Struct DoubleArena 

pub struct DoubleArena<A, B> {
    pub first: Arena<A>,
    pub second: Arena<B>,
}

Two arenas paired together, useful for storing interrelated values.

Allocations in each arena are independent, but the two are kept together for lifetime management.

Fields

first: Arena<A>

The first arena.

second: Arena<B>

The second arena.

Implementations

impl<A, B> DoubleArena<A, B>

pub fn new() -> Self

Create an empty DoubleArena.

pub fn alloc_pair(&mut self, a: A, b: B) -> (Idx<A>, Idx<B>)

Allocate a pair of related values atomically.

Returns (idx_a, idx_b) where idx_a.raw() == idx_b.raw() is NOT guaranteed — the arenas may have different lengths.

pub fn total_len(&self) -> usize

Total allocations across both arenas.

Trait Implementations

impl<A: Debug, B: Debug> Debug for DoubleArena<A, B>

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

Formats the value using the given formatter.

impl<A: Default, B: Default> Default for DoubleArena<A, B>

fn default() -> DoubleArena<A, B>

Returns the “default value” for a type.