Struct ScopedArena 

pub struct ScopedArena<T> { /* private fields */ }

An arena that supports checkpointing and rollback.

By saving a checkpoint (the current length), the arena can be rolled back to discard all allocations made after that point.

Implementations

impl<T> ScopedArena<T>

pub fn new() -> Self

Create a new empty scoped arena.

pub fn alloc(&mut self, value: T) -> Idx<T>

Allocate a value.

pub fn get(&self, idx: Idx<T>) -> &T

Get a reference to the value at idx.

pub fn checkpoint(&self) -> u32

Create a checkpoint (the current length).

pub fn rollback(&mut self, checkpoint: u32)

Rollback to a previously saved checkpoint.

All allocations after checkpoint are dropped.

pub fn len(&self) -> usize

Current number of allocated values.

pub fn is_empty(&self) -> bool

Returns true if empty.

Trait Implementations

impl<T: Debug> Debug for ScopedArena<T>

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

Formats the value using the given formatter.

impl<T> Default for ScopedArena<T>

fn default() -> Self

Returns the “default value” for a type.