Enum UniqueId

pub enum UniqueId {
    MemoryRef(Arc<dyn Any + Send + Sync>),
    Plain(usize),
}

Unique identifier potentially backed by an Arc address to protect against collisions.

Note that a serialization roundtrip will force this to become a UniqueId::Plain variant.

Variants

MemoryRef(Arc<dyn Any + Send + Sync>)

ID that derives from the memory address of an Arc to protect against collisions. Note that it internally stores as a dyn Any to allow it to re-use an existing Arc holding any type.

Plain(usize)

Stores a plain usize. Unlike the MemoryRef variant, there is no internal protection against collisions - this must handled separately.

Note: This repr may also be constructed as the result of a serialization round-trip.

Implementations

impl UniqueId

pub fn to_usize(&self) -> usize

pub fn from_arc<T: Any + Send + Sync>(arc: Arc<T>) -> Self

Use an existing Arc<T> as backing for an ID.

pub fn downcast_arc<T: Any>(self) -> Option<Arc<T>>

Downcasts to a concrete Arc type. Returns None Self is Plain.

Panics

On a debug build, panics if Self is an Arc but does not contain T. On a release build this will instead None.

Trait Implementations

impl Clone for UniqueId

fn clone(&self) -> UniqueId

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for UniqueId

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

Formats the value using the given formatter.

impl Default for UniqueId

fn default() -> Self

Returns the “default value” for a type.

impl Display for UniqueId

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

Formats the value using the given formatter.

impl Hash for UniqueId

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 LowerHex for UniqueId

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

Formats the value using the given formatter.

impl Ord for UniqueId

fn cmp(&self, other: &Self) -> 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 UniqueId

fn eq(&self, other: &Self) -> 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 UniqueId

fn partial_cmp(&self, other: &Self) -> 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 Eq for UniqueId