Struct futures_util::future::Lazy

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#[must_use = "futures do nothing unless polled"]
pub struct Lazy<F> { /* fields omitted */ }

[−] Expand description

A future which, when polled, invokes a closure and yields its result.

This is created by the lazy() function.

Trait Implementations

impl<F: Debug> Debug for Lazy<F>

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

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Formats the value using the given formatter.

impl<F> Unpin for Lazy<F>

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

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type Output = R

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

futures in libcore are unstable

The result of the Future.

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

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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.