Struct internment::Intern

pub struct Intern<T: 'static + ?Sized> { /* private fields */ }

A pointer to an interned object

An Intern points to an object that has been leaked and may be used in any thread without locking.

Implementations

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

pub fn new(val: T) -> Intern<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 Intern::new is a bit slow, since it needs to check a HashSet protected by a Mutex.

pub fn from_ref<'a, Q: ?Sized + Eq + Hash + 'a>(val: &'a Q) -> Intern<T>where T: Borrow<Q> + From<&'a Q>,

Intern a value from a reference.

If this value has not previously been interned, then new will allocate a spot for the value on the heap and generate that value using T::from(val).

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

pub fn as_ref(self) -> &'static T

Get a long-lived reference to the data pointed to by an Intern, which is never freed from the intern pool.

pub fn num_objects_interned() -> usize

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

Trait Implementations

impl<T: ?Sized> AsRef<T> for Intern<T>

fn as_ref(&self) -> &T

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

impl<T: ?Sized> Clone for Intern<T>

fn clone(&self) -> Self

Returns a copy of the value.

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

Performs copy-assignment from source.

impl<T: Debug + ?Sized> Debug for Intern<T>

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

Formats the value using the given formatter.

impl<T: Eq + Hash + Send + Sync + Default + 'static> Default for Intern<T>

fn default() -> Self

Returns the “default value” for a type.

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

type Target = T

The resulting type after dereferencing.

fn deref(&self) -> &T

Dereferences the value.

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

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

Formats the value using the given formatter.

impl<T: Eq + Hash + Send + Sync + 'static + Copy> From<&[T]> for Intern<[T]>

fn from(val: &[T]) -> Self

Converts to this type from the input type.

impl<T: Eq + Hash + Send + Sync + 'static + Copy, const N: usize> From<&[T; N]> for Intern<[T]>

fn from(val: &[T; N]) -> Self

Converts a [T; N] into a Intern<[T]>

impl From<&CStr> for Intern<CStr>

fn from(val: &CStr) -> Self

Converts to this type from the input type.

impl From<&Path> for Intern<Path>

fn from(val: &Path) -> Self

Converts to this type from the input type.

impl From<&str> for Intern<str>

fn from(val: &str) -> Self

Converts to this type from the input type.

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

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

Converts to this type from the input type.

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

fn from(t: T) -> Self

Converts to this type from the input type.

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

The hash implementation returns the hash of the pointer value, not the hash of the value pointed to. This should be irrelevant, since there is a unique pointer for every value, but it is observable, since you could compare the hash of the pointer with hash of the data itself.

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 Intern<T>

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

This method returns an Ordering between self and other.

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

Compares and returns the maximum of two values.

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

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Selfwhere Self: Sized + PartialOrd<Self>,

Restrict a value to a certain interval.

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

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

This method tests for self and other values to be equal, and is used by ==.

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

This method 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<Intern<T>> for Intern<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

This method tests less than (for self and other) and is used by the < operator.

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

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

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

This method tests greater than (for self and other) and is used by the > operator.

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

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

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

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

Formats the value using the given formatter.

impl<T: Eq + Hash + Send + Sync + Serialize> Serialize for Intern<T>

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

Serialize this value into the given Serde serializer.

impl<T: ?Sized> Copy for Intern<T>

An Intern is Copy, which is unusal for a pointer. This is safe because we never free the data pointed to by an Intern.

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