Struct Intern

Source
pub struct Intern<'a, T: 'a>(/* private fields */);
Expand description

A reference to an interned item.

The main advantage of this type over just an immutable reference is that its pointer is guaranteed to be unique within a single Interner. Therefore comparisons are very cheap.

§Note about hashing

This wrapper implements PartialEq by comparing its inner pointer. In order to keep consistency, the Hash trait is also implemented by hashing the pointer, NOT the inner value. Therefore hashes of the Intern<T> type are different than hashes of the T.

Implementations§

Source§

impl<'a, T> Intern<'a, T>

Source

pub unsafe fn from_raw(ptr: *const T) -> Self

Create a new Intern type from a raw pointer.

§Safety

The caller must guarantee that the pointed value is in fact owned by an Interner which is still in scope (i.e. not dropped) and that the pointer will not be mutated and/or moved.

Trait Implementations§

Source§

impl<'a, T> AsRef<T> for Intern<'a, T>

Source§

fn as_ref(&self) -> &T

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

impl<'a, T> Borrow<T> for Intern<'a, T>

Source§

fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
Source§

impl<'a, T> Clone for Intern<'a, T>

Source§

fn clone(&self) -> Self

Returns a duplicate of the value. Read more
1.0.0 · Source§

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

Performs copy-assignment from source. Read more
Source§

impl<'a, T: Debug> Debug for Intern<'a, T>

Source§

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

Formats the value using the given formatter. Read more
Source§

impl<'a, T> Deref for Intern<'a, T>

Source§

type Target = T

The resulting type after dereferencing.
Source§

fn deref(&self) -> &Self::Target

Dereferences the value.
Source§

impl<'a, T: Display> Display for Intern<'a, T>

Source§

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

Formats the value using the given formatter. Read more
Source§

impl<'a, T> Hash for Intern<'a, T>

To keep consistency with PartialEq, we hash the pointer, not the value

Source§

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

Feeds this value into the given Hasher. Read more
1.3.0 · Source§

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

Feeds a slice of this type into the given Hasher. Read more
Source§

impl<'a, T: Ord> Ord for Intern<'a, T>

Source§

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

This method returns an Ordering between self and other. Read more
1.21.0 · Source§

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

Compares and returns the maximum of two values. Read more
1.21.0 · Source§

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

Compares and returns the minimum of two values. Read more
1.50.0 · Source§

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

Restrict a value to a certain interval. Read more
Source§

impl<'a, T> PartialEq for Intern<'a, T>

Source§

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

Tests for self and other values to be equal, and is used by ==.
1.0.0 · Source§

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

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

impl<'a, T: PartialOrd> PartialOrd for Intern<'a, T>

Source§

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

This method returns an ordering between self and other values if one exists. Read more
1.0.0 · Source§

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

Tests less than (for self and other) and is used by the < operator. Read more
1.0.0 · Source§

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

Tests less than or equal to (for self and other) and is used by the <= operator. Read more
1.0.0 · Source§

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

Tests greater than (for self and other) and is used by the > operator. Read more
1.0.0 · Source§

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

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

impl<'a, T> Copy for Intern<'a, T>

Source§

impl<'a, T> Eq for Intern<'a, T>

Auto Trait Implementations§

§

impl<'a, T> Freeze for Intern<'a, T>

§

impl<'a, T> RefUnwindSafe for Intern<'a, T>
where T: RefUnwindSafe,

§

impl<'a, T> Send for Intern<'a, T>
where T: Sync,

§

impl<'a, T> Sync for Intern<'a, T>
where T: Sync,

§

impl<'a, T> Unpin for Intern<'a, T>

§

impl<'a, T> UnwindSafe for Intern<'a, T>
where T: RefUnwindSafe,

Blanket Implementations§

Source§

impl<T> Any for T
where T: 'static + ?Sized,

Source§

fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
Source§

impl<T> Borrow<T> for T
where T: ?Sized,

Source§

fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
Source§

impl<T> BorrowMut<T> for T
where T: ?Sized,

Source§

fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
Source§

impl<T> CloneToUninit for T
where T: Clone,

Source§

unsafe fn clone_to_uninit(&self, dest: *mut u8)

🔬This is a nightly-only experimental API. (clone_to_uninit)
Performs copy-assignment from self to dest. Read more
Source§

impl<T> From<T> for T

Source§

fn from(t: T) -> T

Returns the argument unchanged.

Source§

impl<T, U> Into<U> for T
where U: From<T>,

Source§

fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

Source§

impl<P, T> Receiver for P
where P: Deref<Target = T> + ?Sized, T: ?Sized,

Source§

type Target = T

🔬This is a nightly-only experimental API. (arbitrary_self_types)
The target type on which the method may be called.
Source§

impl<T> ToOwned for T
where T: Clone,

Source§

type Owned = T

The resulting type after obtaining ownership.
Source§

fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more
Source§

fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. Read more
Source§

impl<T> ToString for T
where T: Display + ?Sized,

Source§

fn to_string(&self) -> String

Converts the given value to a String. Read more
Source§

impl<T, U> TryFrom<U> for T
where U: Into<T>,

Source§

type Error = Infallible

The type returned in the event of a conversion error.
Source§

fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
Source§

impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

Source§

type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
Source§

fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.