Struct UniqueRcUninit

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

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

This is a helper for Rc::make_mut() to ensure correct cleanup on panic. It is nearly a duplicate of UniqueRc<MaybeUninit<T>, A> except that it allows T: !Sized, which MaybeUninit does not.

Fields

ptr: NonNull<RcInner<T>>

layout_for_value: Layout

alloc: Option<A>

Implementations

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

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

Allocates a RcInner 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 Rc.

unsafe fn into_rc(self) -> Rc<T, A>

Upgrade this into a normal Rc.

Safety

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

Trait Implementations

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

fn drop(&mut self)

Executes the destructor for this type.