Struct ExprArenaCell 

pub struct ExprArenaCell { /* private fields */ }

Parallel-safe owner used by crate::Expr handles.

Ordinary construction writes the canonical arena. Indexed batch builders temporarily route expression operations to worker-local forks and merge the resulting nodes in deterministic index order.

Implementations

impl ExprArenaCell

pub fn new(arena: ExprArena) -> Self

pub const fn model_id(&self) -> ModelId

pub fn borrow(&self) -> ExprArenaSnapshot<'_>

Take a cheap immutable snapshot of the canonical arena.

The returned value is not a live read lock. Later writes are isolated by copy-on-write and are not visible through this snapshot.

Panics

Panics if an indexed batch is active. Snapshot reads cannot observe a worker-local fork and would otherwise wait on the canonical arena lock held by the batch.

pub fn borrow_mut(&self) -> ExprArenaWriteGuard<'_>

Mutably borrow the canonical expression arena.

Panics

Panics if an indexed batch is active, because its worker-local forks must see a stable canonical snapshot until they are merged, or if this thread already holds a write guard for this arena.

Trait Implementations

impl Debug for ExprArenaCell

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

Formats the value using the given formatter.

impl Default for ExprArenaCell

fn default() -> Self

Returns the “default value” for a type.