Struct futures_util::future::Lazy

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pub struct Lazy<F> { /* private fields */ }

Expand description

Future for the lazy function.

Trait Implementations

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impl<F: Debug> Debug for Lazy<F>

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

Formats the value using the given formatter. Read more

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impl<F, R> FusedFuture for Lazy<F> where
F: FnOnce(&mut Context<'_>) -> R,

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fn is_terminated(&self) -> bool

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

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impl<F, R> Future for Lazy<F> where
F: FnOnce(&mut Context<'_>) -> R,

type Output = R

The type of value produced on completion.

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

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

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impl<F> Unpin for Lazy<F>

Auto Trait Implementations

impl<F> RefUnwindSafe for Lazy<F> where
F: RefUnwindSafe,

impl<F> Send for Lazy<F> where
F: Send,

impl<F> Sync for Lazy<F> where
F: Sync,

impl<F> UnwindSafe for Lazy<F> where
F: UnwindSafe,

Blanket Implementations

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

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more

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

const: unstable · source

fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more

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

const: unstable · source

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

Mutably borrows from an owned value. Read more

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impl<T> From<T> for T

const: unstable · source

fn from(t: T) -> T

Returns the argument unchanged.

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

const: unstable · 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.

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impl<F> IntoFuture for F where
F: Future,

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 IntoFuture = F

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

Which kind of future are we turning this into?

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

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

Creates a future from a value.

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

type Error = Infallible

The type returned in the event of a conversion error.

const: unstable · source

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

Performs the conversion.

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impl<F, T, E> TryFuture for F where
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

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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

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

type Error = >::Error

The type returned in the event of a conversion error.

const: unstable · source

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

Performs the conversion.

Struct futures_util::future::Lazy

Trait Implementations

impl<F: Debug> Debug for Lazy<F>

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

impl<F, R> FusedFuture for Lazy<F> where
F: FnOnce(&mut Context<'_>) -> R,

fn is_terminated(&self) -> bool

impl<F, R> Future for Lazy<F> where
F: FnOnce(&mut Context<'_>) -> R,

type Output = R

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

impl<F> Unpin for Lazy<F>

Auto Trait Implementations

impl<F> RefUnwindSafe for Lazy<F> where
F: RefUnwindSafe,

impl<F> Send for Lazy<F> where
F: Send,

impl<F> Sync for Lazy<F> where
F: Sync,

impl<F> UnwindSafe for Lazy<F> where
F: UnwindSafe,

Blanket Implementations

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

fn type_id(&self) -> TypeId

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

fn borrow(&self) -> &T

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

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

impl<T> From<T> for T

fn from(t: T) -> T

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

fn into(self) -> U

impl<F> IntoFuture for F where
F: Future,

type Output = <F as Future>::Output

type IntoFuture = F

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

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

type Error = Infallible

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

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

type Ok = T

type Error = E

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

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

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

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

Struct futures_util::future::Lazy

Trait Implementations

impl<F: Debug> Debug for Lazy<F>

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

impl<F, R> FusedFuture for Lazy<F> where F: FnOnce(&mut Context<'_>) -> R,

fn is_terminated(&self) -> bool

impl<F, R> Future for Lazy<F> where F: FnOnce(&mut Context<'_>) -> R,

type Output = R

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

impl<F> Unpin for Lazy<F>

Auto Trait Implementations

impl<F> RefUnwindSafe for Lazy<F> where F: RefUnwindSafe,

impl<F> Send for Lazy<F> where F: Send,

impl<F> Sync for Lazy<F> where F: Sync,

impl<F> UnwindSafe for Lazy<F> where F: UnwindSafe,

Blanket Implementations

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

fn type_id(&self) -> TypeId

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

fn borrow(&self) -> &T

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

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

impl<T> From<T> for T

fn from(t: T) -> T

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

fn into(self) -> U

impl<F> IntoFuture for F where F: Future,

type Output = <F as Future>::Output

type IntoFuture = F

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

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

type Error = Infallible

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

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

type Ok = T

type Error = E

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

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

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

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

impl<F, R> FusedFuture for Lazy<F> where
F: FnOnce(&mut Context<'_>) -> R,

impl<F, R> Future for Lazy<F> where
F: FnOnce(&mut Context<'_>) -> R,

impl<F> RefUnwindSafe for Lazy<F> where
F: RefUnwindSafe,

impl<F> Send for Lazy<F> where
F: Send,

impl<F> Sync for Lazy<F> where
F: Sync,

impl<F> UnwindSafe for Lazy<F> where
F: UnwindSafe,

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

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

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

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

impl<F> IntoFuture for F where
F: Future,

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

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

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

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