Struct non_std::dependencies::derive_tools::dependencies::parse_display::helpers::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) -> NonZeroUsize where
F: FnOnce() -> NonZeroUsize,
pub fn get_or_init<F>(&self, f: F) -> NonZeroUsize where
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> 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
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
sourceimpl<T> BorrowMut<T> for T where
T: ?Sized,
impl<T> BorrowMut<T> for T where
T: ?Sized,
const: unstable · sourcefn borrow_mut(&mut self) -> &mut T
fn borrow_mut(&mut self) -> &mut T
Mutably borrows from an owned value. Read more
sourceimpl<T> IntoResult<T> for T
impl<T> IntoResult<T> for T
type Err = Infallible
fn into_result(self) -> Result<T, <T as IntoResult<T>>::Err>
sourceimpl<Target, Original> VectorizedInto<Target> for Original where
Target: VectorizedFrom<Original>,
impl<Target, Original> VectorizedInto<Target> for Original where
Target: VectorizedFrom<Original>,
sourcefn vectorized_into(self) -> Target
fn vectorized_into(self) -> Target
Performs the conversion.