[−][src]Struct std::sync::OnceState
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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pub fn poisoned(&self) -> bool
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Returns true
if 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
Auto Trait Implementations
impl UnwindSafe for OnceState
impl RefUnwindSafe for OnceState
impl Unpin for OnceState
impl Send for OnceState
impl Sync for OnceState
Blanket Implementations
impl<T> From<T> for T
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impl<T, U> TryFrom<U> for T where
U: Into<T>,
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U: Into<T>,
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>
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impl<T, U> Into<U> for T where
U: From<T>,
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U: From<T>,
impl<T, U> TryInto<U> for T where
U: TryFrom<T>,
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U: TryFrom<T>,
type Error = <U as TryFrom<T>>::Error
The type returned in the event of a conversion error.
fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>
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impl<T> Borrow<T> for T where
T: ?Sized,
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T: ?Sized,
impl<T> BorrowMut<T> for T where
T: ?Sized,
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T: ?Sized,
ⓘImportant traits for &'_ mut Ffn borrow_mut(&mut self) -> &mut T
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ⓘImportant traits for &'_ mut F
impl<T> Any for T where
T: 'static + ?Sized,
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T: 'static + ?Sized,