Struct UniqueArcUninit

struct UniqueArcUninit<T: ?Sized, A: Allocator> {
    ptr: NonNull<ArcInner<T>>,
    layout_for_value: Layout,
    alloc: Option<A>,
}

A unique owning pointer to an ArcInner that does not imply the contents are initialized, but will deallocate it (without dropping the value) when dropped.

This is a helper for Arc::make_mut() to ensure correct cleanup on panic.

Fields

ptr: NonNull<ArcInner<T>>

layout_for_value: Layout

alloc: Option<A>

Implementations

impl<T: ?Sized, A: Allocator> UniqueArcUninit<T, A>

fn new(for_value: &T, alloc: A) -> UniqueArcUninit<T, A>

Allocates an ArcInner with layout suitable to contain for_value or a clone of it.

fn data_ptr(&mut self) -> *mut T

Returns the pointer to be written into to initialize the Arc.

unsafe fn into_arc(self) -> Arc<T, A>

Upgrade this into a normal Arc.

Safety

The data must have been initialized (by writing to Self::data_ptr()).

Trait Implementations

impl<T: ?Sized, A: Allocator> Drop for UniqueArcUninit<T, A>

fn drop(&mut self)

Executes the destructor for this type.