[−][src]Struct double_checked_cell::DoubleCheckedCell
A thread-safe lazily initialized cell.
The cell is immutable once it is initialized. See the module-level documentation for more.
Implementations
impl<T> DoubleCheckedCell<T>
[src]
pub const fn new() -> DoubleCheckedCell<T>
[src]
Creates a new uninitialized DoubleCheckedCell
.
Examples
use double_checked_cell::DoubleCheckedCell; let cell = DoubleCheckedCell::<u32>::new(); assert_eq!(cell.get(), None);
pub fn get(&self) -> Option<&T>
[src]
Borrows the value if the cell is initialized.
Examples
use double_checked_cell::DoubleCheckedCell; let cell = DoubleCheckedCell::from("hello"); assert_eq!(cell.get(), Some(&"hello"));
pub fn get_or_init<F>(&self, init: F) -> &T where
F: FnOnce() -> T,
[src]
F: FnOnce() -> T,
Borrows the value if the cell is initialized or initializes it from a closure.
Panics
Panics or deadlocks when trying to access the cell from the initilization closure.
Examples
use double_checked_cell::DoubleCheckedCell; let cell = DoubleCheckedCell::new(); // Initialize the cell. let value = cell.get_or_init(|| 1 + 2); assert_eq!(*value, 3); // The cell is now immutable. let value = cell.get_or_init(|| 42); assert_eq!(*value, 3);
pub fn get_or_try_init<F, E>(&self, init: F) -> Result<&T, E> where
F: FnOnce() -> Result<T, E>,
[src]
F: FnOnce() -> Result<T, E>,
Borrows the value if the cell is initialized or attempts to initialize it from a closure.
Errors
Forwards any error from the closure if the cell is not yet initialized. The cell then remains uninitialized.
Panics
Panics or deadlocks when trying to access the cell from the initilization closure.
Examples
use double_checked_cell::DoubleCheckedCell; let cell = DoubleCheckedCell::new(); let result = cell.get_or_try_init(|| "not an integer".parse()); assert!(result.is_err()); let result = cell.get_or_try_init(|| "42".parse()); assert_eq!(result, Ok(&42)); let result = cell.get_or_try_init(|| "irrelevant".parse()); assert_eq!(result, Ok(&42));
pub fn into_inner(self) -> Option<T>
[src]
Unwraps the value.
Examples
use double_checked_cell::DoubleCheckedCell; let cell = DoubleCheckedCell::from(42); let contents = cell.into_inner(); assert_eq!(contents, Some(42));
Trait Implementations
impl<T: Debug> Debug for DoubleCheckedCell<T>
[src]
impl<T> Default for DoubleCheckedCell<T>
[src]
pub fn default() -> DoubleCheckedCell<T>
[src]
impl<T> From<T> for DoubleCheckedCell<T>
[src]
pub fn from(t: T) -> DoubleCheckedCell<T>
[src]
impl<T: RefUnwindSafe + UnwindSafe> RefUnwindSafe for DoubleCheckedCell<T>
[src]
impl<T: Send + Sync> Sync for DoubleCheckedCell<T>
[src]
impl<T: UnwindSafe> UnwindSafe for DoubleCheckedCell<T>
[src]
Auto Trait Implementations
impl<T> Send for DoubleCheckedCell<T> where
T: Send,
T: Send,
impl<T> Unpin for DoubleCheckedCell<T> where
T: Unpin,
T: Unpin,
Blanket Implementations
impl<T> Any for T where
T: 'static + ?Sized,
[src]
T: 'static + ?Sized,
impl<T> Borrow<T> for T where
T: ?Sized,
[src]
T: ?Sized,
impl<T> BorrowMut<T> for T where
T: ?Sized,
[src]
T: ?Sized,
pub fn borrow_mut(&mut self) -> &mut T
[src]
impl<T> From<!> for T
[src]
impl<T> From<T> for T
[src]
impl<T, U> Into<U> for T where
U: From<T>,
[src]
U: From<T>,
impl<T, U> TryFrom<U> for T where
U: Into<T>,
[src]
U: Into<T>,
type Error = Infallible
The type returned in the event of a conversion error.
pub fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>
[src]
impl<T, U> TryInto<U> for T where
U: TryFrom<T>,
[src]
U: TryFrom<T>,