Struct once_cell::imp::OnceCell

pub(crate) struct OnceCell<T> {
    queue: AtomicPtr<Waiter>,
    value: UnsafeCell<Option<T>>,
}

Fields

queue: AtomicPtr<Waiter>

value: UnsafeCell<Option<T>>

Implementations

impl<T> OnceCell<T>

pub(crate) const fn new() -> OnceCell<T>

pub(crate) const fn with_value(value: T) -> OnceCell<T>

pub(crate) fn is_initialized(&self) -> bool

Safety: synchronizes with store to value via Release/(Acquire|SeqCst).

pub(crate) fn initialize<F, E>(&self, f: F) -> Result<(), E>

where F: FnOnce() -> Result<T, E>,

Safety: synchronizes with store to value via SeqCst read from state, writes value only once because we never get to INCOMPLETE state after a successful write.

pub(crate) fn wait(&self)

pub(crate) unsafe fn get_unchecked(&self) -> &T

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(crate) fn get_mut(&mut self) -> Option<&mut T>

Gets the mutable reference to the underlying value. Returns None if the cell is empty.

pub(crate) fn into_inner(self) -> Option<T>

Consumes this OnceCell, returning the wrapped value. Returns None if the cell was empty.

Trait Implementations

impl<T: Debug> Debug for OnceCell<T>

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

Formats the value using the given formatter.

impl<T: RefUnwindSafe + UnwindSafe> RefUnwindSafe for OnceCell<T>

impl<T: Send> Send for OnceCell<T>

impl<T: Sync + Send> Sync for OnceCell<T>

impl<T: UnwindSafe> UnwindSafe for OnceCell<T>