Struct HeapId 

pub struct HeapId(/* private fields */);

The identity of the heap that owns an allocation.

Every Heap mints one at construction (and a fresh one at reset), and every header it allocates carries it. That makes “is this object mine?” an O(1) test the collector can run before it dereferences anything the header points at — which is what lets Heap::mark reject a root belonging to another heap, or a header the sweep has already poisoned.

NonZeroU32 because 0 is reserved as the poisoned/unowned encoding in the header’s heap_id field.

Implementations

impl HeapId

pub const fn get(self) -> u32

The raw value stored in a header. Never 0.

Trait Implementations

impl Clone for HeapId

fn clone(&self) -> HeapId

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for HeapId

impl Debug for HeapId

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

Formats the value using the given formatter.

impl Eq for HeapId

impl Hash for HeapId

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 PartialEq for HeapId

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for HeapId