Struct ArenaKeyHandle 

pub struct ArenaKeyHandle { /* private fields */ }

An owned key handle that can be stored in DashMap, SkipMap, etc.

Unlike ArenaKey<'a> which borrows from the arena, ArenaKeyHandle owns a copy of the key data. This allows it to be stored in collections without lifetime issues while still being more efficient than Vec<u8> through:

1. Pre-computed hash (avoids rehashing on every lookup)
2. Small-string optimization (inline storage for keys ≤24 bytes)
3. Interned representation for common key patterns

Performance

• Hash: O(1) (pre-computed) vs O(n) for Vec
• Comparison: Short-circuit on length and hash before byte comparison
• Memory: Inline storage for small keys avoids heap allocation

Implementations

impl ArenaKeyHandle

pub fn new(data: &[u8]) -> Self

Create a new key handle from bytes

pub fn from_arena_key(key: &ArenaKey<'_>) -> Self

Create from an ArenaKey (zero-copy when possible)

pub fn as_bytes(&self) -> &[u8]

Get the key as a byte slice

pub fn hash(&self) -> u64

Get the pre-computed hash

pub fn len(&self) -> usize

Get the length of the key

pub fn is_empty(&self) -> bool

Check if key is empty

pub fn is_inline(&self) -> bool

Check if key is stored inline (no heap allocation)

Trait Implementations

impl AsRef<[u8]> for ArenaKeyHandle

fn as_ref(&self) -> &[u8]

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

impl Clone for ArenaKeyHandle

fn clone(&self) -> ArenaKeyHandle

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for ArenaKeyHandle

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

Formats the value using the given formatter.

impl Eq for ArenaKeyHandle

impl From<&[u8]> for ArenaKeyHandle

fn from(data: &[u8]) -> Self

Converts to this type from the input type.

impl From<&str> for ArenaKeyHandle

fn from(s: &str) -> Self

Converts to this type from the input type.

impl From<Vec<u8>> for ArenaKeyHandle

fn from(data: Vec<u8>) -> Self

Converts to this type from the input type.

impl Hash for ArenaKeyHandle

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 Ord for ArenaKeyHandle

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

This method returns an Ordering between self and other.

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

where Self: Sized,

Compares and returns the maximum of two values.

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

where Self: Sized,

Compares and returns the minimum of two values.

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

where Self: Sized,

Restrict a value to a certain interval.

impl PartialEq for ArenaKeyHandle

fn eq(&self, other: &Self) -> 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 PartialOrd for ArenaKeyHandle

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: &Rhs) -> bool

Tests less than (for self and other) and is used by the < operator.

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

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

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

Tests greater than (for self and other) and is used by the > operator.

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

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