Struct SlotId 

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

Stable handle into a SlotArena.

A lightweight identifier (wrapping a usize index) that provides O(1) access to arena slots. Handles remain valid until the slot is removed; after removal, the index may be reused by a later insert.

Stability

Unlike raw indices or pointers, SlotId values are semantically tied to the slot they reference. Accessing a removed slot returns None rather than causing undefined behavior.

Example

use cachekit::ds::SlotArena;

let mut arena = SlotArena::new();
let id = arena.insert(42);

// SlotId provides O(1) access
assert_eq!(arena.get(id), Some(&42));

// Inspect raw index for debugging
println!("Value stored at index {}", id.index());

// After removal, same index may be reused
arena.remove(id);
let new_id = arena.insert(100);
assert_eq!(id.index(), new_id.index());

Implementations

impl SlotId

pub fn index(self) -> usize

Returns the underlying slot index.

Useful for debugging, logging, or custom data structures that need to work with raw indices.

Trait Implementations

impl Clone for SlotId

fn clone(&self) -> SlotId

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for SlotId

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

Formats the value using the given formatter.

impl Hash for SlotId

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 SlotId

fn eq(&self, other: &SlotId) -> 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 Copy for SlotId

impl Eq for SlotId

impl StructuralPartialEq for SlotId