Struct AllocOnce 

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

Owns a bump arena and the single value allocated inside it.

Access the value through Deref/DerefMut (&*guard / &mut *guard). When the guard is dropped it runs the value’s destructor and then frees the arena — unlike a raw bumpalo::Bump::alloc, whose values are never dropped.

Construct one with the alloc_once! macro rather than by hand.

Trait Implementations

impl<T> Deref for AllocOnce<T>

type Target = T

The resulting type after dereferencing.

fn deref(&self) -> &T

Dereferences the value.

impl<T> DerefMut for AllocOnce<T>

fn deref_mut(&mut self) -> &mut T

Mutably dereferences the value.

impl<T> Drop for AllocOnce<T>

fn drop(&mut self)

Executes the destructor for this type.

fn pin_drop(self: Pin<&mut Self>)

🔬This is a nightly-only experimental API. (pin_ergonomics)

Execute the destructor for this type, but different to Drop::drop, it requires self to be pinned.