Struct SlotMap 

pub struct SlotMap<'a, T: Pod + FixedLayout> { /* private fields */ }

Fixed-slot map overlaid on a byte slice.

• O(1) insert (into free slot), O(1) remove, O(1) access by SlotKey.
• Generation counters prevent ABA bugs.
• Used for registries, entity systems, order books with stable handles.

Implementations

impl<'a, T: Pod + FixedLayout> SlotMap<'a, T>

pub fn from_bytes(data: &'a mut [u8]) -> Result<Self, ProgramError>

Overlay a SlotMap on a mutable byte slice.

pub fn capacity(&self) -> usize

Maximum capacity (number of slots).

pub fn count(&self) -> usize

Current number of occupied slots.

pub fn insert(&mut self, value: T) -> Result<SlotKey, ProgramError>

Insert a value, returning a SlotKey handle.

Scans for the first free slot. O(capacity) worst case.

pub fn get(&self, key: SlotKey) -> Result<T, ProgramError>

Get a value by key. Returns error if generation doesn’t match.

pub fn remove(&mut self, key: SlotKey) -> Result<T, ProgramError>

Remove a value by key. Bumps the generation counter.

pub const fn required_bytes(capacity: usize) -> usize

Compute the byte size needed for a SlotMap with the given capacity.