[][src]Struct std::sync::OnceState

pub struct OnceState { /* fields omitted */ }
🔬 This is a nightly-only experimental API. (once_poison #33577)

State yielded to call_once_force’s closure parameter. The state can be used to query the poison status of the Once.

Methods

impl OnceState
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🔬 This is a nightly-only experimental API. (once_poison #33577)

Returns whether the associated Once was poisoned prior to the invocation of the closure passed to call_once_force.

Examples

A poisoned Once:

#![feature(once_poison)]

use std::sync::Once;
use std::thread;

static INIT: Once = Once::new();

// poison the once
let handle = thread::spawn(|| {
    INIT.call_once(|| panic!());
});
assert!(handle.join().is_err());

INIT.call_once_force(|state| {
    assert!(state.poisoned());
});Run

An unpoisoned Once:

#![feature(once_poison)]

use std::sync::Once;

static INIT: Once = Once::new();

INIT.call_once_force(|state| {
    assert!(!state.poisoned());
});Run

Trait Implementations

impl Debug for OnceState
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Formats the value using the given formatter. Read more

Auto Trait Implementations

impl Send for OnceState

impl Sync for OnceState

Blanket Implementations

impl<T, U> TryFrom for T where
    T: From<U>, 
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🔬 This is a nightly-only experimental API. (try_from #33417)

The type returned in the event of a conversion error.

🔬 This is a nightly-only experimental API. (try_from #33417)

Performs the conversion.

impl<T> From for T
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Performs the conversion.

impl<T, U> TryInto for T where
    U: TryFrom<T>, 
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🔬 This is a nightly-only experimental API. (try_from #33417)

The type returned in the event of a conversion error.

🔬 This is a nightly-only experimental API. (try_from #33417)

Performs the conversion.

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

Performs the conversion.

impl<T> Borrow for T where
    T: ?Sized
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Important traits for &'_ mut I

Immutably borrows from an owned value. Read more

impl<T> BorrowMut for T where
    T: ?Sized
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Important traits for &'_ mut I

Mutably borrows from an owned value. Read more

impl<T> Any for T where
    T: 'static + ?Sized
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🔬 This is a nightly-only experimental API. (get_type_id #27745)

this method will likely be replaced by an associated static

Gets the TypeId of self. Read more