Struct ArcIntern

pub struct ArcIntern<T: Eq + Hash + Send + Sync + 'static + ?Sized> { /* private fields */ }

A pointer to a reference-counted interned object.

The interned object will be held in memory only until its reference count reaches zero.

Example

use arc_interner::ArcIntern;

let x = ArcIntern::new("hello");
let y = ArcIntern::new("world");
assert_ne!(x, y);
assert_eq!(x, ArcIntern::new("hello"));
assert_eq!(*x, "hello"); // dereference an ArcIntern like a pointer

Implementations

impl<T: Eq + Hash + Send + Sync + 'static + ?Sized> ArcIntern<T>

pub fn num_objects_interned() -> usize

See how many objects have been interned. This may be helpful in analyzing memory use.

pub fn refcount(&self) -> usize

Return the number of references for this value.

impl<T: Eq + Hash + Send + Sync + 'static> ArcIntern<T>

pub fn new(val: T) -> ArcIntern<T>

Intern a value. If this value has not previously been interned, then new will allocate a spot for the value on the heap. Otherwise, it will return a pointer to the object previously allocated.

Note that ArcIntern::new is a bit slow, since it needs to check a DashMap which contains its own mutexes.

Trait Implementations

impl<T: Send + Sync + Hash + Eq + ?Sized> AsRef<T> for ArcIntern<T>

fn as_ref(&self) -> &T

Converts this type into a shared reference of the (usually inferred) input type.

impl<T: Eq + Hash + Send + Sync + ?Sized> Borrow<T> for ArcIntern<T>

fn borrow(&self) -> &T

Immutably borrows from an owned value.

impl<T: Eq + Hash + Send + Sync + 'static + ?Sized> Clone for ArcIntern<T>

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl<T: Debug + Eq + Hash + Send + Sync + 'static + ?Sized> Debug for ArcIntern<T>

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

Formats the value using the given formatter.

impl<T: Eq + Hash + Send + Sync + Default + 'static + ?Sized> Default for ArcIntern<T>

fn default() -> ArcIntern<T>

Returns the “default value” for a type.

impl<T: Eq + Hash + Send + Sync + ?Sized> Deref for ArcIntern<T>

type Target = T

The resulting type after dereferencing.

fn deref(&self) -> &T

Dereferences the value.

impl<'de, T: Eq + Hash + Send + Sync + 'static + ?Sized + Deserialize<'de>> Deserialize<'de> for ArcIntern<T>

fn deserialize<D: Deserializer<'de>>(deserializer: D) -> Result<Self, D::Error>

Deserialize this value from the given Serde deserializer.

impl<T: Eq + Hash + Send + Sync + Display + ?Sized> Display for ArcIntern<T>

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

Formats the value using the given formatter.

impl<T: Eq + Hash + Send + Sync + ?Sized> Drop for ArcIntern<T>

fn drop(&mut self)

Executes the destructor for this type.

impl<'a, T> From<&'a T> for ArcIntern<T>

where T: Eq + Hash + Send + Sync + 'static + ?Sized, Arc<T>: From<&'a T>,

fn from(t: &'a T) -> Self

Converts to this type from the input type.

impl<T: Eq + Hash + Send + Sync + 'static + ?Sized> From<Box<T>> for ArcIntern<T>

fn from(b: Box<T>) -> Self

Converts to this type from the input type.

impl<T: Eq + Hash + Send + Sync + 'static> From<T> for ArcIntern<T>

fn from(t: T) -> Self

Converts to this type from the input type.

impl<T: Eq + Hash + Send + Sync + ?Sized> Hash for ArcIntern<T>

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<T: Eq + Hash + Send + Sync + Ord + ?Sized> Ord for ArcIntern<T>

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<T: Eq + Hash + Send + Sync + ?Sized> PartialEq for ArcIntern<T>

Efficiently compares two interned values by comparing their pointers.

fn eq(&self, other: &ArcIntern<T>) -> 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<T: Eq + Hash + Send + Sync + PartialOrd + ?Sized> PartialOrd for ArcIntern<T>

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: &Self) -> bool

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

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

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

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

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

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

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

impl<T: Eq + Hash + Send + Sync + Serialize + ?Sized> Serialize for ArcIntern<T>

fn serialize<S: Serializer>(&self, serializer: S) -> Result<S::Ok, S::Error>

Serialize this value into the given Serde serializer.

impl<T: Eq + Hash + Send + Sync + ?Sized> Eq for ArcIntern<T>