Struct corundum::prc::VWeak [−][src]
Expand description
VWeak
is a version of Prc
that holds a non-owning reference to the
managed allocation in the volatile heap. The allocation is accessed by
calling promote
on the VWeak
pointer, which returns an
Option
<
Prc
<T>>
.
Since a VWeak
reference does not count towards ownership, it will not
prevent the value stored in the allocation from being dropped, and VWeak
itself makes no guarantees about the value still being present. Thus it may
return None
when promote
d. Note however that a VWeak
reference,
unlike Weak
, does NOT prevent the allocation itself (the backing
store) from being deallocated.
A VWeak
pointer is useful for keeping a temporary reference to the
persistent allocation managed by Prc
without preventing its inner value
from being dropped from … It is also used to
prevent circular references between Prc
pointers, since mutual owning references
would never allow either Prc
to be dropped. For example, a tree could
have strong Prc
pointers from parent nodes to children, and Weak
pointers from children back to their parents.
The typical way to obtain a VWeak
pointer is to call Prc::demote
.
Implementations
Trait Implementations
Auto Trait Implementations
impl<T, A> LooseTxInUnsafe for VWeak<T, A>
Blanket Implementations
Mutably borrows from an owned value. Read more
pub fn vzip(self) -> V