Trait enso_prelude::WeakElement [−][src]
pub trait WeakElement { type Strong; fn new(view: &Self::Strong) -> Self; fn view(&self) -> Option<Self::Strong>; fn is_expired(&self) -> bool { ... } fn clone(view: &Self::Strong) -> Self::Strong { ... } }
Expand description
Interface for elements that can be stored in weak hash tables.
This trait applies to the weak version of a reference-counted pointer; it can be used to
convert a weak pointer into a strong pointer and back. For example, the impl for
std::rc::Weak<T>
defines the Strong
associated type as std::rc::Rc<T>
. Then method
new
can be used to downgrade an Rc<T>
to a Weak<T>
, and method view
can be used to
upgrade a Weak<T>
into an Rc<T>
, if it’s still alive. If we think of the weak pointer as
what is stored, then the strong pointer is a temporary view of it.
Associated Types
Required methods
Provided methods
Implementations on Foreign Types
impl<T> WeakElement for Weak<T> where
T: ?Sized,
[src]
impl<T> WeakElement for Weak<T> where
T: ?Sized,
[src]Implementors
impl<T> WeakElement for enso_prelude::Weak<T> where
T: ?Sized,
[src]
impl<T> WeakElement for enso_prelude::Weak<T> where
T: ?Sized,
[src]