Struct once_cell::race::OnceBool[][src]

pub struct OnceBool { /* fields omitted */ }

A thread-safe cell which can be written to only once.

Implementations

impl OnceBool[src]

pub const fn new() -> OnceBool[src]

Creates a new empty cell.

pub fn get(&self) -> Option<bool>[src]

Gets the underlying value.

pub fn set(&self, value: bool) -> Result<(), ()>[src]

Sets the contents of this cell to value.

Returns Ok(()) if the cell was empty and Err(()) if it was full.

pub fn get_or_init<F>(&self, f: F) -> bool where
    F: FnOnce() -> bool
[src]

Gets the contents of the cell, initializing it with f if the cell was empty.

If several threads concurrently run get_or_init, more than one f can be called. However, all threads will return the same value, produced by some f.

pub fn get_or_try_init<F, E>(&self, f: F) -> Result<bool, E> where
    F: FnOnce() -> Result<bool, E>, 
[src]

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.

If several threads concurrently run get_or_init, more than one f can be called. However, all threads will return the same value, produced by some f.

Trait Implementations

impl Debug for OnceBool[src]

impl Default for OnceBool[src]

Auto Trait Implementations

impl RefUnwindSafe for OnceBool

impl Send for OnceBool

impl Sync for OnceBool

impl Unpin for OnceBool

impl UnwindSafe for OnceBool

Blanket Implementations

impl<T> Any for T where
    T: 'static + ?Sized
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impl<T> Borrow<T> for T where
    T: ?Sized
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impl<T> BorrowMut<T> for T where
    T: ?Sized
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impl<T> From<T> for T[src]

impl<T, U> Into<U> for T where
    U: From<T>, 
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impl<T, U> TryFrom<U> for T where
    U: Into<T>, 
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type Error = Infallible

The type returned in the event of a conversion error.

impl<T, U> TryInto<U> for T where
    U: TryFrom<T>, 
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type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.