Struct Once

pub struct Once { /* private fields */ }

A dependency-tracking wrapper for parking_lot::Once.

Implementations

impl Once

pub const fn new() -> Self

Create a new Once value.

pub fn state(&self) -> OnceState

Returns the current state of this Once.

pub fn call_once(&self, f: impl FnOnce())

This call is considered as “locking this Once” and it participates in dependency tracking as such.

Panics

This method will panic if f panics, poisoning this Once. In addition, this function panics when the lock acquisition order is determined to be inconsistent.

pub fn call_once_force(&self, f: impl FnOnce(OnceState))

Performs the given initialization routine once and only once.

This method is identical to Once::call_once except it ignores poisoning.

Trait Implementations

impl Debug for Once

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

Formats the value using the given formatter.

impl Default for Once

fn default() -> Once

Returns the “default value” for a type.