Enum WeakValue 

pub enum WeakValue {
    Reference(Weak<dyn AnyValue>),
    Object(WeakRef<FerroObject>, TypeId),
    Value(BoxedValue),
}

A reference to a binding source that does not keep it alive.

Objects of the class hierarchy and registered reference (model) types are held weakly, as the managed implementation holds every source. Plain values (numbers, strings, value structs) own nothing that could form a cycle and exist only as the transient box that carries them, so they are held by value.

Variants

Reference(Weak<dyn AnyValue>)

A shared model object.

Object(WeakRef<FerroObject>, TypeId)

An object of the class hierarchy and the handle type it was seen as.

Value(BoxedValue)

A plain value.

Implementations

impl WeakValue

pub fn new(value: &BoxedValue) -> Self

pub fn upgrade(&self) -> Option<BoxedValue>

The source, if it is still alive.

Trait Implementations

impl Clone for WeakValue

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl PartialEq for WeakValue

Two references are equal when they refer to the same source: the same object for the weakly held ones, equal values for plain values.

fn eq(&self, other: &Self) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.