Struct zellij_utils::consts::SESSION_NAME [−][src]
pub struct SESSION_NAME { /* fields omitted */ }
Methods from Deref<Target = OnceCell<String>>
pub fn get(&self) -> Option<&T>
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pub fn get(&self) -> Option<&T>
[src]Gets the reference to the underlying value.
Returns None
if the cell is empty, or being initialized. This
method never blocks.
pub unsafe fn get_unchecked(&self) -> &T
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pub unsafe fn get_unchecked(&self) -> &T
[src]Get the reference to the underlying value, without checking if the cell is initialized.
Safety
Caller must ensure that the cell is in initialized state, and that the contents are acquired by (synchronized to) this thread.
pub fn set(&self, value: T) -> Result<(), T>
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pub fn set(&self, value: T) -> Result<(), T>
[src]Sets the contents of this cell to value
.
Returns Ok(())
if the cell was empty and Err(value)
if it was
full.
Example
use once_cell::sync::OnceCell; static CELL: OnceCell<i32> = OnceCell::new(); fn main() { assert!(CELL.get().is_none()); std::thread::spawn(|| { assert_eq!(CELL.set(92), Ok(())); }).join().unwrap(); assert_eq!(CELL.set(62), Err(62)); assert_eq!(CELL.get(), Some(&92)); }
pub fn get_or_init<F>(&self, f: F) -> &T where
F: FnOnce() -> T,
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pub fn get_or_init<F>(&self, f: F) -> &T where
F: FnOnce() -> T,
[src]Gets the contents of the cell, initializing it with f
if the cell
was empty.
Many threads may call get_or_init
concurrently with different
initializing functions, but it is guaranteed that only one function
will be executed.
Panics
If f
panics, the panic is propagated to the caller, and the cell
remains uninitialized.
It is an error to reentrantly initialize the cell from f
. The
exact outcome is unspecified. Current implementation deadlocks, but
this may be changed to a panic in the future.
Example
use once_cell::sync::OnceCell; let cell = OnceCell::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>,
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pub fn get_or_try_init<F, E>(&self, f: F) -> Result<&T, E> where
F: FnOnce() -> Result<T, 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.
Panics
If f
panics, the panic is propagated to the caller, and
the cell remains uninitialized.
It is an error to reentrantly initialize the cell from f
.
The exact outcome is unspecified. Current implementation
deadlocks, but this may be changed to a panic in the future.
Example
use once_cell::sync::OnceCell; let cell = OnceCell::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))
Trait Implementations
impl Deref for SESSION_NAME
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impl Deref for SESSION_NAME
[src]impl LazyStatic for SESSION_NAME
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impl LazyStatic for SESSION_NAME
[src]fn initialize(lazy: &Self)
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Auto Trait Implementations
impl RefUnwindSafe for SESSION_NAME
impl Send for SESSION_NAME
impl Sync for SESSION_NAME
impl Unpin for SESSION_NAME
impl UnwindSafe for SESSION_NAME
Blanket Implementations
impl<T> BorrowMut<T> for T where
T: ?Sized,
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impl<T> BorrowMut<T> for T where
T: ?Sized,
[src]pub fn borrow_mut(&mut self) -> &mut T
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pub fn borrow_mut(&mut self) -> &mut T
[src]Mutably borrows from an owned value. Read more
impl<T> Pointable for T
impl<T> Pointable for T