pub struct OnceBox<T> { /* private fields */ }
Available on crate features
__ecma
and __utils
only.Expand description
A thread-safe cell which can be written to only once.
Implementations§
§impl<T> OnceBox<T>
impl<T> OnceBox<T>
pub fn get(&self) -> Option<&T>
Available on crate feature ecma_ast
only.
pub fn get(&self) -> Option<&T>
ecma_ast
only.Gets a reference to the underlying value.
pub fn set(&self, value: Box<T>) -> Result<(), Box<T>>
Available on crate feature ecma_ast
only.
pub fn set(&self, value: Box<T>) -> Result<(), Box<T>>
ecma_ast
only.Sets the contents of this cell to value
.
Returns Ok(())
if the cell was empty and Err(value)
if it was
full.
pub fn get_or_init<F>(&self, f: F) -> &T
Available on crate feature ecma_ast
only.
pub fn get_or_init<F>(&self, f: F) -> &T
ecma_ast
only.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<&T, E>
Available on crate feature ecma_ast
only.
pub fn get_or_try_init<F, E>(&self, f: F) -> Result<&T, E>
ecma_ast
only.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§
Auto Trait Implementations§
impl<T> !Freeze for OnceBox<T>
impl<T> RefUnwindSafe for OnceBox<T>where
T: RefUnwindSafe,
impl<T> Send for OnceBox<T>where
T: Send,
impl<T> Unpin for OnceBox<T>
impl<T> UnwindSafe for OnceBox<T>where
T: RefUnwindSafe + UnwindSafe,
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impl<T> ArchivePointee for T
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Converts some archived metadata to the pointer metadata for itself.
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Deserializes using the given deserializer
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