Struct OnceLockBrand 

pub struct OnceLockBrand;

Brand for std::sync::OnceLock.

Trait Implementations

impl Clone for OnceLockBrand

fn clone(&self) -> OnceLockBrand

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for OnceLockBrand

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for OnceLockBrand

fn default() -> OnceLockBrand

Returns the “default value” for a type.

impl Hash for OnceLockBrand

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl Kind0L1T for OnceLockBrand

type Output<A> = OnceLock<A>

impl Once for OnceLockBrand

fn new<A>() -> ApplyOnce<Self, A>

Creates a new, uninitialized OnceLock.

Type Signature

forall a. Once OnceLockBrand => () -> OnceLock a

Returns

A new, empty OnceLock.

Examples

use fp_library::classes::once::Once;
use fp_library::brands::OnceLockBrand;

let cell = <OnceLockBrand as Once>::new::<i32>();
assert_eq!(<OnceLockBrand as Once>::get(&cell), None);

fn get<A>(a: &ApplyOnce<Self, A>) -> Option<&A>

Gets a reference to the value if it has been initialized.

Type Signature

forall a. Once OnceLockBrand => OnceLock a -> Option a

Parameters

• a: The OnceLock.

Returns

A reference to the value, or None if uninitialized.

fn get_mut<A>(a: &mut ApplyOnce<Self, A>) -> Option<&mut A>

Gets a mutable reference to the value if it has been initialized.

Type Signature

forall a. Once OnceLockBrand => OnceLock a -> Option a

Parameters

• a: The OnceLock.

Returns

A mutable reference to the value, or None if uninitialized.

fn set<A>(a: &ApplyOnce<Self, A>, value: A) -> Result<(), A>

Sets the value of the OnceLock.

Returns Ok(()) if the value was set, or Err(value) if the cell was already initialized.

Type Signature

forall a. Once OnceLockBrand => (OnceLock a, a) -> Result<(), a>

Parameters

• a: The OnceLock.
• value: The value to set.

Returns

Ok(()) on success, or Err(value) if already initialized.

fn get_or_init<A, B: FnOnce() -> A>(a: &ApplyOnce<Self, A>, f: B) -> &A

Gets the value, initializing it with the closure f if it is not already initialized.

Type Signature

forall a. Once OnceLockBrand => (OnceLock a, () -> a) -> a

Parameters

• a: The OnceLock.
• f: The initialization function.

Returns

A reference to the value.

fn into_inner<A>(a: ApplyOnce<Self, A>) -> Option<A>

Consumes the OnceLock and returns the value if it has been initialized.

Type Signature

forall a. Once OnceLockBrand => OnceLock a -> Option a

Parameters

• a: The OnceLock.

Returns

The value, or None if uninitialized.

fn take<A>(a: &mut ApplyOnce<Self, A>) -> Option<A>

Takes the value out of the OnceLock, leaving it uninitialized.

Type Signature

forall a. Once OnceLockBrand => OnceLock a -> Option a

Parameters

• a: The OnceLock.

Returns

The value, or None if uninitialized.

type Output<A> = <OnceLockBrand as Kind0L1T>::Output<A>

impl Ord for OnceLockBrand

fn cmp(&self, other: &OnceLockBrand) -> Ordering

This method returns an Ordering between self and other.

fn max(self, other: Self) -> Self

where Self: Sized,

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Self

where Self: Sized,

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Self

where Self: Sized,

Restrict a value to a certain interval.

impl PartialEq for OnceLockBrand

fn eq(&self, other: &OnceLockBrand) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl PartialOrd for OnceLockBrand

fn partial_cmp(&self, other: &OnceLockBrand) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

fn lt(&self, other: &Rhs) -> bool

Tests less than (for self and other) and is used by the < operator.

fn le(&self, other: &Rhs) -> bool

Tests less than or equal to (for self and other) and is used by the <= operator.

fn gt(&self, other: &Rhs) -> bool

Tests greater than (for self and other) and is used by the > operator.

fn ge(&self, other: &Rhs) -> bool

Tests greater than or equal to (for self and other) and is used by the >= operator.

impl Copy for OnceLockBrand

impl Eq for OnceLockBrand

impl StructuralPartialEq for OnceLockBrand