Struct caffe2_imports::OnceState
1.51.0 · source · pub struct OnceState { /* private fields */ }
Expand description
State yielded to Once::call_once_force()
’s closure parameter. The state
can be used to query the poison status of the Once
.
Implementations§
source§impl OnceState
impl OnceState
sourcepub fn is_poisoned(&self) -> bool
pub fn is_poisoned(&self) -> bool
Returns true
if the associated Once
was poisoned prior to the
invocation of the closure passed to Once::call_once_force()
.
Examples
A poisoned Once
:
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.is_poisoned());
});
An unpoisoned Once
:
use std::sync::Once;
static INIT: Once = Once::new();
INIT.call_once_force(|state| {
assert!(!state.is_poisoned());
});
Trait Implementations§
Auto Trait Implementations§
impl !RefUnwindSafe for OnceState
impl Send for OnceState
impl !Sync for OnceState
impl Unpin for OnceState
impl UnwindSafe for OnceState
Blanket Implementations§
§impl<T> Pointable for T
impl<T> Pointable for T
§impl<SS, SP> SupersetOf<SS> for SPwhere
SS: SubsetOf<SP>,
impl<SS, SP> SupersetOf<SS> for SPwhere SS: SubsetOf<SP>,
§fn to_subset(&self) -> Option<SS>
fn to_subset(&self) -> Option<SS>
The inverse inclusion map: attempts to construct
self
from the equivalent element of its
superset. Read more§fn is_in_subset(&self) -> bool
fn is_in_subset(&self) -> bool
Checks if
self
is actually part of its subset T
(and can be converted to it).§fn to_subset_unchecked(&self) -> SS
fn to_subset_unchecked(&self) -> SS
Use with care! Same as
self.to_subset
but without any property checks. Always succeeds.§fn from_subset(element: &SS) -> SP
fn from_subset(element: &SS) -> SP
The inclusion map: converts
self
to the equivalent element of its superset.