Struct WeakRef 

pub struct WeakRef<'scope, T: ?Sized> { /* private fields */ }

A weak reference obtained from a Scope.

A weak reference cannot be dereferenced directly, but must first be upgraded to a StrongRef with WeakRef::upgrade().

Note, that the lifetime parameter 'scope of a WeakRef<'scope, T> is that of the associated Scope<T>, not whatever &T that the Scope<T> happens to be assigned.

Implementations

impl<'scope, T: ?Sized> WeakRef<'scope, T>

pub fn upgrade(&self) -> Option<StrongRef<'scope, T>>

Upgrade this WeakRef to a StrongRef.

This method returns None unless a value is currently assigned to the associated Scope.

Trait Implementations

impl<'scope, T: Clone + ?Sized> Clone for WeakRef<'scope, T>

fn clone(&self) -> WeakRef<'scope, T>

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl<'scope, T: Debug + ?Sized> Debug for WeakRef<'scope, T>

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.