pub struct OnceCell<T>(/* private fields */);
__ecma
and __utils
only.Expand description
A thread-safe cell which can be written to only once.
OnceCell
provides &
references to the contents without RAII guards.
Reading a non-None
value out of OnceCell
establishes a
happens-before relationship with a corresponding write. For example, if
thread A initializes the cell with get_or_init(f)
, and thread B
subsequently reads the result of this call, B also observes all the side
effects of f
.
§Example
use once_cell::sync::OnceCell;
static CELL: OnceCell<String> = OnceCell::new();
assert!(CELL.get().is_none());
std::thread::spawn(|| {
let value: &String = CELL.get_or_init(|| {
"Hello, World!".to_string()
});
assert_eq!(value, "Hello, World!");
}).join().unwrap();
let value: Option<&String> = CELL.get();
assert!(value.is_some());
assert_eq!(value.unwrap().as_str(), "Hello, World!");
Implementations§
§impl<T> OnceCell<T>
impl<T> OnceCell<T>
pub const fn with_value(value: T) -> OnceCell<T>
Available on crate feature ecma_ast
only.
pub const fn with_value(value: T) -> OnceCell<T>
ecma_ast
only.Creates a new initialized cell.
pub fn get(&self) -> Option<&T>
Available on crate feature ecma_ast
only.
pub fn get(&self) -> Option<&T>
ecma_ast
only.Gets the reference to the underlying value.
Returns None
if the cell is empty, or being initialized. This
method never blocks.
pub fn wait(&self) -> &T
Available on crate feature ecma_ast
only.
pub fn wait(&self) -> &T
ecma_ast
only.Gets the reference to the underlying value, blocking the current thread until it is set.
use once_cell::sync::OnceCell;
let mut cell = std::sync::Arc::new(OnceCell::new());
let t = std::thread::spawn({
let cell = std::sync::Arc::clone(&cell);
move || cell.set(92).unwrap()
});
// Returns immediately, but might return None.
let _value_or_none = cell.get();
// Will return 92, but might block until the other thread does `.set`.
let value: &u32 = cell.wait();
assert_eq!(*value, 92);
t.join().unwrap();
pub fn get_mut(&mut self) -> Option<&mut T>
Available on crate feature ecma_ast
only.
pub fn get_mut(&mut self) -> Option<&mut T>
ecma_ast
only.Gets the mutable reference to the underlying value.
Returns None
if the cell is empty.
This method is allowed to violate the invariant of writing to a OnceCell
at most once because it requires &mut
access to self
. As with all
interior mutability, &mut
access permits arbitrary modification:
use once_cell::sync::OnceCell;
let mut cell: OnceCell<u32> = OnceCell::new();
cell.set(92).unwrap();
cell = OnceCell::new();
pub unsafe fn get_unchecked(&self) -> &T
Available on crate feature ecma_ast
only.
pub unsafe fn get_unchecked(&self) -> &T
ecma_ast
only.Get the reference to the underlying value, without checking if the cell is initialized.
§Safety
Caller must ensure that the cell is in initialized state, and that the contents are acquired by (synchronized to) this thread.
pub fn set(&self, value: T) -> Result<(), T>
Available on crate feature ecma_ast
only.
pub fn set(&self, value: T) -> Result<(), T>
ecma_ast
only.Sets the contents of this cell to value
.
Returns Ok(())
if the cell was empty and Err(value)
if it was
full.
§Example
use once_cell::sync::OnceCell;
static CELL: OnceCell<i32> = OnceCell::new();
fn main() {
assert!(CELL.get().is_none());
std::thread::spawn(|| {
assert_eq!(CELL.set(92), Ok(()));
}).join().unwrap();
assert_eq!(CELL.set(62), Err(62));
assert_eq!(CELL.get(), Some(&92));
}
pub fn try_insert(&self, value: T) -> Result<&T, (&T, T)>
Available on crate feature ecma_ast
only.
pub fn try_insert(&self, value: T) -> Result<&T, (&T, T)>
ecma_ast
only.pub fn get_or_init<F>(&self, f: F) -> &Twhere
F: FnOnce() -> T,
Available on crate feature ecma_ast
only.
pub fn get_or_init<F>(&self, f: F) -> &Twhere
F: FnOnce() -> T,
ecma_ast
only.Gets the contents of the cell, initializing it with f
if the cell
was empty.
