits for &'_ mut FImportant traits for &'_ mut Fimpl<'_, F> Future for &'_ mut F where F: Unpin + Future + ?Sized, type Output = <F as Future>::Output;fn borrow(&self) -> &T[src]

Important traits for &'_ mut F

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

ⓘImportant traits for &'_ mut FImportant traits for &'_ mut Fimpl<'_, F> Future for &'_ mut F where F: Unpin + Future + ?Sized, type Output = <F as Future>::Output;fn borrow_mut(&mut self) -> &mut T[src]