Struct OnceNonZeroUsize
pub struct OnceNonZeroUsize { /* private fields */ }
Available on crate feature
__base
only.Expand description
A thread-safe cell which can be written to only once.
Implementations§
§impl OnceNonZeroUsize
impl OnceNonZeroUsize
pub const fn new() -> OnceNonZeroUsize
Available on crate features __ecma
and ecma_ast
only.
pub const fn new() -> OnceNonZeroUsize
__ecma
and ecma_ast
only.Creates a new empty cell.
pub fn get(&self) -> Option<NonZero<usize>>
Available on crate features __ecma
and ecma_ast
only.
pub fn get(&self) -> Option<NonZero<usize>>
__ecma
and ecma_ast
only.Gets the underlying value.
pub fn set(&self, value: NonZero<usize>) -> Result<(), ()>
Available on crate features __ecma
and ecma_ast
only.
pub fn set(&self, value: NonZero<usize>) -> Result<(), ()>
__ecma
and ecma_ast
only.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) -> NonZero<usize>
Available on crate features __ecma
and ecma_ast
only.
pub fn get_or_init<F>(&self, f: F) -> NonZero<usize>
__ecma
and 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<NonZero<usize>, E>
Available on crate features __ecma
and ecma_ast
only.
pub fn get_or_try_init<F, E>(&self, f: F) -> Result<NonZero<usize>, E>
__ecma
and 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§
§impl Debug for OnceNonZeroUsize
impl Debug for OnceNonZeroUsize
§impl Default for OnceNonZeroUsize
impl Default for OnceNonZeroUsize
§fn default() -> OnceNonZeroUsize
fn default() -> OnceNonZeroUsize
Returns the “default value” for a type. Read more
Auto Trait Implementations§
impl !Freeze for OnceNonZeroUsize
impl RefUnwindSafe for OnceNonZeroUsize
impl Send for OnceNonZeroUsize
impl Sync for OnceNonZeroUsize
impl Unpin for OnceNonZeroUsize
impl UnwindSafe for OnceNonZeroUsize
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