Enum OnceState

pub enum OnceState {
    New,
    Poisoned,
    InProgress,
    Done,
}

Current state of a Once.

Variants

New

A closure has not been executed yet

Poisoned

A closure was executed but panicked.

InProgress

A thread is currently executing a closure.

Done

A closure has completed successfully.

Implementations

impl OnceState

pub fn poisoned(self) -> bool

Returns whether the associated Once has been poisoned.

Once an initialization routine for a Once has panicked it will forever indicate to future forced initialization routines that it is poisoned.

pub fn done(self) -> bool

Returns whether the associated Once has successfully executed a closure.

Trait Implementations

impl Clone for OnceState

fn clone(&self) -> OnceState

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for OnceState

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

Formats the value using the given formatter.

impl PartialEq for OnceState

fn eq(&self, other: &OnceState) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Copy for OnceState

impl Eq for OnceState

impl StructuralPartialEq for OnceState

Layout

Note: Most layout information is completely unstable and may even differ between compilations. The only exception is types with certain repr(...) attributes. Please see the Rust Reference's “Type Layout” chapter for details on type layout guarantees.

Size: 1 byte

Size for each variant:

• New: 0 bytes
• Poisoned: 0 bytes
• InProgress: 0 bytes
• Done: 0 bytes