# Struct std::future::PollFn

1.64.0 · source ·

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

Expand description

A Future that wraps a function returning `Poll`.

This `struct` is created by `poll_fn()`. See its documentation for more.

## Trait Implementations§

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### impl<F> Debug for PollFn<F>

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

Formats the value using the given formatter. Read more
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### impl<T, F> Future for PollFn<F>where F: FnMut(&mut Context<'_>) -> Poll<T>,

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#### type Output = T

The type of value produced on completion.
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#### fn poll(self: Pin<&mut PollFn<F>>, cx: &mut Context<'_>) -> Poll<T>

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 PollFn<F>where F: Unpin,

## Auto Trait Implementations§

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### impl<F> RefUnwindSafe for PollFn<F>where F: RefUnwindSafe,

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### impl<F> Send for PollFn<F>where F: Send,

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### impl<F> Sync for PollFn<F>where F: Sync,

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### impl<F> UnwindSafe for PollFn<F>where F: UnwindSafe,

## Blanket Implementations§

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### impl<T> Any for Twhere 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 Twhere T: ?Sized,

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#### fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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### impl<T> BorrowMut<T> for Twhere T: ?Sized,

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#### 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

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#### fn from(t: T) -> T

Returns the argument unchanged.

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

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#### 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 Fwhere F: Future,

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

The output that the future will produce on completion.
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#### type IntoFuture = F

Which kind of future are we turning this into?
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#### fn into_future(self) -> <F as IntoFuture>::IntoFuture

Creates a future from a value. Read more
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### impl<T, U> TryFrom<U> for Twhere U: Into<T>,

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#### type Error = Infallible

The type returned in the event of a conversion error.
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#### fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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### impl<T, U> TryInto<U> for Twhere U: TryFrom<T>,

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

The type returned in the event of a conversion error.
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#### fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.