Struct geng::prelude::once_cell::race::OnceNonZeroUsize
pub struct OnceNonZeroUsize { /* private fields */ }
Expand description
A thread-safe cell which can be written to only once.
Implementations§
§impl OnceNonZeroUsize
impl OnceNonZeroUsize
pub const fn new() -> OnceNonZeroUsize
pub const fn new() -> OnceNonZeroUsize
Creates a new empty cell.
pub fn get(&self) -> Option<NonZeroUsize>
pub fn get(&self) -> Option<NonZeroUsize>
Gets the underlying value.
pub 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.
pub 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
.
pub fn get_or_try_init<F, E>(&self, f: F) -> Result<NonZeroUsize, E>
pub fn get_or_try_init<F, E>(&self, f: F) -> 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§
§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 RefUnwindSafe for OnceNonZeroUsize
impl Send for OnceNonZeroUsize
impl Sync for OnceNonZeroUsize
impl Unpin for OnceNonZeroUsize
impl UnwindSafe for OnceNonZeroUsize
Blanket Implementations§
source§impl<T> BorrowMut<T> for Twhere
T: ?Sized,
impl<T> BorrowMut<T> for Twhere
T: ?Sized,
source§fn borrow_mut(&mut self) -> &mut T
fn borrow_mut(&mut self) -> &mut T
Mutably borrows from an owned value. Read more
§impl<T> CompatExt for T
impl<T> CompatExt for T
§impl<T> Downcast for Twhere
T: Any,
impl<T> Downcast for Twhere
T: Any,
§fn into_any(self: Box<T>) -> Box<dyn Any>
fn into_any(self: Box<T>) -> Box<dyn Any>
Convert
Box<dyn Trait>
(where Trait: Downcast
) to Box<dyn Any>
. Box<dyn Any>
can
then be further downcast
into Box<ConcreteType>
where ConcreteType
implements Trait
.§fn into_any_rc(self: Rc<T>) -> Rc<dyn Any>
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Convert
Rc<Trait>
(where Trait: Downcast
) to Rc<Any>
. Rc<Any>
can then be
further downcast
into Rc<ConcreteType>
where ConcreteType
implements Trait
.§fn as_any(&self) -> &(dyn Any + 'static)
fn as_any(&self) -> &(dyn Any + 'static)
Convert
&Trait
(where Trait: Downcast
) to &Any
. This is needed since Rust cannot
generate &Any
’s vtable from &Trait
’s.§fn as_any_mut(&mut self) -> &mut (dyn Any + 'static)
fn as_any_mut(&mut self) -> &mut (dyn Any + 'static)
Convert
&mut Trait
(where Trait: Downcast
) to &Any
. This is needed since Rust cannot
generate &mut Any
’s vtable from &mut Trait
’s.§impl<T> DowncastSync for T
impl<T> DowncastSync for T
§impl<S> FromSample<S> for S
impl<S> FromSample<S> for S
fn from_sample_(s: S) -> S
§impl<T> Instrument for T
impl<T> Instrument for T
§fn instrument(self, span: Span) -> Instrumented<Self> ⓘ
fn instrument(self, span: Span) -> Instrumented<Self> ⓘ
§impl<F, T> IntoSample<T> for Fwhere
T: FromSample<F>,
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T: FromSample<F>,
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§impl<T> Pointable for T
impl<T> Pointable for T
source§impl<R, P> ReadPrimitive<R> for P
impl<R, P> ReadPrimitive<R> for P
source§fn read_from_little_endian(read: &mut R) -> Result<Self, Error>
fn read_from_little_endian(read: &mut R) -> Result<Self, Error>
Read this value from the supplied reader. Same as
ReadEndian::read_from_little_endian()
.