Struct Once

pub struct Once { /* private fields */ }

Wrapper around std::sync::Once.

Refer to the crate-level documentaiton for the differences between this struct and the one it wraps.

Implementations

impl Once

pub const fn new() -> Self

Create a new Once value.

pub fn call_once<F>(&self, f: F)

where F: FnOnce(),

Wrapper for std::sync::Once::call_once.

Panics

In addition to the panics that Once can cause, this method will panic if calling it introduces a cycle in the lock dependency graph.

pub fn call_once_force<F>(&self, f: F)

where F: FnOnce(&OnceState),

Performs the same operation as call_once except it ignores poisoning.

Panics

This method participates in lock dependency tracking. If acquiring this lock introduces a dependency cycle, this method will panic.

pub fn is_completed(&self) -> bool

Returns true if some call_once has completed successfully.

Trait Implementations

impl Debug for Once

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

Formats the value using the given formatter.