Many threads may call get_or_init
concurrently with different
initializing functions, but it is guaranteed that only one function
will be executed.
§Panics
If f
panics, the panic is propagated to the caller, and the cell
remains uninitialized.
It is an error to reentrantly initialize the cell from f
. The
exact outcome is unspecified. Current implementation deadlocks, but
this may be changed to a panic in the future.
§Example
use once_cell::sync::OnceCell;
let cell = OnceCell::new();
let value = cell.get_or_init(|| 92);
assert_eq!(value, &92);
let value = cell.get_or_init(|| unreachable!());
assert_eq!(value, &92);
pub fn get_or_try_init<F, E>(&self, f: F) -> Result<&T, E>
Available on crate feature ecma_ast
only.
pub fn get_or_try_init<F, E>(&self, f: F) -> Result<&T, E>
ecma_ast
only.Gets the contents of the cell, initializing it with f
if
the cell was empty. If the cell was empty and f
failed, an
error is returned.
§Panics
If f
panics, the panic is propagated to the caller, and
the cell remains uninitialized.
It is an error to reentrantly initialize the cell from f
.
The exact outcome is unspecified. Current implementation
deadlocks, but this may be changed to a panic in the future.
§Example
use once_cell::sync::OnceCell;
let cell = OnceCell::new();
assert_eq!(cell.get_or_try_init(|| Err(())), Err(()));
assert!(cell.get().is_none());
let value = cell.get_or_try_init(|| -> Result<i32, ()> {
Ok(92)
});
assert_eq!(value, Ok(&92));
assert_eq!(cell.get(), Some(&92))
pub fn take(&mut self) -> Option<T>
Available on crate feature ecma_ast
only.
pub fn take(&mut self) -> Option<T>
ecma_ast
only.Takes the value out of this OnceCell
, moving it back to an uninitialized state.
Has no effect and returns None
if the OnceCell
hasn’t been initialized.
§Examples
use once_cell::sync::OnceCell;
let mut cell: OnceCell<String> = OnceCell::new();
assert_eq!(cell.take(), None);
let mut cell = OnceCell::new();
cell.set("hello".to_string()).unwrap();
assert_eq!(cell.take(), Some("hello".to_string()));
assert_eq!(cell.get(), None);
This method is allowed to violate the invariant of writing to a OnceCell
at most once because it requires &mut
access to self
. As with all
interior mutability, &mut
access permits arbitrary modification:
use once_cell::sync::OnceCell;
let mut cell: OnceCell<u32> = OnceCell::new();
cell.set(92).unwrap();
cell = OnceCell::new();
pub fn into_inner(self) -> Option<T>
Available on crate feature ecma_ast
only.
pub fn into_inner(self) -> Option<T>
ecma_ast
only.Consumes the OnceCell
, returning the wrapped value. Returns
None
if the cell was empty.
§Examples
use once_cell::sync::OnceCell;
let cell: OnceCell<String> = OnceCell::new();
assert_eq!(cell.into_inner(), None);
let cell = OnceCell::new();
cell.set("hello".to_string()).unwrap();
assert_eq!(cell.into_inner(), Some("hello".to_string()));
Trait Implementations§
§impl<T> PartialEq for OnceCell<T>where
T: PartialEq,
impl<T> PartialEq for OnceCell<T>where
T: PartialEq,
impl<T> Eq for OnceCell<T>where
T: Eq,
Auto Trait Implementations§
impl<T> !Freeze for OnceCell<T>
impl<T> RefUnwindSafe for OnceCell<T>where
T: RefUnwindSafe + UnwindSafe,
impl<T> Send for OnceCell<T>where
T: Send,
impl<T> Sync for OnceCell<T>
impl<T> Unpin for OnceCell<T>where
T: Unpin,
impl<T> UnwindSafe for OnceCell<T>where
T: UnwindSafe,
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builds.§fn tap_ref_mut_dbg<R>(self, func: impl FnOnce(&mut R)) -> Self
fn tap_ref_mut_dbg<R>(self, func: impl FnOnce(&mut R)) -> Self
.tap_ref_mut()
only in debug builds, and is erased in release
builds.§fn tap_deref_dbg<T>(self, func: impl FnOnce(&T)) -> Self
fn tap_deref_dbg<T>(self, func: impl FnOnce(&T)) -> Self
.tap_deref()
only in debug builds, and is erased in release
builds.