Struct WipeOnForkOnceCell

pub struct WipeOnForkOnceCell<T> { /* private fields */ }

use wipe_on_fork::WipeOnForkOnceCell;

let cell = WipeOnForkOnceCell::new();
assert!(cell.get().is_none());

let value: &String = cell.get_or_init(|| {
    "Hello, World!".to_string()
});
assert_eq!(value, "Hello, World!");
assert!(cell.get().is_some());

Implementations

impl<T> WipeOnForkOnceCell<T>

pub const fn new() -> Self

pub fn get(&self) -> Option<&T>

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

pub fn set(&self, value: T) -> Result<(), T>

use wipe_on_fork::WipeOnForkOnceCell;

let cell = WipeOnForkOnceCell::new();
assert!(cell.get().is_none());

assert_eq!(cell.set(92), Ok(()));
assert_eq!(cell.set(62), Err(62));

assert!(cell.get().is_some());

pub fn try_insert(&self, value: T) -> Result<&T, (&T, T)>

use wipe_on_fork::WipeOnForkOnceCell;

let cell = WipeOnForkOnceCell::new();
assert!(cell.get().is_none());

assert_eq!(cell.try_insert(92), Ok(&92));
assert_eq!(cell.try_insert(62), Err((&92, 62)));

assert!(cell.get().is_some());

pub fn get_or_init<F>(&self, f: F) -> &T

where F: FnOnce() -> T,

use wipe_on_fork::WipeOnForkOnceCell;

let cell = WipeOnForkOnceCell::new();
let value = cell.get_or_init(|| 92);
assert_eq!(value, &92);
let value = cell.get_or_init(|| unreachable!());
assert_eq!(value, &92);

pub fn get_or_try_init<F, E>(&self, f: F) -> Result<&T, E>

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

use wipe_on_fork::WipeOnForkOnceCell;

let cell = WipeOnForkOnceCell::new();
assert_eq!(cell.get_or_try_init(|| Err(())), Err(()));
assert!(cell.get().is_none());
let value = cell.get_or_try_init(|| -> Result<i32, ()> {
    Ok(92)
});
assert_eq!(value, Ok(&92));
assert_eq!(cell.get(), Some(&92))

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

use wipe_on_fork::WipeOnForkOnceCell;

let cell: WipeOnForkOnceCell<String> = WipeOnForkOnceCell::new();
assert_eq!(cell.into_inner(), None);

let cell = WipeOnForkOnceCell::new();
cell.set("hello".to_string()).unwrap();
assert_eq!(cell.into_inner(), Some("hello".to_string()));

pub fn take(&mut self) -> Option<T>

use wipe_on_fork::WipeOnForkOnceCell;

let mut cell: WipeOnForkOnceCell<String> = WipeOnForkOnceCell::new();
assert_eq!(cell.take(), None);

let mut cell = WipeOnForkOnceCell::new();
cell.set("hello".to_string()).unwrap();
assert_eq!(cell.take(), Some("hello".to_string()));
assert_eq!(cell.get(), None);

Trait Implementations

impl<T: Clone> Clone for WipeOnForkOnceCell<T>

fn clone(&self) -> WipeOnForkOnceCell<T>

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl<T: Debug> Debug for WipeOnForkOnceCell<T>

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

Formats the value using the given formatter.

impl<T> Default for WipeOnForkOnceCell<T>

fn default() -> Self

Returns the “default value” for a type.

impl<T> From<T> for WipeOnForkOnceCell<T>

fn from(value: T) -> Self

Creates a new OnceCell<T> which already contains the given value.

impl<T: PartialEq> PartialEq for WipeOnForkOnceCell<T>

fn eq(&self, other: &Self) -> 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<T: Eq> Eq for WipeOnForkOnceCell<T>