Struct holochain::prelude::kitsune_p2p::dependencies::kitsune_p2p_types::dependencies::lair_keystore_api::dependencies::once_cell::race::OnceNonZeroUsize
source · pub struct OnceNonZeroUsize { /* private fields */ }
Expand description
A thread-safe cell which can be written to only once.
Implementations§
source§impl OnceNonZeroUsize
impl OnceNonZeroUsize
sourcepub const fn new() -> OnceNonZeroUsize
pub const fn new() -> OnceNonZeroUsize
Creates a new empty cell.
sourcepub fn get(&self) -> Option<NonZeroUsize>
pub fn get(&self) -> Option<NonZeroUsize>
Gets the underlying value.
sourcepub fn set(&self, value: NonZeroUsize) -> Result<(), ()>
pub fn set(&self, value: NonZeroUsize) -> Result<(), ()>
Sets the contents of this cell to value
.
Returns Ok(())
if the cell was empty and Err(())
if it was
full.
sourcepub fn get_or_init<F>(&self, f: F) -> NonZeroUsizewhere
F: FnOnce() -> NonZeroUsize,
pub fn get_or_init<F>(&self, f: F) -> NonZeroUsizewhere
F: FnOnce() -> NonZeroUsize,
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
.
sourcepub fn get_or_try_init<F, E>(&self, f: F) -> Result<NonZeroUsize, E>where
F: FnOnce() -> Result<NonZeroUsize, E>,
pub fn get_or_try_init<F, E>(&self, f: F) -> Result<NonZeroUsize, E>where
F: FnOnce() -> Result<NonZeroUsize, E>,
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§
source§impl Debug for OnceNonZeroUsize
impl Debug for OnceNonZeroUsize
source§impl Default for OnceNonZeroUsize
impl Default for OnceNonZeroUsize
source§fn default() -> OnceNonZeroUsize
fn default() -> OnceNonZeroUsize
Returns the “default value” for a type. Read more
Auto Trait Implementations§
impl RefUnwindSafe for OnceNonZeroUsize
impl Send for OnceNonZeroUsize
impl Sync for OnceNonZeroUsize
impl Unpin for OnceNonZeroUsize
impl UnwindSafe for OnceNonZeroUsize
Blanket Implementations§
§impl<T> Any for Twhere
T: Any + ?Sized,
impl<T> Any for Twhere
T: Any + ?Sized,
§fn type_id_compat(&self) -> TypeId
fn type_id_compat(&self) -> TypeId
TODO: once 1.33.0 is the minimum supported compiler version, remove
Any::type_id_compat and use StdAny::type_id instead.
https://github.com/rust-lang/rust/issues/27745
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impl<T> ArchivePointee for T
§type ArchivedMetadata = ()
type ArchivedMetadata = ()
The archived version of the pointer metadata for this type.
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_: &<T as ArchivePointee>::ArchivedMetadata
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_: &<T as ArchivePointee>::ArchivedMetadata
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Converts some archived metadata to the pointer metadata for itself.
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W: DeserializeWith<F, T, D>,
D: Fallible + ?Sized,
F: ?Sized,
§fn deserialize(
&self,
deserializer: &mut D
) -> Result<With<T, W>, <D as Fallible>::Error>
fn deserialize(
&self,
deserializer: &mut D
) -> Result<With<T, W>, <D as Fallible>::Error>
Deserializes using the given deserializer
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impl<T> Pointable for T
§impl<SS, SP> SupersetOf<SS> for SPwhere
SS: SubsetOf<SP>,
impl<SS, SP> SupersetOf<SS> for SPwhere
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§fn to_subset(&self) -> Option<SS>
fn to_subset(&self) -> Option<SS>
The inverse inclusion map: attempts to construct
self
from the equivalent element of its
superset. Read more§fn is_in_subset(&self) -> bool
fn is_in_subset(&self) -> bool
Checks if
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is actually part of its subset T
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Use with care! Same as
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but without any property checks. Always succeeds.§fn from_subset(element: &SS) -> SP
fn from_subset(element: &SS) -> SP
The inclusion map: converts
self
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upcast ref
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upcast mut ref